BS 775-2:1974
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for contactors A.C. contactors for voltages above 1 kV and up to and including 12 kV
Hardcopy , PDF
15-01-2001
English
30-09-1974
Cooperating organizations
Foreword
Specification
1. General
1.1 Scope
1.2 Object
2. Definitions
2.1 Definitions
2.1 Definitions concerning contactors
2.2 Definitions concerning positions and control
and auxiliary circuits of a contactor
3. Classification
4. Characteristics of contactors
4.1 Summary of characteristics
4.2 Type of contactor
4.3 Rated values
4.4 Control circuits and air-supply systems
4.5 Auxiliary circuits
4.6 Coordination with short-circuit
5. Nameplates
6. Operating conditions
6.1 Normal service conditions
7. Construction
7.1 Mechanical design
7.2 Temperature rise
7.3 Dielectric properties
7.4 Limits of operation
8. Tests
8.1 Verification of the characteristics of contactors
8.2 Type tests
8.3 Routine tests
8.4 Special tests
Appendix
A. Information to be given by the purchaser when the
operating conditions are different from those
stated in 6.1
Tables
1. Utilization categories
2. Verification of rated marking and breaking currents
3. Verification of the number of on-load operating
cycles
4. Preferred values of the rated control supply
voltage
5. Temperature rise-limits for insulated coils in
air and in oil
6. Temperature-rise limits for the various materials
and parts
7. Standard cross sections of copper conductors
corresponding to the rated thermal current
8. Test voltage
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