Metal oxide varistors having thermal protection
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
May 6, 1998
filing date -
May 6, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A layer of thermal fusible material is placed on one surface of a metal oxide varistor (MOV) to monitor the heating of the MOV due to applied voltage spikes. The thermal fusible material is part of the electrical circuit which includes the MOV and melts at a predetermined temperature. In the presence of a severe or a number of voltage spikes the MOV heats up and the heat transferred to the thermal fusible material causes it to open the electrical circuit to the MOV to prevent overheating and thermal runaway. In another form, the MOV is separated into two halves and the thermal fusible material layer is placed between the ends of the MOV halves.
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