BS EN 60947-4-1 Low-voltage switchgear and controlgear. Contactors and motor-starters. Electromechanical contactors and motor-starters
Low-voltage switchgear and controlgear. Contactors and motor-starters. Electromechanical contactors and motor-starters
Publication Date 31 May 2010
Replaces: BS EN 60947-4-1:2001
Amendment January 2013. Amends and replaces BS EN 60947-4-1:2010 which remains current.
BS EN 60947-4-1 sets out:
a) The characteristics of contactors and starters and associated equipment;
b) The conditions applicable to contactors and starters with reference to:
1) Their operation and behaviour,
2) Their dielectric properties,
3) The degrees of protection provided by their enclosures, where applicable,
4) Their construction;
c) The tests intended for confirming that these conditions have been met, and the methods
be adopted for these tests;
d) The information to be given with the equipment or in the manufacturer's literature.
Equipment covered by this standard is as follows.
* AC and DC contactors
* AC motor-starters
* Direct-on-line (full voltage) a.c. starters
* Reduced voltage a.c. starters
* Star-delta starters
* Two-step auto-transformer starters
* Rheostatic rotor starters
BS EN 60947-4-1 applies to equipment whose main contacts are intended to be connected to circuits the rated voltage of which does not exceed 1000 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 9.3.4) forms part of the installation but not necessarily of the contactor or the starter.