3RU2146-4FB1

This product is a Siemens SIRIUS 3RU2146 series S3 size thermal overload relay with a current adjustment range of 28 to 40A. It conforms to IEC standard Class 10 tripping characteristics and has one set of normally open and one set of normally closed auxiliary contacts. It can be installed and used independently of a contactor.

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Siemens SIRIUS 3RU2146-4FB1 Thermal Overload Relay 28-40A

Product Positioning

The Siemens SIRIUS 3RU2146-4FB1 is an S3-size thermal overload relay with an adjustable current range of 28 to 40A. It features a stand-alone mounting design and is suitable for control panel configurations that are not directly connected to the contactor.

Core Product Advantages and Features

S3 size current range

The current adjustment range is 28 to 40A, covering the rated current protection requirements of medium and large three-phase motors.

Individual installation design

Both the main circuit and the auxiliary circuit use screw terminals and can be installed independently on the control panel without the need to directly connect contactors.

Class 10 Escape Feature

It conforms to the IEC standard thermal operation curve, providing stable and reliable trip protection when the motor is overloaded.

Phase loss protection function

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

project	Specification
Current adjustment range	28–40 A
Frame size	S3
Break away from level	Class 10
Installation method	Install separately (not directly mounted contactor)
Main/Auxiliary Circuit Terminals	Screw terminals
Auxiliary contact	1 normally open + 1 normally closed

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