Overcurrent protection circuits comprising combinations of PTC d

Details Overcurrent protection circuits comprising combinations of PTC d Overcurrent protection circuits comprising combinations of PTC d

1995-11-29

1999-01-26

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361105, 361106, 361 10, H02H 300

Patent

active

058644580

ABSTRACT:
Electrical circuit protection arrangements with PTC devices and mechanical switches. The combinations of this invention permit the use of mechanical switches and PTC devices to switch voltages and currents in normal circuit operations, wherein the voltage and/or current ratings of the mechanical switches and PTC devices are much less than the normal operating voltages and currents of the circuits. This feature permits the use of smaller and less expensive mechanical switches and PTC device than would otherwise be required in such circuits. The arrangements of switches and PTC devices also permit the PTC devices to limit the magnitude of the fault current passed to the circuit.

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