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Circuit and method for wetting relay contacts

  • US 7,573,360 B2
  • Filed: 08/10/2006
  • Issued: 08/11/2009
  • Est. Priority Date: 08/17/2005
  • Status: Expired due to Fees
First Claim
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1. A circuit for wetting relay contacts, the circuit comprising:

  • a relay having a relay coil, a movable contact and a stationary contact, the movable contact being movable between an open position and a closed position upon energizing of the relay coil, the movable contact engages the stationary contact in the closed position, the movable contact being moved from the closed position to the open position when the relay coil is de-energized;

    a transistor connected to the movable contact and a load; and

    a resistor connected to the transistor and the relay that senses voltage drop at the relay coil and turns on the transistor to load the movable contact after the relay is de-energized to provide an arc between the movable contact and the stationary contact as the movable contact is moved from the closed position to the open position.

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