Thermal relays particularly for starting single-phase...

Details Thermal relays particularly for starting single-phase... Thermal relays particularly for starting single-phase...

H - Electricity

02

H

347/1, 26/120, 3

H02H 7/08 (2006.01) H01H 11/00 (2006.01) H01H 61/00 (2006.01)

Patent

CA 1132696

Abstract of the Disclosure A motor starting relay particularly adapted for use in starting single phase asynchronous motors comprises a re- sistor element of positive temperature coefficient of resistivity which is compactly arranged within a housing and engaged by electrical contact and terminals means of particular structure and of a material of relatively high thermal resistance in a novel way such that power dissipation or loss by the resistor is reduced to a very low level after it has performed its motor starting fuction but so that, at the same time, the resistor is adapted to cool more rapidly after interruption of motor opera- tion to permit prompt motor restarting.

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