초록 ▼

A self-testing arc fault or ground fault detector includes arc fault detecting circuitry and components. The detector includes a testing circuit which tests at least part of the circuitry and components and generates a recurring signal when the test completes successfully. If the test does not compl

A self-testing arc fault or ground fault detector includes arc fault detecting circuitry and components. The detector includes a testing circuit which tests at least part of the circuitry and components and generates a recurring signal when the test completes successfully. If the test does not complete successfully, the signal is lost. This loss of signal is signaled by an indicator connected to the testing circuit. In one version, the loss of signal activates a circuit interrupter which disconnects the load side of the detector from the line side.

대표청구항 ▼

1. A self testing arc fault detector comprising:a transformer coupled to an electrical circuit and responsive to an arcing condition in the circuit for generating a signal; a detector responsive to the signal for indicating the presence of an arcing condition; a clock generating periodic timing sign

1. A self testing arc fault detector comprising:a transformer coupled to an electrical circuit and responsive to an arcing condition in the circuit for generating a signal; a detector responsive to the signal for indicating the presence of an arcing condition; a clock generating periodic timing signals, and a test generator connected to the transformer and the clock for periodically applying a test signal to the transformer for producing a first signal if the transformer is not operational, a fault detector connected to the transformer and the clock for generating a fault signal unless a first signal is received within a predetermined time after receipt of a timing signal.