Electric protection systems including PTC and relay-contact-prot

Details Electric protection systems including PTC and relay-contact-prot Electric protection systems including PTC and relay-contact-prot

1999-03-23

2000-06-06

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 931, 361 939, 361106, 361165, H02H 300

Patent

active

060726792

ABSTRACT:
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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