Circuit protection arrangement

Details Circuit protection arrangement Circuit protection arrangement

2005-03-01

2005-03-01

Salata, Jonathan (Department: 2837)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

C338S048000, C338S0220SD

Reexamination Certificate

active

06862164

ABSTRACT:
A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature Ts1, has a resistance at 20° C. R1, has a hold current at a first specified temperature IH1, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature Ts2which is less than Ts1, has a resistance at 20° C. R2which is less than R1, has a hold current at the first specified temperature IH2which is greater than IH1, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes. IH1equals IH2at a critical temperature Tcrit, such that at temperatures below Tcrit, the first PTC device switches into a high resistance state and the circuit protection arrangement is resettable, and at temperatures greater than Tcrit, the second PTC device switches into a high resistance state and initiates an action causing the circuit protection arrangement to permanently open.

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