GN19-12 Indoor AC Disconnector (Disconnect Switch)

The GN19-12 indoor alternating-current disconnector is intended for no-load isolation (make/break without load current) of medium-voltage circuits with a maximum equipment voltage up to 12 kV (50/60 Hz). The GN19-12 family comprises three-pole vertical-rotary knife-type devices for metal-enclosed AIS/MV switchgear cubicles. Flat-mount and through-wall (GN19-12C) versions are available to separate the operating handle from the live parts; options include a manual operating mechanism CS6-1 and a “live-presence” indicator.

Purpose and Application

The GN19-12 provides a visible isolating distance for operational switching, scheduled maintenance and repair within 6–10 kV MV switchgear (insulation level up to 12 kV): incoming and bus-section cubicles, busbar compartments, feeder/transformer connections, and distribution substations. The device is used to place de-energized sections in and out of service, strictly without load or short-circuit current, and enables:

operational isolation of the work area - a visible break by the knife blade;
safe access when mechanical interlocks with switchgear doors and the circuit breaker are applied;
inter-section and maintenance switching in standard MV schemes;
integration into SCADA/remote control via auxiliary contacts and limit switches (options).

Extended use cases. GN19-12 serves as a bus or feeder disconnector / disconnect switch in AIS cubicles such as KYN28A-12, XGN2-12 and equivalents where compact size, robust mechanics and direct visual confirmation of isolation are required. In “incoming/tap-off” feeders, bypass lines, transformer/reactor circuits and capacitor banks, the disconnector localizes the work zone, provides galvanic separation, and supports inter-section operations with no load. For enhanced safety, an earthing/grounding switch (e.g., JN15-12) is often installed in the same panel with key interlocks to the operating mechanism to prevent incorrect sequences.

Through-wall version GN19-12C. Used where separation of the operator area and the power compartment is required: handle and position indication on the front, current-carrying parts behind a metal barrier. This increases operational safety, simplifies maintenance and makes visual isolation checks easier.

Industries and geography. Target markets include China, Africa, Asia, Europe and the USA; suitable for 50/60 Hz systems. Typical applications: industrial distribution (mining, metallurgy, oil & gas, data centers), municipal and plant substations, and small/medium generation. “Anti-pollution” and high-altitude versions with increased creepage distances are available for dusty, humid or elevated-site service.

Typical RFQs (for buyers/specifiers): rated current (400/630/1000/1250 A), phase spacing (210/230/250/275 mm), mounting type (standard/through-wall), presence of an operating mechanism, live-presence indicator, compatibility with AIS cubicles and package substations, plus price, lead time, datasheet, drawings (DWG/DXF) and 3D models (STEP/IGES). Common English search terms: “GN19-12 indoor disconnector/isolator 12kV”, “GN19-12C through-wall”, “12kV knife disconnect (no-load)”.

Thanks to its compact mechanics and mounting variants, GN19-12/GN19-12C integrates easily into existing and new cubicles; “anti-pollution” and high-altitude executions are offered for harsh environments. Design and terminology follow IEC practice; for North American projects, coordinate with the applicable IEEE/ANSI C37 series for metal-enclosed switchgear.

Technical Data

Rated voltage, kV	10
Maximum system voltage (Um), kV	12
Rated continuous current, A	400; 630; 1000; 1250
Short-time withstand current (4 s), kA r.m.s.	12.5; 20; 31.5; 40
Peak withstand current (dynamic), kA peak	31.5; 50; 80; 100
Power-frequency withstand (1 min), kV (phase-phase/phase-earth; across open gap)	42 / 48
Typical phase spacing, mm	210; 230; 250; 275
Mechanical endurance (main circuit)	per IEC 62271-102 class M1/M2 (by execution)
Typical switchgear compatibility	AIS cubicles KYN28A-12, XGN2-12 (verify per project)

Values above are typical for the GN19-12 family: 400–1250 A continuous; 12.5–40 kA (4 s) short-time and 31.5–100 kA peak; 1-minute 50/60 Hz withstand 42/48 kV. Exact ratings are confirmed in the delivered datasheet for the selected configuration.

