Solenoid operator circuit for molded case circuit breaker

Details Solenoid operator circuit for molded case circuit breaker Solenoid operator circuit for molded case circuit breaker

1984-01-09

1987-02-10

Tolin, G. P.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361195, 307141, 307598, H01H 4718

Patent

active

046427260

ABSTRACT:
A molded case circuit breaker includes a solenoid control circuit for controllably energizing a solenoid to actuate a motor operator to automatically move a handle of the circuit breaker to change the operative condition of the circuit breaker. The control circuit includes a monostable multivibrator that supplies an electrical pulse to the solenoid upon the receipt of a switching initiation signal. The time duration of the electrical pulse is controlled to be sufficiently long to assure proper operation of the solenoid and is determined by a timing circuit coupled to the source of operating voltage for the solenoid. If the operating voltage decreases, the time required to charge the timing circuit increases, increasing the duration of the electrical pulse of the solenoid to assure proper operation under low voltage conditions.

REFERENCES:
patent: 3406295 (1968-10-01), Corey
patent: 3973140 (1976-08-01), Phillips
patent: 4012673 (1977-03-01), Saarem et al.
patent: 4096542 (1978-06-01), Pappas et al.
patent: 4251848 (1981-02-01), Dogadko et al.
patent: 4538074 (1985-08-01), Fraden

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