Electric switching surge protection

Details Electric switching surge protection Electric switching surge protection

H - Electricity

02

H

317/13

H02H 9/04 (2006.01) H02H 9/00 (2006.01)

Patent

CA 1194539

ABSTRACT An electric switching surge protector comprising a non-linear, voltage and frequency sensitive RC network connectable between earth and a phase of a switch controlled; AC electric load circuit. The RC network includes a linear resistance component; a non-linear resistance component connected in parallel with the linear resistance component and having a pre-determined knee-point voltage value; and a capacitance component connected in series with the parallel connected linear and non-linear resistance components. The capacitance components is operative to decouple the resistance components from the circuit at power supply frequent but to couple the combined resistive impedance of the parallel connected linear and non-linear resistance components effectively into the circuit under high frequency conditions. The capacitance component is further operative to increase the rise time of that portion of a steep fronted surge which exceeds the knee-point voltage value of the non-linear resistance component. - 1 -

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