3RU1136-4HB0 | Siemens SIRIUS Motor Overload Protection Relay

Product Description

Product Overview

The Siemens 3RU1136-4HB0 is a SIRIUS thermal overload relay designed for dependable motor overload protection.
It protects three-phase motors against overload and phase failure, therefore reducing unplanned downtime and equipment damage.
Moreover, this relay integrates seamlessly with Siemens SIRIUS contactors to form compact and reliable motor starters.
Its mechanical simplicity and proven thermal design support long-term operation in demanding industrial environments.

Technical Specifications

• Manufacturer: Siemens AG

• Product Series: SIRIUS 3RU11

• Model: 3RU1136-4HB0

• Product Type: Thermal overload relay

• Rated Current Setting Range: 40–50 A

• Trip Class: Class 10

• Poles: 3-pole

• Auxiliary Contacts: 1 NO + 1 NC

• Reset Mode: Manual and automatic

• Phase Failure Sensitivity: Yes

• Switching Position Indication: Yes

• TEST Function: Yes

• STOP Button: Yes

• Terminal Type: Cage Clamp / Screw terminals

• Mounting Method: Direct mounting on SIRIUS contactors

• Rated Insulation Voltage (Ui): Up to 690 V AC

• Impulse Withstand Voltage (Uimp): 6 kV

• Operating Temperature: –25 °C to +60 °C

• Compliance: IEC 60947-4-1, UL, CSA, RoHS

FAQ

Q1: What current range does the Siemens 3RU1136-4HB0 support?
The adjustable current setting range is 40 to 50 amperes.

Q2: Does this relay protect against short circuits?
No, short-circuit protection must be provided using fuses or circuit breakers.

Q3: Can this relay detect phase failure?
Yes, it includes integrated phase failure sensitivity for three-phase motor protection.

Q4: Is manual testing possible after installation?
Yes, the built-in TEST slide allows functional testing without disconnecting the load.

Q5: Which contactors are compatible with this relay?
It is designed for direct mounting on Siemens SIRIUS 3RT series contactors.