RVZ-10 (RV-10) indoor AC disconnectors are used for making and breaking, without load, individual sections of medium-voltage networks rated 6 or 10 kV, as well as for earthing de-energized sections by means of fixed earthing blades. Applications:
- Prefabricated transformer substations (KTP);
- Unit switchgear cubicles with single-sided service (KSO);
- Metal-enclosed switchgear (KRU);
- KRUN;
- Mobile prefabricated transformer substations;
- Main distribution boards (MDB);
- Capacitor banks;
- Incoming and distribution panels.
Disconnector range:
- RVZ-10/400 – disconnector rated current 400 A;
- RVZ-10/630 – disconnector rated current 630 A;
- RVZ-10/1000 – disconnector rated current 1000 A;
- RVZ-10/2000 – disconnector rated current 2000 A.
The disconnector is manufactured as a three-pole unit with fixed earthing switches (RVZ-10) or without earthing switches (RV-10). Mechanical interlocking prevents incorrect operations: the earthing switch cannot be closed when the main blades are closed; the main blades cannot be closed when the earthing switch is closed. Rotation of the operating shafts of the main circuit and the earthing switch is manual - via PR manual operating mechanisms. Disconnectors are produced with rated currents up to 2000 A.

Technical data

Purpose and application

RVZ-10 (RV-10) is a three-pole vertical-break (swing-link) switching device that provides a visible isolating gap and ensures safe operational isolation and earthing of medium-voltage networks 6–10 kV. The disconnector is intended for:
• localization and selective outage of individual feeders, busbar sections and connections in KSO/KRU;
• creating maintenance gaps with visual indication of blade position;
• safe connection and testing of standby lines, busbar sectionalizing, isolation of metering and measurement nodes;
• bus-coupler and bus-reserve schemes, as well as switching capacitor banks without load;
• earthing of de-energized sections by built-in fixed earthing blades (for RVZ versions).

Thanks to its modular layout and universal connection dimensions, RVZ-10 series disconnectors fit most standard KSO cubicles (single- or double-sided service), metal-enclosed switchgear KRU/KRUN, and complete substations (fixed and mobile) both at 6 kV and 10 kV. The design is oriented for integration with widely used PR manual mechanisms and three-position schemes “ON - OFF - EARTHED”, which simplifies fleet unification and reduces total cost of ownership.

Operating conditions

Climatic design - U2 according to GOST 15150, for operation in temperate climates indoors with free air access or under a shelter. Location - category 2. The insulation, contact assemblies and support insulators are designed for the specified service and test stresses for switchgear with voltage classes 6 and 10 kV at 50 Hz. Installation is permitted up to 1000 m above sea level without recalculation of insulation levels; for elevations above 1000 m the dielectric requirements are addressed by project documentation (in line with general provisions for MV switching devices). The disconnectors are intended for 50 Hz networks with standardized temperature, humidity and dust levels within the location category, and for operation inside KSO/KRU metal cubicles with natural ventilation. Screwed and pinned joints are protected against self-loosening under vibration, and moving parts are designed for long service without disassembly, subject to periodic maintenance.

Layout and design solutions

The RVZ-10 disconnector is a three-pole assembly on a common welded frame. Each pole includes:
• support (or bushing - in the RVFZ variant) insulators of increased mechanical strength;
• a swinging current-carrying blade made of copper or aluminum alloy with anti-oxidation coating; contact surfaces may be galvanically hardened (e.g., silver-plated) to reduce contact resistance;
• fixed and moving separable contacts with multi-finger spring packs providing stable contact pressure throughout service life;
• main-circuit shaft and earthing-switch shaft (for RVZ) with synchronizing linkage and positive end-position latches;
• mechanical end-stops, position indicators (“ON”, “OFF”, “EARTHED”) with the option to transmit status to the cubicle mimic diagram.

The three-pole unit is mounted on a base (frame) with standardized fixing holes for installation in typical KSO/KRU frameworks. Layout variants allow the earthing switch to be on the separable (fixed) side or on the hinged (moving) side - depending on the connection scheme. The design allows left- or right-hand mechanism placement and compatibility with standard cubicle transmissions. Contact systems are rated for the specified short-time and dynamic withstand currents; contact resistance remains stable due to a self-wiping effect during operation and optimized blade geometry. Multi-point contact sockets and flexible connectors are used at high-current locations.

