Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1988-06-13
1990-05-15
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361394, 335 18, 335 21, 335155, 335156, 335201, H02H 308
Patent
active
049262823
ABSTRACT:
An electric circuit breaker for protecting an electric circuit of an electrical installation of a building is of such a construction that a substantial proportion of its components are standard for the preferred current ratings of the breaker and that some components having a limited useful life can be readily replaced. The circuit breaker comprises a switching unit with a moulded case housing, fixed and movable contacts, a tripping mechanism and a manually operable dolly switch; an over-current release unit having a moulded case, separately formed with respect to the case of the switching unit, housing an electromagnetic device operatively mechanically coupled to the tripping mechanism and adapted to be electrically interconnected in a power circuit independent of the power circuit to be protected and a current sensor for continuously providing an output signal which is a function of the current flowing through the circuit to be protected, the switching and over-current release units being so detachably electrically connected that current which will flow through the circuit to be protected will flow through the switching unit; and, electrically connected to the current sensor, a microprocessor. The microprocessor can be so programmed that, in the event of a short circuit or sustained overload, a current is caused to flow through the independent power circuit to operate the electromagnetic device and thereby initiate operation of the tripping mechanism of the switching unit.
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BICC Public Limited Company
Casella Anthony J.
Hespos Gerald E.
Jennings Derek S.
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