Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1979-03-19
1981-07-07
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 94, 361 98, H02H 308
Patent
active
042778115
ABSTRACT:
A static type circuit breaker in which a transistor is arranged in the current path by which electrical power is supplied to a load from a power source. If short circuit trouble occurs, the fault current flowing in the load circuit is detected so that a luminous diode in a detector circuit is made to cease emitting light. A phototransistor photocoupled to this luminous diode and arranged in the base circuit of the transistor is made non-conductive and produces a short circuit between the base and the emitter of the transistor, whereby the transistor is made non-conductive so that the fault current is cut off.
REFERENCES:
patent: 3211927 (1965-10-01), Klee
patent: 3214641 (1965-10-01), Sonnemann
patent: 3875464 (1975-04-01), Gary et al.
Salce Patrick R.
Tokyo Shibaura Electric Company Limited
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