The PR manual three-position mechanism, installable on the cubicle door, provides:
- “ON” (main blades closed, earthing switch open);
- “OFF” (visible isolation of the main circuit);
- “EARTHED” (main blades open, earthing blade closed).
The kinematics exclude simultaneous closure of the main circuit and the earthing switch. Provision is made for padlocks (up to 3 pcs) for organizational lockout. Position is shown by mechanical indicators and/or by a microswitch for auxiliary signalling to SCADA.

Safety and interlocks

The interlocking system prevents hazardous operations: with the main blades closed it is mechanically impossible to close the earthing switch, and vice versa - with the earthing switch closed the main blades cannot be closed. Mechanical stops prevent incomplete make/break. A visible isolating gap and reliable position latching improve personnel safety during switching and maintenance. The mechanism has holes for padlocks and seals, enabling lockout/tagout as required by work permits. The design withstands short-circuit forces within the rated short-time and peak withstand values; earthing components have thermal and mechanical margins. On request, additional shrouds and barriers can be installed, as well as key interlocks with other apparatus (e.g., a load break switch mechanism) to enforce the required sequence of operations.

Versions and options

The RVZ-10 series includes basic and extended versions for standard cubicles and special applications:
• RV-10 - without earthing switch (main circuit only);
• RVZ-10 - with one fixed earthing switch (on the separable side or on the moving side);
• RVZ-10 (double-earthing version) - per project for special sectionalizing tasks;
• version with bushing insulators (RVFZ analogue) - for applications requiring enhanced wall-through insulation;
• left/right mechanism, extended linkages, versions for various phase spacings;
• remote mechanical position indicators, electrical limit switches, contact for “abnormal” blade position;
• supply with flexible busbars/bus bridges and a set of mounting hardware;
• protective covers for live parts and local shields. Installation and connection

Standards compliance

The design and test requirements are aligned with applicable international and national standards for AC disconnectors and earthing switches. The following standards are taken into account during design and testing:
• IEC 62271-102 - “High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches”;
• IEC 62271-1 - “High-voltage switchgear and controlgear - Part 1: Common specifications”;
• IEC 62271-200 - “Metal-enclosed switchgear for rated voltages above 1 kV” (as applied to the cubicles housing the device);
• GOST R 52726-2007 - “AC disconnectors and earthing switches above 1 kV and their operating mechanisms”;
• GOST 1516.1 - “AC equipment from 3 to 500 kV. Insulation withstand requirements”;
• GOST 15150 - “Climatic design and location categories” (U2).

Scope of supply and documentation

Typical supply set includes: three-pole disconnector on a frame (per agreed configuration), PR manual mechanism with linkages, mounting hardware set, data sheet/form, operation manual, and a set of safety posters/labels (as per project). On request: busbar connection kit (flexible bars, bus bridges), additional shrouds for live parts, position microswitches, mechanical indicators, removable lock-keys. To speed up integration, working design documentation and 3D models in popular formats are available.

Engaging contractors and partnership

We are open to cooperation with manufacturers of electrical equipment, design and installation companies, as well as investors interested in organizing serial production of 6–10 kV disconnectors. We provide preliminary and working documentation packages and technical support for ramp-up: material selection, machining and assembly recommendations, sourcing of cast/forged parts, reference samples. Documentation transfer is accompanied by design-engineer consultations. Adaptation of drawings to your manufacturing capabilities and regulatory requirements is available. We help arrange the cooperation chain: metalworking, electroplating, insulator manufacture, assembly and routine tests. By agreement, we provide personnel training, shop audits and implementation of QC procedures.

Benefits of working with us:

- No need to maintain highly specialized engineering staff - you receive a complete documentation set for the product that can be handled by a mid-level engineer.
- No need to build pilot samples - our experience allows launching serial batches straight into production.
- Working to our documentation - your team will receive guidance on all nuances of manufacturing RVZ-10 disconnectors.
- Support at every stage - from preliminary short-circuit and thermal calculations to routine tests and series quality control. Checklists are provided for mechanism setting, contact pressure adjustment, templates for blade-position checks, and operating instructions.

