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IEC

IEC 60947-4-1:2018/ISH1:2020

(Main)

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

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

Feuille d'interprétation 1 - Appareillage à basse tension - Partie 4-1: Contacteurs et démarreurs de moteurs – Contacteurs et démarreurs électromécaniques

General Information

Status
Published
Publication Date
12-Mar-2020
ICS
29.120.99 - Other electrical accessories
29.130.20 - Low voltage switchgear and controlgear
Technical Committee
SC 121A - Low-voltage switchgear and controlgear
Current Stage
Ref Project

Relations

Revised
IEC 60947-4-1:2018 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
Effective Date
05-Sep-2023
Revised
IEC 60947-4-1:2023 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
Effective Date
05-Sep-2023

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IEC 60947-4-1:2018/ISH1:2020 - Interpretation sheet 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters Released:3/13/2020IEC 60947-4-1:2018/ISH1:2020 - Interpretation sheet 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters Released:3/13/2020
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IEC 60947-4-1:2018/ISH1:2020 - Interpretation sheet 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters Released:3/13/2020
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Standards Content (Sample)


 IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
IEC 60947-4-1
Edition 4.0  2018-10
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 4-1: Contactors and motor-starters –
Electromechanical contactors and motor-starters

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 121A: Low-voltage switchgear
and controlgear, of IEC technical committee 121: Switchgear and controlgear and their
assemblies for low voltage.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
121A/336/DISH 121A/342/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.

___________
Interpretation of the first paragraph of 6.2

The reference to 5.2 of IEC 60947-1:2007, IEC 60947-1:2007/AMD1:2010 is intended to cover
the whole subclause where its first paragraph can be discarded.
In particular, the third paragraph of this Subclause 5.2 requiring the marking on the equipment
of manufacturer's name or trademark and type designation or serial number is covering items
a) and b) of 6.1.1 of IEC 60947-4-1:2018.
n o
and of Table 7
Interpretation of footnotes
The standard making conditions for the utilization category AC-3e are defined by the ratio
o
I / I equal to 12 with the corresponding value of Cos ϕ in footnote .
e
n
Footnote provides the possibility to select an alternate value of the ratio I / I between 12
e
and 13, and gives the corresponding equations to determine the value of Cos ϕ.
ICS 29.120.99; 29.130.20
IEC 60947-4-1:2018-10/ISH1:2020-03(en-fr)

– 2 – IEC 60947-4-1:2018/ISH1:2020

 IEC 2020
Interpretation of the rated operational current of Table 13 and Table 14

Tables 13 and 14 are intended to be used for contactors and starters specified for motor

loads. If the contactor or starter is specified with more than one motor load utilization category

(AC-2, AC-3, AC-3e or AC-4), the rated operational current I corresponding to the utilization
e
category AC-3 is preferred for determining the prospective current “r” for the test.

The utilization category AC-3 is considered as the most representative use case and is

deemed to cover the other motor utilization categories.

 IEC 2020
COMMISSION ÉLECTROTECH
...

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