AS/NZS 3947.3:2001

1 - AS/NZS 3947.3:2001 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - SWITCHES, DISCONNECTORS, SWITCH-DISCONNECTORS AND FUSE-COMBINATIO
4 - PREFACE
6 - CONTENTS
9 - 1 General
9 - 1.1 Scope and object
10 - 1.2 Normative references
11 - 2 Definitions
12 - 2.1 switch (mechanical)
12 - 2.2 disconnector
12 - 2.3 switch-disconnector
12 - 2.4 fuse-combination unit
12 - 2.5 switch-fuse
12 - 2.6 fuse-switch
12 - 2.7 disconnector-fuse
12 - 2.8 fuse-disconnector
12 - 2.9 switch-disconnector-fuse
13 - 2.10 fuse-switch-disconnector
13 - 2.11 dependent manual operation (of a mechanical switching device)
13 - 2.12 independent manual operation (of a mechanical switching device)
13 - 2.13 semi-independent manual operation
13 - 2.14 stored energy operation (of a mechanical switching device)
14 - 3 Classification
14 - 3.1 According to the utilization category
14 - 3.2 According to the method of operation of manually operated equipment
14 - 3.3 According to suitability for isolation
14 - 3.4 According to the degree of protection provided
15 - 4 Characteristics
15 - 4.1 Summary of characteristics
15 - 4.2 Type of equipment
15 - 4.2.1 Number of poles
15 - 4.2.2 Kind of current
15 - 4.2.3 Number of positions of the main contacts
15 - 4.3 Rated and limiting values for the main circuit
15 - 4.3.1 Rated voltages
15 - 4.3.2 Currents
16 - 4.3.3 Rated frequency
16 - 4.3.4 Rated duty
16 - 4.3.5 Normal load and overload characteristics
17 - 4.3.6 Short-circuit characteristics
17 - 4.4 Utilization category
18 - 4.5 Control circuits
18 - 4.6 Auxiliary circuits
18 - 4.7 Relays and releases
18 - 4.8 Vacant
18 - 4.9 Switching overvoltages
18 - 5 Product information
18 - 5.1 Nature of information
19 - 5.2 Marking
20 - 5.3 Instructions for installation, operation and maintenance
20 - 6 Normal service, mounting and transport conditions
20 - 7 Constructional and performance requirements
20 - 7.1 Constructional requirements
20 - 7.1.1 Materials
20 - 7.1.3 Clearances and creepage distances
21 - 7.1.4 Actuator
21 - 7.1.6 Additional requirements for equipment suitable for isolation
22 - 7.1.11 Degrees of protection of enclosed equipment
22 - 7.1.8 Additional requirements for equipment provided with a neutral pole
22 - 7.2 Performance requirements
22 - 7.2.1 Operating conditions
23 - 7.2.2 Temperature rise
23 - 7.2.3 Dielectric properties
23 - 7.2.4 Ability to make and break under no-load, normal load and overload conditions
25 - 7.2.5 Ability to make, break or withstand short-circuit currents
25 - 7.2.6 Vacant
25 - 7.2.7 Additional performance requirements for equipment suitable for isolation
26 - 7.2.8 Vacant
26 - 7.2.9 Overload requirements for equipment incorporating fuses
26 - 7.3 Electromagnetic compatibility
26 - 7.3.1 Vacant
26 - 7.3.2 Immunity
26 - 7.3.3 Emission
27 - 8 Tests
27 - 8.1 Kind of tests
27 - 8.1.1 General
27 - 8.1.2 Type tests
27 - 8.1.3 Routine tests
28 - 8.1.4 Sampling tests
28 - 8.1.5 Special tests
28 - 8.2 Type tests for constructional requirements
28 - 8.2.4 Mechanical properties of terminals
29 - 8.2.5 Verification of the strength of actuator mechanism and position indicating device
32 - 8.3 Type tests for performance
32 - 8.3.1 Test sequences
33 - 8.3.2 General test conditions
35 - 8.3.3 Test sequence I: General performance characteristics
38 - 8.3.4 Test sequence II: Operational performance capability
40 - 8.3.5 Test sequence III: Short-circuit performance capability
44 - 8.3.6 Test sequence IV: Conditional short-circuit current
46 - 8.3.7 Test sequence V: Overload performance capability
47 - 8.4 Electromagnetic compatibility tests
47 - 8.4.1 Immunity
47 - 8.4.2 Emission
47 - 8.5 Special tests
48 - 8.5.1 Mechanical durability
48 - 8.5.2 Electrical durability
49 - Annex A - Equipment for direct switching of a single motor
49 - A.1 Rated duty
49 - A.2 Making and breaking capacities
49 - A.3 Utilization category
51 - A.4 Operational performance
52 - A.4 Mechanical durability
52 - A.5 Electrical durability
52 - A.6 Verification of making and breaking capacities
52 - A.7 Operational performance test
52 - A.8 Special tests
55 - Annex B - Items subject to agreement between manufacturer and user

Applies to switches, disconnectors, switch-disconnectors and fuse-combination units to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1000 V a.c. or 1500 V d.c. Specifies characteristics of equipment, conditions with which the equipment shall comply with reference to operation and behaviour in normal service and specified abnormal conditions and dielectric properties, tests for confirming that these conditions have been met and the methods to be adopted for these tests and the information to be marked on the equipment or supplied by the manufacturer. This Standard is identical to and reproduced from IEC 60947-3:1999 and includes variations made to this document by its Corrigendum:1999/07 and Amendment 1:2001.

This standard applies to switches, disconnectors, switch-disconnectors and fuse-combination units to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1 000 V a.c. or 1 500 V d.c.The manufacturer shall specify the type, ratings and characteristics according to the relevant standard of any incorporated fuses.This standard does not apply to equipment coming within the scope of IEC 60947-2, IEC 60947-4-1 and IEC 60947-5-1; however, when switches and fuse-combination units coming into the scope of this standard are normally used to start, accelerate and/or stop an individual motor they shall also comply with the additional requirements given in annex A.Auxiliary switches fitted to equipment within the scope of this standard shall comply with the requirements of IEC 60947-5-1.This standard does not include the additional requirements necessary for electrical apparatus for explosive gas atmospheres.NOTE 1 – Depending on its design, a switch (or disconnector) can be referred to as "a rotary switch (disconnector)", "cam-operated switch (disconnector)", "knife-switch (disconnector)", etc.NOTE 2 — If they are not manually operated, switches and disconnectors may have to comply with additional requirements.NOTE 2 – In this standard, the word "switch" also applies to the apparatus referred to in French as "commutateurs", intended to modify the connections between several circuits and inter alia to substitute a part of a circuit for another.NOTE 3 – In general, throughout this standard switches, disconnectors, switch-disconnectors and fuse-combination units will be referred to as "equipment".The object of this standard is to statea) the characteristics of the equipment;b) the conditions with which the equipment shall comply with reference to1) operation and behaviour in normal service;2) operation and behaviour in case of specified abnormal conditions, e.g. short circuit;3) dielectric properties;c) the tests for confirming that these conditions have been met and the methods to be adopted for these tests;d) the information to be marked on the equipment or made available by the manufacturer, e.g. in the catalogue.

First published as AS 1775-1975.
Second edition 1984.
Revised and redesignated AS 3947.3-1994.
Jointly revised and designated AS/NZS 3947.3:2001.