For additional information on RVZ-10 disconnectors, please contact: inbox@proekt-energo.com

...and, as is well known - an error made at the design stage results in 10× costs in manufacturing and 100× in operation...

PDF - Download technical information on RVZ-10 disconnectors

The RVR-20/8000 and RVRZ-20/8000 indoor disconnectors are intended for isolating and reconnecting de-energized sections of an electric circuit in medium-voltage systems while the installation remains live (no load current), as well as for earthing such sections by means of fixed earthing switches.
By design, the vertical-break type disconnectors are manufactured in single-pole execution.
RVR units are supplied without an earthing switch; RVRZ units are supplied with an earthing switch on either the separable-contact side or the non-separable-contact side.
RVR/RVRZ disconnectors consist of a base frame, support insulators, contact system, pull-rod (operating) insulator and earthing switches. A drive shaft with levers mounted on the frame operates the moving blades. If earthing switches are fitted, one or two additional shafts are provided to operate them, together with a mechanical interlock that prevents closing the earthing switch when the main blades are closed, and vice versa. The insulation set comprises support and operating insulators. The contact system comprises fixed copper contacts and moving copper blades. To reduce opening and closing torque, a contact-pressure relief mechanism is used (cam and latching assemblies). The earthing switches comprise a copper bar fixed to steel uprights welded to the earthing-switch shaft. When the earthing switch is closed the bar enters lamellar contacts mounted on the lower shelves of the fixed main contacts. Contact pressure in the axial and separable main contacts and in the earthing lamellae is provided by springs.
RVR/RVRZ disconnectors are intended for operation in indoor switchgear under the following environmental conditions:
– altitude not exceeding 1000 m;
– maximum ambient temperature +40 °C;
– minimum ambient temperature -45 °C;
– relative humidity 80% at +20 °C.

Technical data

Purpose and application

RVR-20/8000 and RVRZ-20/8000 are high-current, vertical-break disconnectors for 20 kV medium-voltage systems with an exceptionally high rated current up to 8,000 A. They are used to isolate and provide a visible break in busbars and feeders without shutting down the entire switchgear lineup. Typical applications include busbar sectioning in metal-enclosed switchgear (KRU) and gas-insulated switchgear (GIS), transformer incomers/outgoers, bypass and maintenance links at primary substations, high-current auxiliary bus systems in power plants and metallurgical facilities, and busduct nodes in industrial power supply centers.
The disconnectors may be operated under voltage without load current and, when equipped with motor drives and interlocks, provide safe earthing of the isolated sections prior to work. The single-pole design allows flexible arrangement on site: building three-phase groups, bus sectioning, or adding bypass blades.

Service conditions

Designed for indoor installation at electrical stations and substations free from conductive dust, aggressive gases and vapors, in non-hazardous environments. Environmental classification per EN/IEC 60721-3-3 (stationary use at weather-protected locations). Operating ambient temperature from -45 °C to +40 °C; relative humidity up to 80% at +20 °C; installation altitude up to 1000 m above sea level. Seismic capability can be provided by project when installed on appropriate foundations. The degree of protection for live parts is determined by the switchgear/cubicle design; drives and interlocks are typically no less than IP20/IP21. Applicable for use in compartmentalized switchgear cells (KSO), metal-enclosed switchgear at 6–20 kV, and special bays of primary substations with forced ventilation. High current duty requires superior contact quality and cooling: low contact resistance is ensured and permissible temperature rise is calculated considering natural convection and busbar thermal conductivity. For dusty or humid rooms, periodic inspection of bolted joints and torque control per maintenance schedule is recommended.

Layout and construction

The disconnector is built on a welded steel frame with anti-corrosion coating. Support insulators (porcelain or composite) provide high mechanical strength and creepage distance suited to the site pollution level. The moving assembly is a vertical-break copper blade with silver-plated contact surfaces. Blades are rigidly linked to the drive shaft via a lever-cam mechanism that provides a fast break and stable contact pressure in the CLOSED position while reducing the drive torque during operation.

