Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1975-12-08
1977-08-09
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335166, H01H 8312
Patent
active
040414230
ABSTRACT:
An undervoltage trip coil and armature, with a pivotal member biased against and riding on the latch pin of the armature to sense its position. On occurrence of a low voltage condition, a trip lever causes the latch mechanism of the breaker to trip. The pivotal member then interferes with the latch and prevents reset. The undervoltage trip coil is normally energized to normally attract the undervoltage armature. On occurrence of a specified undervoltage condition the armature releases causing the trip lever to trip the latch mechanism and allowing the pivotal member to interfere with the latch of the breaker. During such condition, the breaker cannot be reset until the armature is attracted to the undervoltage coil under proper voltage condition.
REFERENCES:
patent: 3723924 (1973-03-01), Shaffer et al.
patent: 3806846 (1974-04-01), Powell
patent: 3919674 (1975-11-01), Acampora et al.
Layton Beryl W.
Ophaug Darrell P.
Broome Harold
Guttman Richard T.
Kettelson Ernest S.
Lesser Norton
Square D Company
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