IEC/EN 60947-2 — Circuit-breakers (LV)
LV circuit-breakers product standard. Industrial breaker selection and discrimination studies.
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Products — switchgear & transformers
IEC/IEEE 62271, 60076, 61439, 60947, C37, C57, DER/BESS product and listing standards.
IEC/EN 60947-3 — Switches, disconnectors, switch-disconnectors and fuse-combination units
LV switches and switch-disconnectors. Isolating devices for boards and machinery.
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IEC/EN 60947-4-1 — Contactors and motor-starters
Electromechanical contactors and motor-starters. MCC design baseline.
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IEC/EN 60947-6-1 — Transfer switching equipment
Automatic transfer switching equipment. Critical for standby generation and dual-supply systems.
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IEC/EN 61439-1 — LV switchgear and controlgear assemblies — General rules
General rules for LV assemblies. Design verification methodology for switchboards.
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IEC/EN 61439-2 — Power switchgear and controlgear assemblies
Power switchgear and controlgear assemblies (PSC). Main standard for power distribution boards.
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UL 1558 / UL 891 / UL 67 — US LV gear listing trio (switchgear/switchboards/panelboards)
Core US listing standards for LV power circuit breaker switchgear, switchboards and panelboards.
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IEC/EN 60099-4 — Metal-oxide surge arresters without gaps for a.c. systems
Gapless metal-oxide surge arresters for AC systems. Dominant HV arrester product standard.
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IEEE C62.11 — Metal-oxide surge arresters for AC power circuits (>1 kV)
US metal-oxide arrester standard for AC power circuits above 1 kV.
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IEC/EN 62271-100 & IEEE C37 dual-spec breaker practice (global projects)
Practice for dual-specifying HV breakers to IEC and IEEE for international projects.
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