The Logic instruments Solid State Relay accept DC voltage ( 4-32 VDC) , Variable current ( 4-20 mA), AC Voltage( 12-230VAC), Variable ohms ( 0-470 K). The SSR/PPC soft start , no noise Long life work , use proper heat sink avoid rejection. The SSR work ON /OFF mode function only controlled by controller suitable for heater application, the phase angle regulator (PPC)regulate the Voltage suitable for Power variable application that is controlled by pid controller provided Variable current (4-20mA)output suitable for high accuracy heat control The instrument is housed In a compact PVC case . maximum Load capacity 100A single phase , three phase optional.