Part converting A.C. fault contact breaker for D.C. - has auxiliary contact operated by fault detector latching mechanism

摘要

The part is for a fault operated orthodox A.C. contact breaker, so that D.C. fault operation is also achieved. The conversion consist of connecting a circuit block which is operated by a standard detector system and which provides an auxiliary contact operated by the detector controlling an unlatching mechanism. The circuit includes a current limiting device in the form of a resistor. The whole block is included in the A.C. contactor system by connection to the phase and neutral lines.