Circuit breaker with improved single coil actuator and undervolt

Details Circuit breaker with improved single coil actuator and undervolt Circuit breaker with improved single coil actuator and undervolt

1975-09-25

1977-04-05

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 20, 361187, H01H 8312

Patent

active

040165183

ABSTRACT:
A multipole circuit breaker including a trip release actuator having a single coil coaxially surrounding a plunger and mounted within a hollow cylindrical actuator support frame. The actuator is mounted in association with a latch mechanism and includes a spring biasing the plunger toward release of the latch mechanism. The coil is responsive to an electronic sensing and control circuit and serves, when energized, to oppose the action of the bias spring and maintain the plunger in a position to prevent release of the latch mechanism during normal conditions. Upon either undervoltage or overcurrent conditions the sensing and control circuit deenergizes the coil, allowing the bias spring to move the plunger into engagement with the latch mechanism, effecting release of the latch mechanism and separation of the circuit breaker contacts.

REFERENCES:
patent: 3611215 (1971-10-01), Patel
patent: 3688227 (1972-08-01), Hong

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