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;
- Rated current (In).
- 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;
- Manufacturer’s name or trade mark;
- Type designation or serial number;
- IEC 60947-2 if the manufacturer claims compliance with this standard;
- Utilization category;
- Rated operational voltage
- Rated impulse withstand voltage;
- Value (or range) of the rated frequency
- Rated service short-circuit breaking capacity at the corresponding rated voltage;
- Rated ultimate short-circuit breaking capacity at the corresponding rated voltage
- Rated short-time withstand current, and associated short-time delay, for utilization category B;
- Line and load terminals, unless their connection is immaterial;
- Neutral pole terminals, if applicable, by the letter N;
- Protective earth terminal, where applicable, by the symbol
- 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:
- Rated short-circuit making capacity,
- Rated insulation voltage, if higher than the maximum rated operational voltage,
- Pollution degree if other than 3;
- Conventional enclosed thermal current if different from the rated current,
- IP Code, where applicable
- Minimum enclosure size and ventilation data (if any) to which marked ratings apply;
- Details of minimum distance between circuit-breaker and earthed metal parts for circuit-breakers intended for use without enclosures;
- Suitability for environment A or environment B, as applicable,
- 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:
- Rated control circuit voltage of the closing device and rated frequency for alternating current
- Rated control circuit voltage of the shunt release and/or of the under-voltage release, and rated frequency for Alternating current;
- Rated current of indirect over-current releases;
- 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.
- Terminal marking.
