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Siemens 3RV2031-4DB15: S2 Motor Protection, Class 20, Aux. Switches

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ManufacturerSiemens

Part number3RV2031-4DB15

Size S2

Class 20

A-release 18-25 A

N-release 325 A

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Motor protection Adjustable overload protection (Class 20) Short-circuit protection Integrated auxiliary contacts Standard switching capacity Screw terminals

Product description

The Siemens 3RV2031-4DB15 is a Size S2 motor protection circuit breaker from the SIRIUS 3RV2 series, featuring a Class 20 thermal release for motors requiring a slower trip curve. It has an adjustable range of 18-25A and a short-circuit release (N-release) of 325A. This model includes transverse auxiliary switches with 1 NO and 1 NC contacts, providing essential signaling or interlocking capabilities for control systems. It is built for standard switching capacity.

This circuit breaker is ideal for protecting motors in demanding industrial applications, offering both overload and short-circuit protection along with integrated signaling functions. The Class 20 rating is beneficial for motors with high starting currents or longer acceleration times, reducing the risk of nuisance tripping. Its S2 frame size ensures a compact installation.

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Technical specifications

Size	S2
Class	20
A-release	18-25 A
N-release	325 A
Aux. Switches	1 NO+1 NC
Switching Capacity	Standard

Common applications

Industrial machinery

Motor control

Pump systems

Fan control

Applications with high starting current

Control panel integration

Compatible systems

Compatible with Siemens SIRIUS 3RV2 series components, including auxiliary switches and control modules.

Also known as

Siemens S2 Motor Protector with Aux 3RV2031-4DB15 Breaker SIRIUS 3RV2 Class 20 Aux

Replaces / compatible with

A direct replacement for Siemens S2 motor protection circuit breakers with auxiliary contacts, suitable for 18-25A applications.

Technical note

Expert tip

The integrated auxiliary contacts provide valuable feedback for PLC monitoring or control logic, enhancing system automation and diagnostics.

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Frequently asked questions

How do the auxiliary contacts on the Siemens 3RV2031-4DB15 function?

The Siemens 3RV2031-4DB15 is equipped with 1 NO and 1 NC auxiliary contacts. These contacts operate in parallel with the main switching mechanism and can be wired into control circuits for remote indication of the breaker's state or to implement safety interlocks within the automation system.