| 摘要 |
An electrical protection system includes a control element of a series combination of a PTC device thermally coupled with a resistive device, and a relay coil coupled with relay contacts. If the relay contacts are open the only way in which they can be closed is by supplying current to the relay coil through a resistance-capacitance network. A diode permits current to pass through the resistance-capacitance network to the relay coil but prevents current from flowing in the opposite direction thereby preventing relay contact chatter, contact fusing, and potential relay catastrophic failure.
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