Circuit protection devices comprising ptc element

Details Circuit protection devices comprising ptc element Circuit protection devices comprising ptc element

H - Electricity

02

H

317/12.4

H02H 9/02 (2006.01) H01C 7/02 (2006.01) H02H 9/04 (2006.01)

Patent

CA 1177527

157/112 MP0713 ABSTRACT ABRIDGEMENT The invention relates to circuit protection devices which comprise conductive polymer PTC elements. the devices of the invention will provide repeated protection against sudden increases in current to high levels, e.g. 5 amps or more, in circuits which operate at, or are subject to fault conditions arising from, voltages greater than 100 volts, e.g. mains supply voltages. A particularly valuable use of the devices is in the protec- tion of circuitry in telecommunication apparatus which normally operates at battery voltages, e.g. up to 75 volts, but which can be accidentally subject to voltages above 120 volts. -2-

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