Overload protection device

Details Overload protection device Overload protection device

1994-11-15

1996-07-02

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 89, H02H 704

Patent

active

055328954

ABSTRACT:
An overload protection device is to be used in a current-carrying circuit which includes an AC power source and at least one load. The overload protection device includes a resistor, a transformer and a control circuit. The resistor is to be connected to the AC power source and the load so as to interconnect the AC power source and the load. The transformer has a primary winding connected across the resistor and further has a secondary winding. The control circuit is connected to the secondary winding of the transformer, and includes a switch unit that is to be connected to the AC power source and the load so as to interconnect normally the AC power source and the load. The switch unit disconnects the load from the AC power source when voltage at the secondary winding of the transformer reaches a predetermined overload voltage.

REFERENCES:
patent: 3868549 (1975-02-01), Schaefer et al.
patent: 4027203 (1977-05-01), Moran et al.
patent: 4358810 (1982-11-01), Wafer et al.

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