Siemens Timing relay with star-delta (wye-delta) function, 2NOProduct Overview The Siemens 3RP2576 1NW30 is a DIN rail mounted electronic timing relay from the SIRIUS 3RP25 series, configured for star delta (wye delta) motor starting circuits. It combines a delayed contact and an instantaneous contact to manage the switching sequence between star and delta connections, thereby enabling reduced voltage motor start up. The unit operates with a broad supply voltage range and is designed for compact control panels,