UNE-EN IEC 60947-4-2:2023

This document applies to semiconductor motor controllers and starters which can include a

series mechanical switching device, intended to be connected to circuits the rated voltage of

which does not exceed 1 000 V AC.

This document characterizes semiconductor motor controllers and starters with and without

bypass means.

This document does not apply to:

semiconductor motor controllers and starters used for continuous operation of AC motors

at motor speeds other than the normal speed2;

direct-on-line semiconductor motor controllers rated above 9 A without motor inrush

current limiting function;

electromechanical contactors and external overload relays (see IEC 60947-4-1);

short-circuit protective device associated with semiconductor motor controllers and

starters (see IEC 60947-4-1 (MPSD), IEC 60947-2 and IEC 60947-3);

semiconductor equipment, including semiconductor contactors (3.4.13 of

IEC 60947-1:2019) controlling non-motor loads (see IEC 60947-4-3);

semiconductor motor controllers and starters used for rotor circuits2;

adjustable speed electrical power drive systems (see IEC 61800 series);

use of the product within explosive atmospheres (see IEC 60079 series);

software and firmware requirements2;

NOTE 1 Guidance on embedded software is under development under the reference IEC TR 63201.

cyber security aspects (see IEC 62443 series).

Contactors, overload relays and control circuit devices used in semiconductor motor

controllers and starters should comply with the requirements of their relevant product

standard. Where mechanical switching devices are used, they should meet the requirements

of their own IEC product standard, and the additional requirements of this document.

The object of this document is to state as follows:

the characteristics of semiconductor motor controllers and starters and associated

equipment;

the conditions with which semiconductor motor controllers and starters comply with

reference to

a) their operation and behaviour in normal and abnormal operating conditions including

overcurrent operating conditions;

b) their dielectric properties;

c) the degrees of protection provided by their 363 enclosures where applicable;

d) their construction including safety measures against electric shock, fire hazard and

mechanical hazard;

the tests intended for confirming that these conditions have been met, and the methods to

be adopted for these tests;

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

NOTE 2 For the purpose of this document, the term "controller" is used instead of

"semiconductor motor controller".