Shorting fusable metal oxide varistor

Details Shorting fusable metal oxide varistor Shorting fusable metal oxide varistor

1998-03-06

1999-11-09

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361104, 361124, H02H 504

Patent

active

059825979

ABSTRACT:
A fuse assembly comprising a fuse element and a fuse cavity are formed integrally with the body of a Metal Oxide Varistor (MOV). Melting of the fuse element forms fused material which flows into the fuse cavity. The molten material electrically joins the metalization films on each side of the MOV which causes the MOV to fail shorted before the MOV can overheat and fracture from over voltage caused by excessive transient voltages. The fuse element has the current carrying capability to allow a resultant current to flow which will cause the primary circuit protection device (fuse or circuit breaker) to open. This provides protection against a violent fracture of the MOV and a MOV that can no longer function because it has opened and is undetected.

REFERENCES:
patent: 5708553 (1998-01-01), Hung
patent: 5781394 (1998-07-01), Lorenz et al.

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