Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-11-04
1999-07-20
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 94, 340638, H02H 304
Patent
active
059263555
ABSTRACT:
A circuit breaker includes separable contacts for movement between a closed position and an open position. An operating mechanism moves the separable contacts between the closed and open positions and has a closed state and an open or tripped state which corresponds to the open position. A trip circuit senses electrical current flowing through the separable contacts, employs the sensed current to trip the operating mechanism to the tripped state to move the separable contacts to the open position, and provides plural status signals. A display circuit cooperates with the trip circuit and includes light emitting diodes for outputting the status signals. A battery powers the display circuit which further includes an oscillator circuit for modulating the LEDs to reduce power from the battery to the display circuit.
REFERENCES:
patent: 4751606 (1988-06-01), Matsko et al.
patent: 5270898 (1993-12-01), Elms et al.
patent: 5341191 (1994-08-01), Crookston et al.
Johnson Richard A.
Massoud John A.
Matsko Joseph J.
Eaton Corporation
Huynh Kim
Leja Ronald W.
Moran Martin J.
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