Overcurrent protection circuit

Details Overcurrent protection circuit Overcurrent protection circuit

1997-06-02

1998-11-03

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 9, 361 93, 361106, 361166, 361187, H02H 300

Patent

active

058318038

ABSTRACT:
A circuit protection system employing arrangements of PTC devices and mechanical switches. The PTC device is not involved in the circuit until a fault is sensed. A current sensing relay senses an overcurrent and directs the current to the PTC device. As the voltage across the PTC device increases, a parallel arrangement of voltage sensing relays completes the operation of the protection system, and disconnects the load until the protection system is reset. The protection system may be reset manually or remotely.

REFERENCES:
patent: 5666254 (1997-09-01), Thomas et al.
patent: 5689395 (1997-11-01), Duffy et al.
patent: 5737160 (1998-04-01), Duffy

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