This part 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.
In this context, this standard gives requirements for:
– contactors associated with overload and/or short-circuit protective devices;
– starters associated with separate short-circuit protective devices and/or with separate short-circuit and integrated overload protective devices;
– contactors or starters combined, under specified conditions, with their own short-circuit protective devices. Such combinations, e.g. combination starters or protected starters are rated as units.
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.
Equipment covered by this standard is as follows.
Modification of 1.1 by adding the following:
This equipment is intended for installation in accordance with CSA C22.1, Canadian Electrical Code (CE Code, Part I), and the US National Electrical Code (NEC), NFPA 70. 1 AC and DC contactors
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.
NOTE For contactors combined with suitable relays and which are intended to provide short-circuit protection, the relevant conditions specified for circuit-breakers (IEC 60947-2) additionally apply.
This standard applies also to the actuators of contactor relays and to the contacts dedicated exclusively to the coil circuit of a contactor.
Contactors or starters with an electronically controlled electromagnet are also covered by this standard.
Modification of 1.1.1 by adding the following:
This standard also applies to manual controllers and combination motor controllers. See Annex DVC for specific requirements.