Service Conditions

Location: indoor installation (MV switchgear cubicles, AIS/metal-enclosed).
Ambient temperature: standard -15 °C to +40 °C; low-temperature versions to -25 °C.
Altitude: up to 1000 m (higher altitudes require insulation re-rating/high-altitude execution).
Relative humidity: daily up to 95 %, monthly up to 90 %, without condensation.
Seismic capability: up to 8 degrees (as per manufacturer’s specification).
Atmosphere: non-conductive dust only; free of corrosive gases and excessive vibration per MV switchgear practice.

Ensure cabinet ventilation, manage local heating, maintain minimum clearances and creepage distances, and consider heaters/dehumidifiers where required to preserve dielectric strength, especially in dusty or humid rooms.

Design and Construction

The GN19-12 is a three-pole device on a rigid steel frame featuring: support/bushing insulators (porcelain/epoxy), vertical-rotary knife blades with spring contact pressure, a reinforced contact system with low contact resistance, a link-lever operating train synchronizing all poles, and a manual CS6-1 mechanism (option: limit switches/auxiliary contacts for SCADA/telecontrol). The GN19-12C “through-wall” execution places the handle on the front while the live parts remain behind a partition, improving ergonomics and safety in compact AIS cubicles.

Assembly	Function	Design features
Base frame	Mounting for poles and mechanism	Welded, high rigidity, adjustable mounting holes
Support/bushing insulators	Dielectric insulation & mechanical support	Porcelain or cast epoxy; increased creepage
Knife blades	Visible isolation	Vertical-rotary; spring-assisted contact pressure
Contact system	Reliable current path	Reinforced fingers; wear-resistant plating
CS6-1 operating mechanism	Positions ON/OFF	Options for auxiliary/limit switches

Safety and Interlocks

Safety is achieved by the visible isolating distance, mechanical interlocks with doors and the circuit breaker, and the use of auxiliary/limit switches to provide “OPEN/CLOSED” status and inhibit incorrect operations. In the GN19-12C version, segregating the mechanism from live parts with a metal barrier further reduces operational risk.

Versions and Options

The GN19-12 family offers multiple variants to fit project and cabinet requirements:

GN19-12 (flat mount) and GN19-12C (through-wall mount);
rated currents 400/630/1000/1250 A; phase spacing 210/230/250/275 mm;
left/right handle orientation;
short-time withstand (4 s) 20/25/31.5 kA (up to 40 kA for 1250 A on request);
options: auxiliary switch (ON/OFF), live-presence indicator, anti-pollution and high-altitude executions.

Option sets and compatibility are confirmed at order stage. For commercial requests, specify price, lead time, Incoterms, required drawings/models and switchgear compatibility.

Partnerships and Contractors

We collaborate with electrical equipment manufacturers, MV switchgear integrators, EPC contractors and investors interested in localized production of the GN19-12 series. We offer:

transfer of design packages (from preliminary specs to full production documentation);
adaptation to your manufacturing capabilities (tooling, machining, plating, coating);
sourcing and qualification of suppliers (insulators, stamping/machining, sub-assembly);
support on FAT/SAT procedures, test programs and reporting;
ramp-up assistance, personnel training and commissioning support.

Available Documentation

Available tender documentation (data inquiry sheets, specs, explanatory notes) and a full set of manufacturing documents for your site:

part/assembly drawings (DWG/DXF), BOMs and lists;
3D models (STEP/IGES/Parasolid (x_t), SolidWorks, Inventor);
electrical diagrams, interlock charts, cable lists, SCADA/remote-control schemes;
assembly/adjustment instructions, inspection routes, test programs;
typical O&M documents (datasheet, manual, test forms).

On request, the package is tuned to project needs: busbar thickness, connection interfaces, mechanism type and limit-switch positions, insulator types, phase spacing, etc.

Why Work with Us

- No need for a large in-house engineering team: you get a ready-to-build documentation set.
- Start from serial batches with minimal rework and full technical support.
- Expert guidance on GN19-12 manufacturing and testing, plus assistance with tooling and QA programs.