Fixed contacts are multi-lamellar, spring-loaded (copper alloy lamellae with silver coating) for reliable performance at 8,000 A continuous current and short-circuit duties. Busbar connections are via flat copper terminals drilled for standard hardware; flexible copper shunts can be supplied to compensate thermal expansion. Reduced heating is achieved by enlarged contact areas, optimized blade/lamella geometry and minimizing separable joints in the current path. The contact-pressure relief mechanism (cam/latch) decreases wear and operating effort while maintaining the required pressure in service.

The earthing switch (RVRZ versions) is mounted on the common base and operated by a dedicated shaft. Its copper bar engages lamellar contacts installed on the lower shelves of the main fixed contacts, ensuring low resistance and high making/withstand capability under short-circuit conditions. Shafts of the disconnector and earthing switch are equipped with local position indicators «ON/OFF/EARTHED» and allow mounting of limit switches for SCADA signaling.

The kinematic system is rated for a mechanical endurance of at least 2,000 O–C cycles while maintaining contact pressure and spring integrity. All fasteners are secured against loosening (cotter pins/locking elements). Corrosion protection includes powder-coated frame parts and tin/silver galvanic coatings on current-carrying parts to minimize contact resistance and oxidation.

Safety and interlocking

An independent mechanical interlock is implemented between the main blade and the earthing switch: closing the earthing switch with the disconnector closed is prevented, as is closing the main blades with the earthing switch closed. The interlock is shaft-mounted with positive mechanics and allows sealing/padlocking. For integration into safety schemes, the following are provided:

• electrical interlocks (limit switches with changeover contacts for control circuits);
• key interlocks (on request) to enforce the operating sequence;
• local mechanical indication and provision for duplicate “DANGER - LIVE/EARTHED” tags;
• travel stops and dampers to reduce impact loads.

Versions and options

The base range includes a version without earthing switch (RVR) and a version with earthing switch (RVRZ). Single-pole construction allows configuring three-pole groups using coupling rods and synchronizing shafts. Drives can be manual rotary or motorized with remote control. On request: mirrored earthing-switch location (left/right), terminal kits for various bus widths and flexible shunts, additional auxiliary contacts, and position sensors for SCADA integration.

Materials and endurance

Compliance with standards

Design and testing are oriented to the requirements for medium-voltage switchgear and controlgear:

• IEC 62271-1 - Switchgear and controlgear, common specifications;
• IEC 62271-102 - Alternating-current disconnectors and earthing switches;
• IEC 62271-200 - A.C. metal-enclosed switchgear and controlgear rated 1–52 kV;
• EN/IEC 60721-3-3 - Environmental classification, stationary use at weather-protected locations;
• EN/IEC 60721-3-4 - Environmental classification, stationary use at non-weather-protected locations (if applicable).

Engaging manufacturers and contractors

We are open to cooperation with mechanical plants, switchgear OEMs, installation and service companies. We provide licensable working documentation for manufacturing RVR/RVRZ disconnectors at your facilities, including material specifications and standard process sheets. We assist in organizing production of sub-assemblies (bending and brazing copper bars, lamellar contacts, machining, surface finishing), and in conducting validation and type tests per program and procedures. For investors and developers we offer production localization support, supplier selection, cost modeling and equipment upgrades. For SCADA integrators - drive data sheets, limit-switch interfaces and signaling/control I/O.

Documentation supplied for design and manufacturing

On request we supply: 3D models (Parasolid, STEP), assembly/part drawings and BOMs (DWG/DXF), CAD assemblies for AutoCAD/SolidWorks, lists of purchased items and materials, interlock and kinematics schemes, installation & maintenance manuals, product passports and delivery specifications. Customization to a particular project is available (compartment size, bus width, drive orientation), as well as guided launch of a pilot production batch without building a prototype - based on proven solutions and thermal/electrodynamic calculations.

Benefits of working with us

– No need to maintain a large team of highly specialized engineers - you receive a complete manufacturing package that can be handled by a mid-level engineer.
– No need to build physical prototypes - our experience enables successful launch of serial batches directly from documentation.
– Working to our documentation, your team receives consulting on all nuances of RVR-20 assembly (layout, kinematics, contact-pressure control, interlock adjustment, test preparation).

