Earth leakage protective circuit.,申请号EP19850301159-传众专利搜索

Earth leakage protective circuit.

申请公布号：EP0154450(A1)

申请号：EP19850301159

申请日期：1985.02.21

申请公布日期：1985.09.11

申请人：

DELTA ELECTRICAL (HOLDINGS) LIMITED

发明人：HORTON, HENRY CHARLES

分类号：H02H3/33;(IPC1-7):H02H3/33;H02H11/00

主分类号：H02H3/33

摘要：<p>An earth leakage protective circuit has a contact breaker with its contacts (CB) in the live line (L) of the current supply. The coil (LI) of the circuit breaker has connected with it a semiconductor switch (CSR1) which is rendered conducting when earth leakage is detected by a circuit including a balance transformer (CT2) and an IC amplifier (IC1). To protect the load circuit additionally against loss of neutral, a second semiconductor switch (CSR2) is connected in series with the coil (L1). The second switch is controlled by a detector circuit (R9, D8, R12) which renders it conducting when the neutral supply line (N) becomes open-circuit, so that the circuit breaker contacts (CB) are opened.</p>