Circuit interrupter with cause for trip indication

Details Circuit interrupter with cause for trip indication Circuit interrupter with cause for trip indication

1994-06-24

1996-08-13

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361115, 340638, H02H 333

Patent

active

055462669

ABSTRACT:
In a circuit interrupter which has multiple electronic trip circuits, such as ground fault and arcing fault trip circuits, indicators such as LED's produce an indication of the cause of the trip. The trip signals are latched to provide a continuing trip indication and ORed to actuate the trip device. In one embodiment SCR's connected in series with the indicator LED's serve as the latches and are connected in parallel to the trip device to provide the OR function. In other embodiments, flip-flops serve as the latches. In one such embodiment, the indicator LED's are connected from the respective flip-flops in parallel to the trip device to provide the OR function. In another such embodiment the flip-flops actuate the trip device and turn on switches actuating the LED's These switches energizing the cause of trip LED's are disabled until the contacts open to assure operation of the trip device. Alarms can be coupled to the trip circuit by additional LED's, preferably IR LED's, connected in series with the indicator LED's.

REFERENCES:
patent: 4081852 (1978-03-01), Coley et al.
patent: 4209761 (1980-06-01), Klein et al.
patent: 4344100 (1982-08-01), Davidson
patent: 4752853 (1988-06-01), Matsko et al.
patent: 4794356 (1988-12-01), Yun et al.
patent: 5224006 (1993-06-01), Mackenzie et al.

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