For additional information on RVR-20/8000 and RVRZ-20/8000 disconnectors, please contact: inbox@proekt-energo.com

... and, as is well known, an error made at the design stage turns into 10× costs in manufacturing and 100× in operation...

PDF - Download technical information for RVR-20/8000; RVRZ-20/8000

RND-35 series visible-break, center-break air-break switches (disconnectors) are intended for operational switching of de-energized 35/36 kV circuits and for earthing/grounding isolated sections when supplied with integrated earthing switches. The kinematics is a horizontal-rotary, center-break design: one or two rotating post insulators turn 90° to produce a clearly visible isolation gap and stable, high contact pressure. Each pole uses a double-column scheme: the blades (moving knives) are mounted on the upper flanges of the post insulators; the separable (female) contact is protected by a hood for reliable operation under icing. Inter-pole synchronization is via adjustable tie-rods; the leading pole connects to the operating mechanism, followers are linked via inter-pole rods. The contact system employs laminated finger contacts with spring pressure, flexible copper braids, and adjustable rods with angle scales for field alignment. Mechanical interlocks “main circuit/earthing switch” are provided, plus auxiliary limit switches for remote status indication “CLOSED/OPEN/EARTHED”.

RND-35 units are supplied in single-, two-, and three-pole configurations. Environmental/service conditions: outdoor AIS application per IEC 62271-1 normal/special service conditions; the equipment is engineered for ambient -60…+40 °C, altitude ≤ 1000 m, wind and icing as specified below (temperatures beyond IEC “normal” are treated as special service conditions by agreement). Standard mechanisms include manual PR-2B and PRG, and a motor-operated PD-14 with remote control and dry contacts. Insulators can be porcelain station-post (IEC) or polymeric/composite with extended creepage distance for polluted/coastal sites. Corrosion protection: hot-dip galvanizing of steel structures and protective finishes on current-carrying interfaces. Typical external conditions: altitude ≤ 1000 m; ambient -60…+40 °C; radial ice up to 10 mm; wind ≤ 40 m/s (no ice) or ≤ 15 m/s (with ice). Permissible terminal mechanical tension from connected conductors up to 500/780 N depending on current rating. Mechanical endurance meets/exceeds the requirements typically applied to IEC 62271-102 disconnectors in the 36/40.5 kV class. In North America, the device corresponds to a visible-break, center-break air-break switch per IEEE nomenclature.

International notes for specifiers: In IEC practice, rated voltage 36 kV (Um = 40.5 kV) aligns with the parameters below; “3-s thermal withstand current” corresponds to I_th(3 s) and “peak dynamic withstand” to I_peak. Selection of external insulation/creepage follows IEC/TS 60815 (pollution levels). For US projects, ratings/application shall be coordinated to IEEE C37.30.1 (and associated guides), in addition to IEC 62271-1/-102.

Technical Data

Explanatory notes: values follow common 36 kV practice per IEC 62271 series. The 3-second thermal withstand applies to short-circuit duty without damage; the peak dynamic value refers to first half-cycle electromagnetic forces. Earthing switch short-time rating (1 s) is for intentional grounding under fault conditions. Terminal mechanical limits consider wind/ice loading and shall be coordinated with conductor tension/span.

Application and Intended Use

RND-35 is an outdoor, line-type disconnector for AIS 35/36 kV switchyards (incoming feeders, line bays, bus section and transfer bus positions, bypass circuits, taps and sectionalizing points, and disconnection of shunt reactors/capacitor banks per local operating rules). The visible isolation gap provides an unambiguous point of isolation for safe work under permit-to-work procedures. With integrated earthing switches (RNDZ variants), crews can establish equipotential earthing without portable grounds.

The mechanical design is optimized for frequent, short-duration operations, withstands electrodynamic forces during short-circuit events, and allows straightforward SCADA/DCS integration via auxiliary limit switches and dry contacts. Important: like all IEC/IEEE disconnectors/air-break switches, RND-35 is not intended to make or break load current; switching of negligible charging or magnetizing current shall follow owner procedures and surge-control measures.

