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.
Product Positioning
The 3RB3123-4QB1 is a high-current S0 specification electronic overload relay in the Siemens SIRIUS 3RB3 series, with current settings ranging from 6 to 25A, suitable for the protection needs of three-phase motors with larger currents.
Core Product Advantages and Features
6 to 25A current setting range
Compared to the 3 to 12A models in the same series, it covers a wider current range and is suitable for the protection of medium-sized three-phase motors.
Class 5 to 30 adjustable skip levels
An appropriate trip curve can be selected based on the motor's starting characteristics, balancing protection sensitivity and starting stability.
Electronic microprocessor detection
By replacing the traditional bimetallic strip with an electronic circuit, the reaction speed is fast and the jumping accuracy is high.
Contactor assembly installation design
It can be directly assembled onto S0 specification contactors, saving control box wiring and installation space.
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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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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.
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