Solid state relay

Details Solid state relay Solid state relay

H - Electricity

02

H

348/36

H02H 3/093 (2006.01) H01H 47/18 (2006.01)

Patent

CA 1125902

ABSTRACT OF THE DISCLOSURE A solid state relay for interrupting current flow in a power distribution circuit is disclosed. The relay includes a long time delay circuit which generates a first trip signal when the magnitude of the peak in- stantaneous line current rises above a pickup value I1 for a time period which varies as an inverse function of the magnitude of the peak instantaneous time current and which is determined by a first predetermined time current characteristic curve. The first predetermined time current characteristic curve defines the desired operating characteristic of the relay over a first current range extending between the pickup current I1 and the higher current I2. The predetermined time current characteristic curve is determined by a multi-node RC element in the feed back loop of an operational amplifier which forms part of the long time delay circuit.

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