Layout and Construction Features

Each pole is a channel-section steel frame with rotating post insulators on bearing supports, shafts and cranks. Blades are copper bars with laminated, spring-loaded finger contacts; terminals accept strap/tube bus with flexible copper braids. Separable contacts are hooded to shed ice/contamination; OPEN/CLOSED positions are positively defined by stops/latches. Inter-pole rods are field-adjustable, with angle scales on cranks for phase alignment.

Interlocking prevents closing the main circuit with an earthing switch engaged and vice versa. Drive parts can be sealed and fitted with padlocks or captive-key (Castell/Kirk-type) interlocks on request. Joints use long-life lubricants; the maintenance program covers visual checks, torqueing of bolted joints, and insulator cleaning per site pollution level. Steelwork is hot-dip galvanized; current paths use tinned/silvered interfaces as specified.

Types and Configurations (Nomenclature)

Compatible Operating Mechanisms & Kinematics

Safety and Interlocking

Mutual mechanical interlocks exclude simultaneous closing of the main circuit and the earthing switches. A visible-break isolation gap, designated bonding points for protective conductors, and auxiliary limit switches for “CLOSED/OPEN/EARTHED” indication comply with IEC 62271-102 and IEC 62271-1. For North-American practice, interlocking and ratings coordination follow IEEE C37.30.1 (air-break switches).

Versions and Options

• Polarity: single-, two-, or three-pole sets; mechanism mounted left/right of the leading pole.
• Earthing: none (RND) / single-sided (RNDZ.1a/1b/1) / double-sided (RNDZ.2).
• Current ratings: 1000; 2000; 3150 A*; reinforced blades and terminals for high short-circuit duty.
• Insulation: porcelain station-post or polymer/composite with extended creepage sized to IEC/TS 60815 pollution level.
• Sensors/signaling: additional limit switches and microswitches; custom cable glands and terminal plans.
• Other: adapter frames/plates to replace legacy devices without changing bus elevations.

International options: galvanized coatings per ISO 1461, stainless steel fasteners for C5-M atmospheres, surge-arrester brackets, mechanism cubicle heaters (where applicable), and wiring to terminal blocks per IEC/UL practices.

Standards Compliance

• IEC 62271-102:2018 (A.C. disconnectors and earthing switches; EU adoption e.g. BS EN IEC 62271-102:2018+A1:2022).
• IEC 62271-1:2017 + A1:2021 (Common specifications for H.V. switchgear and controlgear).
• IEC/TS 60815-1/-2/-3 (Selection and dimensioning of external insulation & creepage for polluted conditions).
• IEC 60060-1 (High-voltage test techniques - general definitions and test requirements) - dielectric testing philosophy.
• IEEE C37.30.1-2022 (U.S.: Requirements for A.C. high-voltage air switches rated above 1 kV; supersedes older C37.32, C37.34, C37.35).

Note: Where IEC and IEEE practices are both applicable, ratings nomenclature and test sequences are aligned case-by-case during project specification (e.g., I_th(3 s), I_peak, dielectric test levels, pollution class and creepage).

Operational Advantages

• Stable contact pressure and reliable operation under icing thanks to hooded separable contacts and spring-pressed laminated fingers.
• Adjustable kinematics and inter-pole rods enable rapid on-site alignment and commissioning.
• Broad compatibility with common operating mechanisms and SCADA/DCS (dry contacts and limit switches).
• Porcelain or polymer insulation with creepage sized to site pollution level per IEC/TS 60815.

Additional benefits: robust hot-dip galvanized steelwork for long-term corrosion resistance, straightforward visual confirmation of isolation, and simple maintenance (periodic inspection, torque checks, insulator cleaning) that reduces lifecycle cost in AIS yards.

Documentation and Supply

We provide technical proposals and complete manufacturing documentation for series production of RND-35/RNDZ-35: schematics, bills of materials, 3D models (STEP/Parasolid), drawings (*.dwg/*.dxf), process sheets, assembly and adjustment instructions. Deliverables can be adapted to your tooling, bus elevations, and preferred mechanisms/insulators. On request: FAT procedures, routine test reports per IEC 62271-1, signal I/O lists for SCADA integration, and site installation checklists.

