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.

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Siemens SIRIUS 3RU2146-4FB0 Thermal Overload Relay 28-40A

Product Positioning

The Siemens SIRIUS 3RU2146-4FB0 is an S3-size thermal overload relay with a current adjustment range of 28 to 40A. It can be directly connected to the SIRIUS 3RT204 series contactor to form an integrated motor starting protection combination.

Core Product Advantages and Features

Direct mounting

It can be directly mounted on SIRIUS 3RT204 series contactors, eliminating the need for additional wiring and installation space.

28-40A current range

The rotary current scale allows for precise setting of the trip value according to the motor's rated current.

Class 10 Escape Feature

It conforms to the IEC 60947-4-1 standard heat accumulation operation curve, protecting the motor from damage due to overload.

Manual/Automatic Reset

After disconnection, you can choose between manual or automatic reset mode to meet the needs of different production lines.

project	Specification
Current adjustment range	28–40 A
Frame size	S3
Break away from level	Class 10
Installation method	Directly mounted contactor (3RT204 series)
Main/Auxiliary Circuit Terminals	Screw terminals
Auxiliary contact	1 normally open + 1 normally closed

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