| 摘要 |
<p>A ground fault circuit interrupter, GFCI, interrupts the flow of current through a pair of lines (L, N) extending between a source of power and a load and includes a circuit breaker having a switch located in one of the pair of lines. The switch has a first position in which the source is not connected to the load and a second position in which the source is connected to the load. A relay circuit (15) including a solenoid (SOL1) is coupled to the switch for selectively positioning the switch in either the first or second position. When the solenoid is energized, the switch is positioned in the second position and when the solenoid is de-energiyed, the switch is positioned in the first position. A booster circuit (19) selectively supplies a first voltage to the solenoid which is sufficient to energize the solenoid and a power supply circuit (17) supplies a second lower valued voltage to the solenoid sufficient to maintain the solenoid in its energized state. A latch circuit (23) allows the solenoid to switch between energized states and a fault detecting circuit (21) detects a fault condition thereby causing the latch circuit to latch the solenoid in the de-energized state.</p> |
