Overload relay 6...25 A electronic motor protection Size S0 - 3RB3123-4QB0

Product Description

Siemens SIRIUS Overload Relay 6–25 A, Size S0, Class 5…30E – 3RB3123-4QB0

The Siemens 3RB3123-4QB0 is a SIRIUS electronic overload relay designed for reliable motor protection in the current range of 6 A to 25 A. It belongs to the 3RB3 series (Size S0) and is used to protect motors against overload, phase failure, and phase unbalance, ensuring safe and efficient operation in industrial motor control applications.

This relay is typically used in combination with Siemens contactors in motor control centers (MCC), pumps, compressors, conveyors, and industrial automation systems.

Key Features:

• Siemens SIRIUS 3RB3 series overload relay 

• Part Number: 3RB3123-4QB0 

• Current setting range: 6 – 25 A 

• Size: S0 frame 

• Trip class: Class 5 to Class 30 (adjustable) 

• Electronic motor protection relay (solid-state type) 

• Contactor mounting design 

• Screw terminal connection for main and auxiliary circuits 

• Manual / Automatic reset selectable 

• Internal phase failure and imbalance protection 

• Optional ground fault detection feature (depending on configuration) 

• Low power loss and high efficiency design