Circuit breaker with improved delay

Details Circuit breaker with improved delay Circuit breaker with improved delay

1976-05-07

1977-12-06

Broome, Harold

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

335 59, 335 63, H02H 708, H01H 700

Patent

active

040620522

ABSTRACT:
Disclosed is a magnetic circuit breaker having improved delay characteristics and particularly improved pulse tolerance. The trip coil of the breaker is spaced from the magnetic pole piece of a delay tube by a non-conductive, non-magnetic gap and the delay core is elongated. An inertia wheel is mechanically coupled to the trip armature to further increase pulse tolerance so as to reduce nuisance tripping in the presence of high but very short term overcurrents. The circuit breaker provides a significantly improved motor protection characteristic.

REFERENCES:
patent: 3517357 (1970-06-01), Bakes
patent: 3638157 (1972-01-01), Kruzic
patent: 3689855 (1972-09-01), Setone et al.
patent: 3777294 (1973-12-01), Grenier
patent: 3959755 (1976-05-01), Harper et al.
patent: 3987340 (1976-10-01), Kussy

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