Field-installable heavy duty undervoltage release

Details Field-installable heavy duty undervoltage release Field-installable heavy duty undervoltage release

1989-03-06

1990-08-07

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361115, 361152, 361210, 335 20, 335254, H02H 324, H01H 8300

Patent

active

049472844

ABSTRACT:
An undervoltage tripping unit for a power line circuit breaker features a holding solenoid and a boostig solenoid having their associated plungers coupled to move together so as to be retracted against the force of plunger biasing springs when both solenoids are energized. Release of the plungers from the retracted position is used to trip the associated power line circuit breaker when the line voltage falls below a tripping voltage level. The holding solenoid is continuously coupled to the circuit breaker power input terminals. The booster solenoid is energized through a plunger-actuated switch so as to be de-energized when the plungers are fully retracted or in a position proximate thereto.

REFERENCES:
patent: 2365957 (1944-12-01), Holslag
patent: 2472553 (1949-06-01), Theunissen
patent: 3551754 (1970-12-01), Shaffer
patent: 3708723 (1973-01-01), Shand et al.
patent: 3790862 (1974-02-01), Kampf et al.
patent: 3922624 (1975-11-01), Basile
patent: 4013926 (1977-03-01), Lang et al.
patent: 4609965 (1986-09-01), Baker
patent: 4675776 (1987-06-01), Howell
patent: 4706158 (1987-11-01), Todaro et al.
patent: 4788621 (1988-11-01), Russell et al.

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