Arc fault circuit interrupter which detects the cessation of...

Details Arc fault circuit interrupter which detects the cessation of... Arc fault circuit interrupter which detects the cessation of...

2006-02-14

2006-02-14

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

Reexamination Certificate

active

06999289

ABSTRACT:
An arc fault circuit interrupter which protects an AC circuit subjected to a possible arcing fault includes a sensor which produces a signal that can be evaluated to see if it is associated with arc fault current. The evaluation is done by a discrimination circuit which identifies a characteristic of the sensor signal associated with cessations of the arc fault current. An accumulator counts the number of occurrences of the cessations, and if the number of cessations counted within a predetermined time interval exceeds a predetermined number, the arc fault circuit interrupter interrupts the AC circuit.

REFERENCES:
patent: 4376243 (1983-03-01), Renn et al.
patent: 5223795 (1993-06-01), Blades
patent: 5280404 (1994-01-01), Ragsdale
patent: 5432455 (1995-07-01), Blades

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