prSSH EN IEC 60947-4-1:2025

Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters

Scope

IEC 60947-4-1:2023 is applicable to the following equipment:

- electromechanical contactors and starters including motor protective switching devices (MPSD and IMPSD);

- actuators of contactor relays;

- contacts dedicated exclusively to the coil circuit of the contactor or the contactor relay;

- dedicated accessories (e.g. dedicated wiring, dedicated latch accessory);

intended to be connected to distribution circuits, motors circuits and other load circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC.

This fifth edition cancels and replaces the fourth edition published in 2018. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

a) objective in the scope;

b) instantaneous only motor protective switching device IMPSD (3.5.33);

c) kinds of equipment (5.2.1);

d) methods of overload protection of motors (5.2.6);

e) adoption of the AC-7d from IEC 61095:2023 (in 5.4.2);

f) separately mounted overload relay of a starter (in 5.7.3 b));

g) starter and contactor suitable for use downstream to basic drive module (6.1.2 w));

h) reference to IEC TS 63058 for environmental aspects (in 6.4);

i) wiring subject to movement (in 8.1.3);

j) use of voltage transient limiting device (8.1.18);

k) accessible parts subject to temperature limits (in 8.2.2.3);

l) reference to Annex X of IEC 60947-1:2020 for the co-ordination of MPSD with SCPD (8.2.5.4);

m) reference to IEC TR 63216 with different EMC environments (8.3.1);

n) reference to IEC TR 63201 for the embedded software design (8.4);

o) reference to IEC TS 63208 for cybersecurity aspects (8.5);

p) update and completion of the measurement method of the power consumption of the electromagnet (9.3.3.2.1.2);

q) update of Annex C including rational about AC-3e;

r) determination of the critical load current for photovoltaic applications (M.8.7).