Circuit breaker with wide operational current range

Details Circuit breaker with wide operational current range Circuit breaker with wide operational current range

1998-05-07

1999-08-03

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

337 76, H02H 504

Patent

active

059333103

ABSTRACT:
A breaker circuit for disconnecting a surge arrestor is operable over a wide range of current values. A spring-tensioned conductor connects a first potential to a first terminal of the arrestor while a second terminal of the arrestor communicates with a second potential. The conductor is fuse-like and of predetermined current carrying capacity. The end of the conductor is connected to the first terminal by a solder bead of predetermined thermally-dependent strength. At low current values I.sup.2 R heating of the arrestor gradually weakens the solder bond to the first terminal, making it subject to disconnection by spring-induced tension force. At high current values, the conductor vaporizes to provide the rapid disconnect required to avoid explosion and/or fire.

REFERENCES:
patent: 5198791 (1993-03-01), Shibayama et al.
patent: 5200875 (1993-04-01), Yoshioka et al.
patent: 5276422 (1994-01-01), Ikeda et al.

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