What should be a Marking On Circuit Breakers...?

Marking On Circuit Breakers

Each circuit-breaker shall be marked in a durable manner.

a)  The following data shall be marked on the circuit-breaker itself or on a nameplate or nameplates attached to the circuit-breaker, and located in a place such that they are visible and legible when the circuit-breaker is installed;

1. Rated current (In).
2. Suitability for isolation, if applicable, with the symbolic Indication of the open and closed positions, with O and I respectively, if symbols are used.

b) The following data shall also be marked externally on the circuit-breaker, except that they need not be visible when the circuit-breaker is installed;

1. Manufacturer’s name or trade mark;
2. Type designation or serial number;
3. IEC 60947-2 if the manufacturer claims compliance with this standard;
4. Utilization category;
5. Rated operational voltage
6. Rated impulse withstand voltage;
7. Value (or range) of the rated frequency
8. Rated service short-circuit breaking capacity at the corresponding rated voltage;
9. Rated ultimate short-circuit breaking capacity at the corresponding rated voltage
10. Rated short-time withstand current, and associated short-time delay, for utilization category B;
11. Line and load terminals, unless their connection is immaterial;
12. Neutral pole terminals, if applicable, by the letter N;
13. Protective earth terminal, where applicable, by the symbol
14. Reference temperature for non-compensated thermal release, if different from 30 ‘C.

c) The following data shall either be marked on the circuit-breaker as specified in item b), or shall be made available in the manufacturer’s published information:

1. Rated short-circuit making capacity,
2. Rated insulation voltage, if higher than the maximum rated operational voltage,
3. Pollution degree if other than 3;
4. Conventional enclosed thermal current if different from the rated current,
5. IP Code, where applicable
6. Minimum enclosure size and ventilation data (if any) to which marked ratings apply;
7. Details of minimum distance between circuit-breaker and earthed metal parts for circuit-breakers intended for use without enclosures;
8. Suitability for environment A or environment B, as applicable,
9. R.M.S. sensing, if applicable

D)  The following data concerning the opening and closing devices of the circuit-breaker shall be placed either on their own nameplates or on the nameplate of the circuit-breaker; alternatively, if space available is insufficient, they shall be made available in the manufacturer’s published information:

1. Rated control circuit voltage of the closing device and rated frequency for alternating current
2. Rated control circuit voltage of the shunt release and/or of the under-voltage release, and rated frequency for Alternating current;
3. Rated current of indirect over-current releases;
4. Number and type of auxiliary contacts and kind of current, rated frequency and rated voltages of the auxiliary switches, if different from those of the main circuit.
5. Terminal marking.

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