High level magnetic trip circuit

Details High level magnetic trip circuit High level magnetic trip circuit

1985-04-19

1987-03-24

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 95, 361111, H02H 308

Patent

active

046529659

ABSTRACT:
An electrical circuit to signal a circuit breaker to trip when the circuit breaker is closed and a high level fault occurs or when a low level fault occurs while the breaker is in the process of closing. A mechanical switch tied to the breaker contacts deactivates the low level trip function when the contacts are closed. A high level overcurrent causes a trigger diode to conduct current, energizing an opto-coupler that causes the trip solenoid to trip the breaker. The circuit also causes the breaker to trip if a sustained medium level overcurrent exists.

REFERENCES:
patent: 3475061 (1969-10-01), Steinkamp et al.
patent: 3924160 (1975-12-01), Maier et al.
patent: 4004201 (1977-01-01), Du Puy
patent: 4368499 (1983-01-01), Stifter
patent: 4443828 (1984-04-01), Legrand et al.

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