Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1991-10-18
1993-06-29
Scott, J. R.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200147R, 200147B, 335 16, 335201, H01H 3310, H01H, H01H, H01H 7700, H01H 930
Patent
active
052236811
ABSTRACT:
A molded plastic current limiting circuit breaker having for each pole, a stationary and movable contact separable upon occurrence of a current higher than a predetermined level. The stationary and movable contacts are positioned inside an over-molded magnet opening to greatly increase the magnetic repulsion force between them and rapidly accelerate their separation by concentrating the magnetic fields generated upon an occurrence of a high level short circuit. The over-molded magnet is composed of a plurality of steel plates grouped together and being over molded with a thermoplastic material. The thermoplastic material has grooves integrally formed therein for retaining insulator inserts that protect the thermoplastic material during separation of the stationary and movable contacts.
REFERENCES:
patent: 3929660 (1975-12-01), Khalid
patent: 3946346 (1976-03-01), Oster et al.
patent: 4612430 (1986-09-01), Sloan et al.
patent: 4618751 (1986-10-01), Wehr et al.
Buehler Steven H.
Diekman Christopher M.
Faber Timothy R.
Netolicky Charles E.
Golden Larry I.
Irfan Kareem M.
Scott J. R.
Square D Company
Stoppelmoor Wayne H.
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