3RU2136-4RB0

The Siemens SIRIUS 3RU2136-4RB0 is an S2-size thermal overload relay with a current range of 70 to 80 A, the highest current rating in its series. It can be directly connected to the 3RT203 series contactor and features manual/automatic reset switching.

Share To

Siemens SIRIUS 3RU2136-4RB0 Thermal Overload Relay 70-80A

Product Positioning

The Siemens SIRIUS 3RU2136-4RB0 is an S2-size thermal overload relay with a current adjustment range of 70 to 80A. It is the highest current specification model in the 3RU2136 series and can be directly connected to the SIRIUS 3RT203 contactor.

Core Product Advantages and Features

70-80A high current specification

This model has the highest current adjustment range in the S2 frame series and is suitable for larger power three-phase motors.

Direct mounting

It can be directly mounted on SIRIUS 3RT203 series contactors to form a compact starting protection unit.

Phase loss sensitive detection

It features three-phase phase loss and imbalance detection to prevent the motor from overheating and being damaged due to single-phase operation.

Class 10 Breakthrough Level

It conforms to the IEC standard heat buildup jump curve, combining fast response speed with protective stability.

project	Specification
Current adjustment range	70–80 A
Frame size	S2
Break away from level	Class 10
Installation method	Directly mounted contactor (3RT203 series)
Auxiliary contact	1 normally open + 1 normally closed
Reset method	Manual/Automatic Selectable

Recommend

3RU2146-4FB0

The Siemens SIRIUS 3RU2146-4FB0 is an S3-size thermal overload relay with a current range of 28 to 40 A. It is designed for direct mounting on the 3RT204 series contactor, simplifying installation space and facilitating wiring. It complies with IEC three-phase motor protection standards.

3RU2136-4QB1

The Siemens SIRIUS 3RU2136-4QB1 is an S2-size thermal overload relay with a current range of 47 to 57 A. Its stand-alone design eliminates the need for direct contactor mounting, making it suitable for control panel layouts with separate wiring.

3RU2136-4QB0

The Siemens SIRIUS 3RU2136-4QB0 is an S2-size thermal overload relay with a current range of 47 to 57 A. It can be directly connected to the 3RT203 series contactor. Both the main and auxiliary circuits use screw terminals and comply with IEC motor protection standards.