| 摘要 |
<p>A circuit breaker (1,350) includes separable contacts (47), an operating mechanism (22), a power supply (270;402,452), and a trip mechanism (53) powered from a first power supply output (286). A power supply monitor circuit (272) includes a terminal (306,127) adapted for electrical connection to a ground, a first resistor (308) electrically connected in series with a power supply regulator (284), a first transistor (310) having an output (313) and two inputs (311,312) electrically connected in parallel with the first resistor (308), a first capacitor (314) electrically connected between the first power supply output (286) and the first transistor output (313), a second resistor (316) electrically connected in series with the first capacitor (314) between power supply outputs (286,290), a second transistor (318) having a first input (319) electrically interconnected with the first transistor output (313), a second input (320) and an output (321), a diode (322) electrically connected between the terminal (306,127) and the second transistor second input (320), and an interface (324) between the second transistor output (321) and a trip mechanism input (432) for disabling the tripping.</p> |
