Overcurrent protection systems

Details Overcurrent protection systems Overcurrent protection systems

1999-03-29

2000-08-15

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 9, 361 94, 361106, 361166, 361187, 361 935, 361 936, H02H 300

Patent

active

061045837

ABSTRACT:
An overcurrent protection system containing (1) a current sensing means; (2) a first switch coupled to the current sensing means; (3) a voltage sensing means; (4) a PTC device; and (5) a second switch coupled to the voltage sensing means. In one type of system, the second switch is connected in series with a parallel combination of the first switch and the PTC device; and the voltage sensing means is connected in parallel with a series combination of (i) the second switch and (ii) the parallel combination of the first switch and the PTC device. In another type of system, the first switch, the PTC device and the voltage sensing means are connected in parallel with each other; and the second switch (i) is a switch which latches in the open position and (ii) is connected in series with the parallel combination of the first switch, the PTC device and the voltage sensing means.

REFERENCES:
patent: 4012669 (1977-03-01), Gelfand et al.
patent: 5666244 (1997-09-01), Thomas et al.
patent: 5689395 (1997-11-01), Duffy et al.
patent: 5737160 (1998-04-01), Duffy
patent: 5831803 (1998-11-01), Wynn et al.

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