RND-35 FAQ (Questions & Answers)

Requests & consultations: inbox@proekt-energo.com

PDF - Download technical information for the RND-35 Disconnector

The RVR-10/8000 and RVRZ-10/8000 indoor disconnectors are robust vertical-break devices for three-phase 6–10 kV systems, designed for off-load switching of individual circuit sections and, for the RVRZ version, for earthing of de-energized sections via integral earthing switches. High thermal and dynamic withstand, a raised rated current of 8,000 A, availability of manual and motor operators, and a comprehensive system of mechanical and electrical interlocks make the RVR(Z)-10/8000 an optimal choice for KRU/KRUN, KSO, MSB, distribution points, and dedicated bus-sectioning cabinets. The design provides a visible isolating gap in the main circuit, enhancing operational safety and maintenance, while the modular architecture allows tailoring to project requirements and specific cubicle envelopes.

Technical data

Application

RVR and RVRZ disconnectors are applied in power supply and distribution tasks including:

• Busbar sectionalizing and redundancy in KRU/KRUN, KSO, MSB and 6–10 kV distribution points.
• Off-load isolation of incomers, feeders and connections with a visible isolating gap and subsequent application of earthing (for RVRZ).
• By-pass and maintenance jumpers at substations; temporary shunting of network sections during planned maintenance.
• Safe separation of bus sections at high bus currents - up to 8,000 A.
• Outfitting capacitor banks, reactor cubicles, communication/metering cabinets, and distribution of industrial process loads.

Typical installations include prefabricated transformer substations (KTP), single-sided service cubicles (KSO), metal-enclosed switchgear (KRU, KRUN), main switchboards (MSB), as well as special-purpose cabinets within indoor substation rooms and plant electrical areas. In standard cells the device can integrate auxiliary contacts, inter-pole synchronization links, and interlocks with adjacent apparatus. The disconnector is designed for long-term operation under intensive duty, including high service currents and short-time overloads.

Service conditions

RVR/RVRZ are manufactured for indoor, weather-protected locations in accordance with EN/IEC 60721-3-3, ensuring reliable operation under the following basic conditions:

• Installation altitude up to 1,000 m above sea level.
• Ambient temperature: -45 °C to +40 °C.
• Relative humidity up to 80% at +20 °C (without condensation).
• Non-hazardous environment free of conductive dust and aggressive chemicals causing accelerated corrosion.
• Mechanical impacts per project specification; permissible operation with vibration from process equipment within typical switchgear limits.

Upon request the design can be adapted for extended conditions: increased seismic resistance, enhanced corrosion protection, low/high temperature versions, and special builds for critical infrastructures with elevated reliability requirements. To minimize dust and moisture effects, follow the cell operation guidelines (ventilation/heating, room dryness, absence of aggressive vapors).

Design and layout

Structurally, the RVR(Z)-10/8000 is a vertical-break, single-pole disconnector installed as three single-pole units on a common baseframe. The poles are operated synchronously through an inter-pole linkage and a drive shaft. The assembly includes:

• Baseframe (plinth) with drive shaft and lever system transmitting torque to the moving blades.
• Support insulators of high mechanical strength carrying the fixed contacts, and a traction insulator isolating the operating linkage from high potential.
• Contact system with copper fixed contacts (optionally with wear-resistant plating) and moving blades featuring spring packs to generate and stabilize contact pressure.
• Contact pressure release mechanism (cam and latching units) to reduce operator effort at end positions and extend contact pair life.
• Earthing switches (RVRZ) - a copper bar on posts linked to the drive shaft; when closed, the bar engages lamellas mounted on the lower shelves of the fixed contacts. Spring elements provide pressure in the lamellar units.
• Visible isolating gap in the main circuit for visual confirmation of disconnection; blade geometry and contact arrangement ensure clear position indication.

For integration in switchgear cubicles, various cable/bus entry directions (top/bottom) and connection options are supported: to rigid busbars, flexible bars, or cable lugs via transition pieces. Contact pads and bolting patterns are coordinated at the design stage to simplify integration into existing terminal zones. Mounting interfaces follow standardized footprints; adjustment features ensure busbar alignment and smooth drive kinematics.

Maintainability is supported by convenient access to adjustment points and inspection of spring units, lamellar contacts, and bearing supports of drive shafts. Extended sets of auxiliary contacts can be fitted for “Closed/Open/Earthed” signalling to SCADA. On request, inter-device links and brackets are supplied for key interlocks with load break switches, vacuum circuit breakers, and door interlocks.

