Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1999-08-18
2000-08-08
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335172, H01H 7512, H01H 8300
Patent
active
061007773
ABSTRACT:
This concerns a four pole molded case circuit breaker having separable main contacts and an operating mechanism utilized to cause the separable main contacts to open and close. A trip unit is provided to actuate the operating mechanism in desirable circumstances. The circuit breaker in this case has four-poles, one of which is a neutral pole. The circuit breaker trip unit has rotatable trip bars therein, one of which is associated with the three-line terminals and one of which is associated with the neutral terminal. If the line terminal trip bar is actuated to move because of a fault to overload in one of the line terminals, only the line terminals will open because the neutral trip bar will not be moved. However, if the neutral trip bar is moved because of a predescribed neutral current value in the neutral conductor all of the contacts including the neutral contact will be opened because of the interlocking arrangement between the neutral trip bar and the line trip bar.
REFERENCES:
patent: 4503408 (1985-03-01), Mrenna
patent: 5121092 (1992-06-01), Castonguay et al.
patent: 5153544 (1992-10-01), Castonguay et al.
patent: 5444423 (1995-08-01), Venzke et al.
patent: 5444424 (1995-08-01), Wong et al.
patent: 5910760 (1999-06-01), Malingowski
Mueller Robert W.
Sumpman Wayne C.
Donovan Lincoln
Eaton Corporation
Moran Martin J.
Nguyen Tuyen T.
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