3RU2126-4FB0
The Siemens SIRIUS 3RU2126-4FB0 thermal overload relay is an S0 frame series model with an upper current limit, an adjustment range of 34 to 40 amps, and screw terminals that can be directly mounted to the contactor. It is suitable for the protection of three-phase motors with a maximum current of 18.5 kW.
Product Positioning
The Siemens SIRIUS 3RU2126-4FB0 is an S0 frame series model with an upper current limit, adjustable from 34 to 40 amps. It is directly mounted to the contactor via screw terminals and is compatible with 18.5 kW three-phase motor protection.
Core Product Advantages and Features
34-40A high current setting
Covering the highest current range of the S0 frame series, it is suitable for motor circuits with large current loads.
Contactor directly mounted on the front
No additional adapters are required; the motor starter unit can be directly assembled.
Class 10 Action Characteristics
Designed according to IEC standard thermal action curves, it balances start-up tolerance and overload protection response speed.
Manual/Automatic Reset Switch
Depending on the on-site management needs, users can choose to manually confirm or automatically resume operation after disconnection.
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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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3RU2126-4EC1
The Siemens SIRIUS 3RU2126-4EC1 thermal overload relay features an S0 frame, a current adjustment range of 27 to 32 amps, spring-loaded screwless terminals, and independent mounting, eliminating the need for direct mounting to the contactor and enabling quick wiring.
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3RU2126-4EB1
The Siemens SIRIUS 3RU2126-4EB1 thermal overload relay features an S0 frame, a current adjustment range of 27 to 32 amps, screw terminals, and independent mounting. It can be individually fixed according to the space requirements of the distribution panel and is a non-contact wall-mounted model.