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IEC 60420:1973

IEC 60420:1973

High-voltage alternating current switch-fuse combinations and fuse-circuit-breaker combinations

Combinés interrupteurs-fusibles et combinés disjoncteurs-fusibles à haute tension pour courant alternatif

1973-01-01 /Anulada
Resumen (inglés):
This standard applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches including switch-disconnectors and current-limiting fuses and thus able to interrupt: - any load current up to the rated breaking current of the switch; - any over-current up to the rated short-circuit breaking current of the combination by which automatic interruption is initiated. This standard applies to combinations designed with rated voltages above 1 kV and below 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz.
Resumen (francés):

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