Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1976-11-01
1978-03-28
Miller, J D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 1, H02H 308
Patent
active
040818543
ABSTRACT:
A circuit for protecting an electric meter having its input connected to a source of DC current. The system includes three circuit breakers having their outputs connected in parallel, while their inputs are connected to the output of the electric meter through a plurality of switches adapted to provide the user with means for selectively choosing one or more of the circuit breakers in a predetermined combination such that the meter may be set to measure the current flow through a circuit wherein the amount of current permitted to flow through the meter may be selectively varied. The outputs of the circuit breakers are electrically connected to the circuit to be tested through an on-off switch which permits the user to selectively initiate testing of a circuit, as desired. The input to the electric meter and the output of the on-off switches are electrically connected through a signaling device which is operable to provide the user with a warning that the circuit is overloaded and that one of the circuit breakers has been activated to terminate flow through the electrical meter.
REFERENCES:
patent: 2571048 (1951-10-01), Medlar
patent: 3341762 (1967-09-01), Rockoff
Miller J D.
Salce Patrick R.
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