3RB3123-4SE0

The Siemens SIRIUS 3RB3123-4SE0 electronic overload relay has a current setting range of 3 to 12A, is S0 standard, features spring-loaded terminal wiring, manual/automatic reset, and built-in ground fault detection, and is suitable for the protection of small motors.

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Siemens 3RB3123-4SE0 SIRIUS Electronic Overload Relay Spring Terminal Product Image

Product Positioning

The 3RB3123-4SE0 is an electronic overload relay from the Siemens SIRIUS 3RB3 series. Both the main and auxiliary circuits use spring-loaded terminals for quick wiring, making it suitable for automated panels that require screwless wiring.

Core Product Advantages and Features

Spring-loaded terminal quick-connect

Both the main circuit and the auxiliary circuit use spring-loaded terminals, which saves time in wiring and reduces the risk of loosening.

3 to 12A current fine-tuning range

Suitable for overload protection of small three-phase motors, the trip value can be accurately set according to the actual rated current.

Built-in ground fault detection

Grounding anomalies are detected using 0.75 times the motor current as a benchmark, improving the safety of the motor and personnel.

Manual/Automatic Reset Dual Mode

Supports panel button reset and 24VDC remote reset, making maintenance and troubleshooting more flexible.

project	Specification
Current setting range	3～12 A
Size Specifications	S0
Break away from level	Class 5E, 10E, 20E, 30E adjustable
Terminal type	Spring-loaded terminals (main circuit/auxiliary circuit)
Reset method	Manual/automatic selectable, remote reset also supported.
Installation method	Contactor direct assembly installation

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