Testers

Details Testers Testers

1980-07-03

1982-08-10

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 71, 361 88, 361 91, 324110, H02H 306

Patent

active

043441017

ABSTRACT:
A circuit tester is disclosed which automatically open-circuits a main lead to an input circuit in response to an excessive overcurrent. The circuit tester of the present invention will automatically sense the existence of an excessive current which, in turn, open-circuits a main lead to the input circuit, actuates a buzzer and energizes a light-emitting diode. Since the main-lead to the input circuit has been open-circuited, the base voltage at a first transistor drops. This renders this transistor non-conductive and tends to cause the main-lead to the input circuit to short-circuit. This tends to restore the circuit tester to its initial condition. However, if the excessive current is continuing, the above sequence will re-commence, the sequence continuing until the excessive current no longer exists or until the tester is adjusted to a higher range of operation.

REFERENCES:
patent: 2451953 (1948-10-01), Ingram
patent: 3024388 (1962-03-01), Blitchington
patent: 3042865 (1962-07-01), Stetzler
patent: 3426274 (1969-02-01), Wise
patent: 3666993 (1972-05-01), Legatti
patent: 4092591 (1978-05-01), Lozowski

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