This document defines terms and specifies general test requirements for circuit breakers for use in road vehicles with a nominal voltage of 12 V (DC), 24 V (DC), 48 V (DC) and 450 V (DC). This document is intended to be used in conjunction with ISO 10924-2, ISO 10924-3, ISO 10924-4 and ISO 10924-5. The numbering of its clauses corresponds to that of the document whose requirements are applicable, except where modified by requirements particular to this document. This document is not applicable to circuit breaker holders (electrical centres or fuse-holders) used in vehicles.