Single piece package SSR-40VA solid state relay, rated load current 40A, voltage regulation type controlled by external potentiometer; Output supports AC 24V to 380V wide range alternating current load, suitable for voltage speed and temperature regulation equipment; No mechanical contact, silent operation, anti-vibration, long service life, no electric arc spark during switching; Compact integrated module design, convenient DIN rail installation, good heat dissipation base reserved for additional cooling heatsink; Widely compatible with temperature controllers, light dimmers, small motor speed regulation, industrial heating tube control circuits