Circuit and method for automatically resetting a solid state rel

Details Circuit and method for automatically resetting a solid state rel Circuit and method for automatically resetting a solid state rel

1995-07-28

1997-08-12

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 59, 361 71, H02H 500

Patent

active

056571941

ABSTRACT:
A reset circuit for an overload relay includes a timing circuit coupled to a switching circuit for automatically resetting the relay a predetermined time after a trip. The timing circuit includes a capacitor and a resistor in parallel with a reset coil. The capacitor is charged during normal operation and begins to discharge through the resistor following a trip at a first rate determined by the size of the resistor. The switching circuit includes a pair of transistors, a pair of capacitors and a pair of resistors. When the capacitor in the timing circuit has discharged a predetermined amount following a trip, the switching circuit is triggered and couples the capacitor to ground through one of the transistors, causing a rush of current through the reset coil sufficient to reset the relay.

REFERENCES:
patent: 5319514 (1994-06-01), Walsh et al.
patent: 5332986 (1994-07-01), Wieloch

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