Combination circuit breaker-lightning arrestor

Details Combination circuit breaker-lightning arrestor Combination circuit breaker-lightning arrestor

1977-12-16

1979-09-18

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 55, 361106, 361115, 337 28, 337 34, H02H 722

Patent

active

041685148

ABSTRACT:
A conventional automatic electric circuit breaker is combined with a varistor to provide both overcurrent and overvoltage circuit protection. The varistor is connected between the load end of the circuit breaker and neutral to shunt to ground the currents associated with lightning induced voltage surges. As a fail-safe feature, abnormal leakage current drawn by the varistor under normal line voltage conditions directly and/or indirectly heats the thermal element of the breaker trip unit, ultimately tripping the breaker.

REFERENCES:
patent: 3152287 (1964-10-01), Edmunds
patent: 3312889 (1967-04-01), Gold
patent: 3464040 (1969-08-01), Powell
patent: 3717792 (1973-02-01), Gryctko
patent: 3733516 (1973-05-01), Grunert et al.
patent: 3737725 (1973-06-01), Donnelly
patent: 3887849 (1975-06-01), Nagel
patent: 3889222 (1975-06-01), Takano et al.
patent: 3934175 (1976-01-01), Clark
patent: 4019097 (1977-04-01), Miller et al.
patent: 4068281 (1978-01-01), Harnden, Jr.
"Circuit Protectors," Catalogue No. 749, 1974, MCG, Electronics Inc., pp. 1-5.

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