Siemens 3RU1136-4AB0 Overload Relay

The Siemens 3RU1136-4AB0 is a SIRIUS thermal overload relay that provides motor protection by monitoring current in three-phase circuits; it is designed for direct mounting on Siemens 3RT contactors in size S2 (models 3RT1033–1036), with a rated current of 11–16 A and Class 10 thermal performance. This relay features a dual contact configuration (1NO+1NC), with manual or automatic reset options, and both main and auxiliary circuits terminate at screw terminals for straightforward wiring. It offers an insulation voltage of up to 690 V and an IP20-rated housing, with a typical power loss of about 9 W and a weight around 0.16 kg, making it a compact, efficient protection device for motor starters. In operation, the 3RU1136-4AB0 also provides phase-loss protection and is intended to be used as part of the motor protection scheme with Siemens SIRIUS contactors; its 11–16 A range covers medium-size motors, helping prevent damage from overload conditions.