Name: IEC 60947-4-1 Ed. 4.0 b PDF - Engineering Standards Download
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IEC 60947-4-1 Ed. 4.0 b – Low-voltage switchgear and controlgear – Part 4-1: Contactors and motor-starters – Electromechanical contactors and motor-starters

IEC 60947-4-1:2018 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 fourth edition cancels and replaces the third edition published in 2009 and its Amendment 1:2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
Scope structure and exclusions
Editorial correction of notes and hanging paragraphs
Reference to IEC 62683-1
Motor protective switching device (MPSD) with its requirements
Safety aspects related to:
General aspects;
Limited energy circuits;
Electronic circuits;
Assessment procedure for electromechanical overload protection used in safety -applications (new Annex L)
Introduction of provisions covering the impact of higher locked rotor current to achieve high efficiency class
Mention of dedicated wiring accessories
Pickup power measurement
Alignment to IEC 60947-1:2007, IEC 60947-1:2007/AMD1:2010, and IEC 60947-1:2007/AMD2:2014
Direct current requirements for covering photovoltaic application (new Annex M)
Load monitoring indicators (new Annex O)
Short-circuit breaking tests of MPSD (new Annex P)
Co-ordination under short-circuit conditions between a MPSD and another short-circuit protective device associated in the same circuit (new Annex Q).