Overload protected solid state varistors

Details Overload protected solid state varistors Overload protected solid state varistors

1998-08-11

2000-07-25

Donovan, Lincoln

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 20, 338 67, H01L 710

Patent

active

060941286

ABSTRACT:
A fail-safe varistor includes either a fail-short or a fail-open device. Both devices include a fusible, electrically conductive material that melts before the varistor fails due to overvoltage. In the fail-open device, the fusible, electrically conductive material joins separated portions of the leads. The material also may join at least one of the leads directly to a ceramic disk of the varistor. Upon reaching the predetermined temperature, the varistor melts causing a circuit including the varistor to open. In the fail-short device, the material melts creating a short between the leads. This short causes a fuse or a breaker to open the circuit.

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