Arc discharge preventing circuit of transfer switch for use with

Details Arc discharge preventing circuit of transfer switch for use with Arc discharge preventing circuit of transfer switch for use with

1979-04-02

1981-07-21

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 5, 361 31, 318DIG2, 318443, H02P 104

Patent

active

042801605

ABSTRACT:
A motor is energized by a source through first and second transfer switches. Each transfer switch is operated by a switching transistor. The switching transistor for the first transfer switch is driven by a drive signal while the switching transistor for the second transfer switch is driven by the output of a delay circuit responsive to an excessively large current flowing through the motor. A self-holding switch is provided to connect the motor to the source through the second transfer switch.

REFERENCES:
patent: 2159298 (1939-05-01), Stansbury
patent: 3611094 (1971-10-01), Bischoff
patent: 3691443 (1972-09-01), Hammer et al.
patent: 3919612 (1975-11-01), Ratzel et al.

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