Siemens 3RA2811-1CW10 Electronic Timing Relay

Siemens 3RA2811-1CW10 Electronic Timing Relay is an ON-delay timer with a semiconductor output that snaps onto the front of Siemens contactors (3RT201/3RT202) and auxiliary contactors (3RH2). It accepts a 24–240 V AC/DC supply at 50/60 Hz and offers a timing range of 0.05–100 seconds, enabling precise delay control in motor starters, pumps, or lighting circuits. An integrated varistor suppresses coil transients, and wiring is via screw terminals for reliable installation. The solid-state output provides maintenance-free switching, with an electrical endurance up to 10,000,000 cycles at AC-15 and 230 V (typical). When the input is energised, the output activates after the set delay, supporting compact sequencing in control panels without mechanical contacts. This timing relay belongs to the SIRIUS 3RA28 family and is designed for use as a front-mount timer block in standard Siemens relay assemblies.