BS EN IEC 60947-4-1:2019

This standard BS EN IEC 60947-4-1:2019 Low-voltage switchgear and controlgear is classified in these ICS categories:

• 29.130.20 Low voltage switchgear and controlgear
• 29.120.99 Other electrical accessories

This part of IEC 60947 is applicable to the following equipment:

• electromechanical contactors and starters including motor protective switching device (MPSD);

• actuators of contactor relays;

• contacts dedicated exclusively to the coil circuit of this contactor or this 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 document covers also the assessment procedure for electromechanical overload protection used in safety applications such as protecting a motor located in explosive atmosphere from the outside atmosphere: See Annex L.

This document does not apply to:

• starters for DC motors ¹;

  NOTE 1 The requirements for DC motor starters are under consideration for the next maintenance cycle.

• auxiliary contacts of contactors and contacts of contactor relays. These are covered by IEC 60947-5-1;

• starter used downstream to frequency drive1;

  NOTE 2 Additional requirements for starter used downstream to frequency drive are under consideration for the next maintenance cycle.

• short-circuit protective device integrated within starters other than MPSDs. This is covered by IEC 60947-2 and IEC 60947-3;

• the use of the product with additional measure within explosive atmospheres. These are given in IEC 60079 series;

• embedded software design rules¹;

• cyber security aspects. These are covered by IEC 62443 series.

The objective of this document is to state:

1. the characteristics of the equipment;

2. the conditions applicable to the equipment with reference to:

   1. its operation and behaviour,

   2. its dielectric properties,

   3. its degree of protection,

   4. its construction including safety measures against electric shock, fire hazard and mechanical hazard;

3. the tests intended for confirming that these conditions have been met, and the methods to be adopted for these tests;

4. the information to be given with the equipment or in the manufacturer's literature.