3RB3123-4SB0

The Siemens SIRIUS 3RB3123-4SB0 electronic overload relay has a current setting range of 3 to 12A, is S0 specification, uses screw terminal wiring, and features manual/automatic reset and built-in ground fault detection. It is suitable for direct mounting with contactors.

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Siemens 3RB3123-4SB0 SIRIUS Electronic Overload Relay Screw Terminal Product Image

Product Positioning

The 3RB3123-4SB0 is the screw terminal version of the Siemens SIRIUS 3RB3 series electronic overload relay. Like the spring-loaded 3RB3123-4SE0, it belongs to the 3 to 12A current rating and is available for different wiring habits.

Core Product Advantages and Features

Screw terminal wiring method

Both the main circuit and the auxiliary circuit use traditional screw terminals, which conforms to the existing wiring construction habits of most companies.

3 to 12A current fine-tuning range

The trip value can be precisely set according to the actual rated current of the motor, making it suitable for the protection of small three-phase motors.

Built-in ground fault detection

Electronic detection technology monitors grounding anomalies in real time, enhancing the safety of motors and power distribution systems.

Contactor direct assembly installation

It can be directly installed on S0 specification contactors, saving internal installation space in the control box.

project	Specification
Current setting range	3～12 A
Size Specifications	S0
Break away from level	Class 5E, 10E, 20E, 30E adjustable
Terminal type	Screw terminals (main circuit/auxiliary circuit)
Reset method	Manual/Automatic Selectable
External dimensions	Approximately 113×60×98 mm

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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.

3RB3123-4QB1

The Siemens SIRIUS 3RB3123-4QB1 electronic overload relay has a current setting range of 6 to 25A, is S0 rated, and has adjustable tripping levels from Class 5 to 30. It is suitable for overload protection applications of three-phase motors in combination with contactors.

3RB3123-4QB0

The Siemens SIRIUS 3RB3123-4QB0 electronic overload relay has a current setting range of 6 to 25A, is S0 specification, uses screw terminal wiring, has built-in ground fault detection, and a rated insulation voltage of 690V. It is suitable for three-phase motor protection.