Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Tripping means
Patent
1978-07-28
1980-07-15
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Tripping means
335254, H01H 920
Patent
active
042131090
ABSTRACT:
An electromagnetic tripping device for protecting a printed circuit card by opening an electrical circuit of the card in response to an overcurrent of the circuit. The device includes contacts and an energizing coil which are connected in series with the circuit to be opened. When the contacts of the device are closed and the circuit current is normal, a magnetic holding flux provided by a bar magnet holds a plate in contact with two spaced and parallel side-walls between which is located the bar magnet. When an overcurrent occurs, the energizing coil produces a breaking flux which reduces the holding flux sufficiently so that the plate may be moved from the side-walls by a return spring, thereby opening the contacts and the circuit. When the plate is moved from the side-walls, an actuating rod which passes through an opening in the plate is projected out of the device housing to indicate the opening of the circuit. An axial force applied to the projecting end of the actuating rod allows the plate to be reset in contact with the side-walls by an auxiliary spring to reset the device with a like amount of force each time.
REFERENCES:
patent: 3783422 (1974-01-01), Taylor
Broome Harold
Compagnie Generale d'Appareillage Electrique C.G.A.E.
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