3RU1146-4FB0

The Siemens SIRIUS 3RU1146-4FB0 thermal overload relay features an S3 frame, Class 10 operating rating, and a current setting range of 28~40 amps. It can be directly mounted on 3RT1044~1046 series contactors, providing overload and phase loss protection. It is suitable for medium and large three-phase motor circuits.

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Siemens 3RU1146-4FB0 SIRIUS thermal overload relay (28-40A, S3 type frame)

Product Positioning

The 3RU1146-4FB0 is a Siemens SIRIUS 3RU11 series S3 type frame thermal overload relay with a current setting range of 28~40 amps. It is suitable for use with 3RT1044~1046 contactors for circuit protection of medium and large motors.

Core Product Advantages and Features

S3 frame direct installation

It can be directly mounted on 3RT1044, 3RT1045, and 3RT1046 contactors, eliminating the need for additional wiring space.

Class 10 Action Level

Compliant with IEC standard level 10 trip characteristics, providing reliable motor overload protection under normal starting conditions.

Overload and phase loss protection

It can detect three-phase imbalance and phase loss, preventing the motor from burning out due to single-phase operation.

Manual/Automatic Reset

After disconnection, manual or automatic reset can be selected to meet the maintenance needs of different production lines.

project	Specification
Current setting range	28~40 A
Frame size	S3
Action Level	Class 10
Applicable contactors	3RT1044, 3RT1045, 3RT1046
Terminal type	Both the main circuit and auxiliary circuit use screw terminals.

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