Siemens 3RU1136-4DB0 Relay

Siemens 3RU1136-4DB0 is a Sirius thermal overload relay sized for the S2 footprint that provides motor protection by monitoring current in the main circuit and tripping the linked 3RT contactor when an overload is detected. It is rated for 18–25 A (Class 10) and designed for contactor mounting with Siemens 3RT series devices; it features 1NO+1NC auxiliary contacts and screw-terminal connections for both the main circuit and the auxiliary circuit. The relay supports manual or automatic reset, enabling flexible restart after a fault. It is rated for insulation up to 690 V AC, with IP20 front protection and 8 g/10 ms shock resistance. The 3RU1136-4DB0 is commonly paired with 3RT contactors such as 3RT1033, 3RT1034, 3RT1035, and 3RT1036, and corresponds to a typical motor rating around 11 kW at standard voltages.