Safety and interlocking

Operational safety and prevention of mal-operations are ensured by multi-layer interlocks:

• Mechanical interlock prevents closing the earthing switch with the main blades closed and vice versa.
• Key interlocks (optional) enforce the process sequence within the cell and adjacent equipment (e.g., “lock–door”, “lock–breaker”, “lock–earthing switch”).
• Electrical interlocks via auxiliary contacts implement logic inhibits in d.c. control schemes.
• Padlocking of handle/shaft in end positions prevents inadvertent operation during work.
• Visible isolating gap and clear blade position indication support visual status control as per electrical safety practices.

Important: the disconnector is not intended to interrupt load current - load switching is performed by appropriate switching devices (load break switch/circuit breaker), after which the disconnector is opened. Following this sequence preserves equipment life and safety.

Versions and options

The base RVR(Z)-10/8000 range is complemented by options to fine-tune the device for a specific task, cubicle, and automation level:

Standards compliance

RVR(Z)-10/8000 disconnectors are designed and manufactured in line with applicable codes and standards. Subject to agreement with the customer, compliance can be ensured with international and national standards relevant to medium-voltage disconnectors and switchgear:

• IEC 62271-102 - Disconnectors and earthing switches.
• IEC 62271-1 - Common specifications for medium-voltage switchgear and controlgear.
• IEC 62271-200 - AC metal-enclosed switchgear and controlgear for indoor installation (for equipment within KRU/KRUN).
• EN/IEC 60721-3-3 - Classification of environmental conditions for stationary use at weather-protected locations (environmental classes for indoor application).
• IEC 61936-1 - Power installations exceeding 1 kV AC (general requirements).
• EN 50522 - Earthing of power installations exceeding 1 kV AC.

Selection criteria and compatibility

When selecting a disconnector for a specific cell, consider bus current loading, available clearances and creepage distances, required interlocks, operator type (local/remote), and integration with the existing SCADA system. For retrofit projects, transition bars and adapters can be supplied to match existing dimensions, along with “remove/install” mounting packages to minimize downtime.

Engaging contractors, OEMs, and investors

We are open to cooperation with manufacturers and private investors interested in organizing production of the RVR-10/8000 and RVRZ-10/8000 disconnectors. We provide process support, typical route cards, guidance on shop equipment (busbar bending/cutting, machining, galvanic/powder-coat areas), and lists of instruments and gauges for incoming and final inspection. Where needed, we involve proven partners for insulators, current-carrying parts, and spring/lamellar blocks and arrange logistics for serial supply. Contract/toll manufacturing under your brand (white label) is available with full documents and test reports for the pilot lot.

Documentation set available for manufacturing RVR-10/8000; RVRZ-10/8000:

– Pre-tender package (questionnaires, specification, schematic diagrams, 2D outline drawings for cell integration, interface lists and connection variants).
– Full production design package for in-house manufacturing: part and assembly drawings, BOMs, purchased-part lists, assembly and kinematic schemes, adjustment schedules, O&M documents (datasheet, operating manual, records).
– 3D models (formats: STEP/Parasolid, SOLIDWORKS, Inventor) and flat patterns for CAM/laser cutting (DXF, DWG).
– Process instructions: route cards, lubrication/adjustment charts, equipment/tooling lists, incoming/in-process/final QC instructions, and type/routine test program & methods.
– If required - adaptation of documentation to your standard cubicles, preferred purchased-parts base and local codes, plus turnkey support for serial ramp-up.

Why work with us

• Faster time-to-market: pilot-lot release without separate prototypes thanks to high unification and proven processes.
• Optimized engineering costs: the documentation set enables production with mid-level engineers backed by our consulting.
• Flexible localization: sourcing aligned to your geography and capabilities to build a resilient supply chain.
• Project integration: tailoring of standard solutions to customer requirements (interlock schemes, extended signalling, layouts for tight envelopes).

For additional information on RVR-10/8000; RVRZ-10/8000 disconnectors, please contact: inbox@proekt-energo.com

PDF - Download technical information for RVR-10/8000; RVRZ-10/8000