FOTEK SSR-40-DA Solid State Relay

The FOTEK SSR-40-DA Solid State Relay is a semiconductor device designed to switch alternating current loads up to 40 Amperes using a low-voltage direct current control signal. Operating with an input voltage range of 3 to 32 volts DC, this zero-cross switch provides noise-free transitions ideal for sensitive industrial equipment and process automation systems. The unit accommodates AC load voltages between 24 and 380 volts, making it versatile for heating elements, lighting control, and general-purpose circuit protection tasks. Because solid-state relays generate significant heat during conduction, proper installation on a suitable heat sink is mandatory to ensure consistent thermal performance and prevent component failure. With non-mechanical contacts, this relay eliminates the mechanical wear associated with electromechanical switches, providing extended service life in environments where rapid cycling is common.