Circuit and method for wetting relay contacts

Details Circuit and method for wetting relay contacts Circuit and method for wetting relay contacts

2006-08-10

2009-08-11

Enad, Elvin G (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

With arc-suppression or extinguishing means

C335S078000

Reexamination Certificate

active

07573360

ABSTRACT:
A circuit for wetting relay contacts includes a relay having a relay coil, a movable contact and a stationary contact. The movable contact is movable between an open position and a closed position upon energizing of the relay coil, and the movable contact engages the stationary contact in the closed position. The movable contact is moved from the closed position to the open position when the relay coil is de-energized. A transistor is connected to the relay coil through a load, wherein the transistor loads the relay coil after the relay coil 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.

REFERENCES:
patent: 5534178 (1996-07-01), Bailly et al.
patent: 5675238 (1997-10-01), Asao
patent: 5714731 (1998-02-01), Ulrich et al.

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