The SSM1D312BD is a modular solid-state relay from the Harmony series, intended for single-phase DC switching. It accepts a control input voltage from 4 to 32V DC to switch an output load of 1 to 100V DC with a rated current of 12A. Featuring a Mosfet output, this relay provides a low on-state resistance of 0.045 Ohms, a maximum voltage drop of less than 0.5V, and a very low off-state leakage current of 0.1 mA. Its compact, 18mm wide DIN rail mount package and green LED input status indicator make it ideal for integration into industrial control systems requiring reliable and fast DC load switching.