Circuit breaker protection against "arc short circuit" hazards

Details Circuit breaker protection against "arc short circuit" hazards Circuit breaker protection against "arc short circuit" hazards

1994-09-19

1996-04-23

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 42, 361102, 361105, H02H 902

Patent

active

055109462

ABSTRACT:
An electrical service installation comprises a plurality of circuit breakers protecting against overcurrent hazards in branch load circuits. An acceleration, bypass circuit is provided for each circuit breaker. Current flow through each of the bypass circuits is controlled by a normally non-conductive SCR. Current flow to each branch circuit passes through a sensing resistor that is connected across the gate and cathode of the associated SCR. When the voltage drop across the sensing resistor reflects a current level indicative of an "arc short circuit", the SCR is triggered to a conductive state. Current then flows through the bypass circuit increasing current flow through the associated circuit breaker, to thereby provide a substantially increased current magnitude for magnetically tripping the circuit breaker. Circuit breakers are thus tripped to provide protection against the hazards of "arc short circuit" currents that do not have a magnitude sufficient to initiate magnetic tripping.

REFERENCES:
patent: 4079439 (1978-03-01), Coles et al.
patent: 4673097 (1987-06-01), Schuldt
patent: 4700259 (1987-10-01), Stokes
patent: 4858054 (1989-08-01), Franklin

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