BS 5424-3:1988

National foreword
Committees responsible
1 General
2 Definitions
3 Classification
4 Characteristics of contactors
5 Nameplates
6 Standard conditions for operation in service
7 Standard conditions for construction
8 Tests
Appendices
A Information to be given by the user when conditions
    for operation in service differ from the standard
B Clearances and creepage distances for low-voltage
    contactors
C Protection of a contactor by a short-circuit
    protective device
D Conventional test circuit for verification of making
    and breaking capacities for categories AC-1 to AC-4
    and DC-1 to DC-5
AA Impact test apparatus
BB Test series to be carried out and number of samples
    to be submitted for certification purposes

Deals with electro-magnetic air break contactors in accordance with I E C Publication 158-1 for which additional requirements are necessary to specify in enough detail certain testing characteristics and procedures. Included are sections on definitions, classification, characteristics of contactors, nameplates, standard conditions for operation in service and construction, and tests.

First paragraph

Replacement:

This standard applies to electro-magnetic air-break contactors in accordance with IEC Publication 158-1 for which additional requirements are necessary in order to specify in sufficient detail certain testing parameters and procedures.

Additional notes:

1. — The need for additional requirements appears, for example, when contactors have to be tested and certified by appropriate testing authorities because of national or other laws or rules.

2. — If control switches are incorporated in contactors they shall comply with I EC Publication 337-1: Control Switches (Low-voltage Switching Devices for Control and Auxiliary Circuits, Including Contactor Relays), Part 1: General Requirements.