Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Retarded or delayed type
Patent
1978-12-29
1980-12-09
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Retarded or delayed type
335236, H01H 702, H01F 312
Patent
active
042387493
ABSTRACT:
An electromagnetic circuit breaker is provided having a flux producing solenoid and a movable armature attractable to the solenoid upon the occurrence of a predetermined current level and duration. A flux path in the form of members of low reluctance are arranged so that the flux circuit comprises a plurality of loops, each loop having one or more variable reluctances which are dependent upon the position of the armature and a movable core located within the solenoid. Increased pulse resistance is obtained without substantially effecting the operation of the switch upon sustained overloads of a predetermined level and duration. The bobbin on which the solenoid coil is wound is provided with a groove with which a member of low reluctance is lockingly engaged. Other low reluctance members are configured to facilitate assembly of the circuit breaker.
REFERENCES:
patent: 3307130 (1967-02-01), Camp
patent: 3689855 (1972-09-01), Setone et al.
patent: 3777294 (1973-12-01), Grenier
Brown David M.
Lawson Martin W.
Broome Harold
Haug John A.
McAndrews James P.
Sharp Melvin
Texas Instruments Incorporated
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