3RU2126-4NB0

The Siemens SIRIUS 3RU2126-4NB0 thermal overload relay features an S0 frame, a current adjustment range of 23 to 28 amps, and screw terminals for direct mounting to the contactor. It also provides phase loss protection and is suitable for overload protection of approximately 15 kW three-phase motors.

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Siemens SIRIUS 3RU2126-4NB0 Thermal Overload Relay 23-28A

Product Positioning

The Siemens SIRIUS 3RU2126-4NB0 has a current adjustment range of 23 to 28 amps and is an S0 frame screw terminal direct mounting type thermal overload relay, which is suitable for overload protection of approximately 15 kW three-phase motors.

Core Product Advantages and Features

23-28A Precision Adjustment

The rotary current setting can be finely adjusted between 23 and 28 amps to match the actual full-load current of the motor.

S0 frame direct mounting

It can be directly assembled onto the front of the corresponding S0 frame contactor to form a complete motor starting assembly.

Phase loss protection function

When any phase current is abnormally lost, a trip can be triggered to protect the motor windings from damage.

1NO+1NC auxiliary contact

It provides trip warning and interlock control signals, making it easy to connect control circuits and warning lights in series.

project	Specification
Current adjustment range	23...28 A
Frame size	S0
Break away from level	Class 10
Motor power (400V reference)	15 kW
Auxiliary contact	1 NO + 1 NC
Terminal type	Screw terminals/contactors directly mounted

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