3RP25 Timing Relays Siemens 3RP25 Multifunctional Timing Relays feature up to 27x functions and a 12VAC/DC to 240VAC/DC voltage range, making the series ideal for time-delayed switching. Siemens 3RP25 Multifunctional Timing Relays are designed to serve a wide range of applications worldwide. These compact devices come in 17.5mm and 22.5mm width versions and feature removable terminals and wiring.