Siemens 3RA2812-1DW10 is a solid-state, off-delay time relay that mounts to the front of Siemens 3RT2 contactors. It operates from an auxiliary supply and provides a semiconductor output for time-delayed control, with a time range of 0.05 to 100 seconds and a supply voltage of 24–240 V AC/DC at 50/60 Hz. An integrated varistor suppresses coil transients, and the unit uses screw terminals for reliable wiring, designed to snap onto front-mounted 3RT2 contactors (3RT201/3RT202) and auxiliary contactors 3RH2. As part of the 3RA28 family, it enables precise timing in applications such as control, starting, protection, and regulation circuits.
