In addition to the general requirements of IEC 60077-2, this part of IEC 60077 gives the rules for circuit-breakers, the main contacts of which are to be connected to d.c. power and/or auxiliary circuits. The nominal voltage of these circuits does not exceed 3 000 V d.c. according to IEC 60850. This part of IEC 60077, together with IEC 60077-2, states specifically a) the characteristics of the circuit-breakers; b) the service conditions with which circuit-breakers have to comply with reference to - operation and behaviour in normal service; - operation and behaviour in the case of short circuit; - dielectric properties; c) the tests for confirming the compliance of the components with the characteristics under the service conditions and the methods to be adopted for these tests; d) the information to be marked on, or given with, the circuit breaker. This standard does not cover a) multi-connection of electrotechnical components to achieve a particular duty; b) industrial circuit-breakers which have to comply with IEC 60947-2; c) d.c. circuit-breakers for fixed installations which have to comply with IEC 61992-2.

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