3RB2153-4FX2

The 3RB2153-4FX2 is a solid-state overload relay from the SIRIUS 3RB21 standard series. It has an adjustable current range of 50~200A, is suitable for S6 housings, and features a through-type current transformer wiring for the main circuit and spring terminals for the auxiliary circuit. It also has built-in ground fault detection and manual/automatic reset.

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Siemens 3RB2153-4FX2 SIRIUS 3RB21 Solid State Overload Relay

Product Positioning

The 3RB2153-4FX2 is a solid-state overload relay from the Siemens SIRIUS 3RB21 standard series. It has an adjustable current range of 50~200A, a through-type current transformer wiring design for the main circuit, and a built-in ground fault detection function. It is suitable for motor protection applications that require flexible wiring.

Core Product Advantages and Features

Through-type current transformer wiring

The main circuit adopts a through-feed current transformer design, which provides high wiring flexibility.

Spring-type auxiliary terminal

The auxiliary circuit uses spring terminal connections, which are quick to install and provide stable contact.

Built-in ground fault detection

It has an internal grounding fault detection function, which enhances the protection against abnormal motor circuits.

Escape level adjustable from 5 to 30E

The tripping level can be adjusted according to the motor's starting characteristics to adapt to light to heavy load starting.

project	Specification
Current adjustment range	50~200 A
Applicable housing	S6
Break away from level	CLASS 5~30E (Adjustable)
Main circuit connection method	Through-type current transformer
Ground fault detection	built-in

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