ELECTRICAL ISOLATION APPARATUS AND A METHOD AND A SYSTEM FOR CONNECTING A DC ELECTRICAL SUPPLY INTO AN AC MAINS ELECTRICITY SUPPLY

摘要

An electrical isolation apparatus (1) comprises a main housing (5) within which first and second circuit breakers (18,19) are located. First and second operating elements (23,24) are provided for operating the first and second circuit breakers (18,19) between open circuit and closed circuit states. The first operating element (23) comprises a circular first disc element (33) having a recess (36) formed in an outer circumferential periphery (35) thereof. The second operating element (24) comprises a circular second disc element (38) having a projecting lug (40) extending therefrom engageable with the recess (36) in the first disc element (33) when the first and second circuit breakers (18,19) are in the closed circuit state, so that the second circuit breaker (19) must be operated from the closed circuit state to the open circuit state before the first circuit breaker (18) can be operated from the closed circuit state to the open circuit state.