Sans 60947-3

[Marie Ota]

Thispart of IEC 60947 applies to the types of equipment listed in 1 and 2 whose main contacts are intended to be connected to circuits the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.

Starters and/or contactors dealt with in this standard are not normally designed to interrupt short-circuit currents. Therefore, suitable short-circuit protection (see 4) forms part of the installation but not necessarily of the contactor or the starter.

For circuit-breakers and fuse-combination units used as short-circuit protective devices in combination starters and in protected starters, the requirements of IEC 60947-2 and IEC 60947-3 respectively apply.

AC and DC contactors intended for closing and opening electric circuits and, if combined with suitable relays (see 2), for protecting these circuits against operating overloads which may occur therein.

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