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Compared with a mechanical relay, the input and output control sections, made up of the IRED and PVD in the OC MOSFET, correspond to the function of the coil in the mechanical relay. They isolate the input from the output and generate the open or closed action on receipt of an input signal. Unlike a mechanical relay, an input coil catch diode is not required, as the inductor kick of the mechanical relay coil is not present. The output MOSFET in the SSR corresponds to the contact in the mechanical relay, opening and closing the load circuit.
PTM Published on: 2009-03-27
