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Siemens 3RV2021-4NA25 S0 Motor Protection Circuit Breaker

Siemens 3RV2021-4NA25 S0 breaker with spring terminals & aux contacts.

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ManufacturerSiemens

Part number3RV2021-4NA25

Size S0

Class 10

A-release 23-28 A

N-release 364 A

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Veteran-owned

CAGE: 9NK75

Motor protection Adjustable current setting Spring-type terminals Standard switching capacity Class 10 rating Integrated auxiliary contacts

Product description

The Siemens 3RV2021-4NA25 is a Size S0 motor protection circuit breaker rated for Class 10. It features an adjustable A-release of 23 to 28 A and a short-circuit release of 364 A. This model includes spring-type terminals for efficient installation and transverse auxiliary switches (1 NO + 1 NC) for signaling and control, offering standard switching capacity.

This circuit breaker is suitable for motor protection applications that require both reliable tripping characteristics and auxiliary signaling capabilities. It is commonly applied in control panels for manufacturing equipment, material handling, and process automation systems.

Stanlo Automation, a veteran-owned supplier of industrial automation surplus, stocks the Siemens 3RV2021-4NA25. We are committed to providing quality parts and exceptional service to keep your operations running.

Technical specifications

Size	S0
Class	10
A-release	23-28 A
N-release	364 A
Terminals	Spring-type
Auxiliary Switches	1 NO + 1 NC
Switching Capacity	Standard

Common applications

Motor control

Industrial automation

Material handling

Process control

Manufacturing equipment

Signaling circuits

Compatible systems

Siemens Sirius 3RV2 series motor protection

Also known as

Siemens 3RV2 S0 breaker 3RV2021-4NA25 motor starter Siemens 23-28A circuit breaker spring aux

Replaces / compatible with

Replaces older Siemens motor protection circuit breakers in the S0 size with spring-type terminals and auxiliary contacts. Compatible with Siemens Sirius accessories.

Technical note

Expert tip

When using spring-type terminals, ensure the conductor insulation is stripped to the appropriate length to make contact with the spring clamp mechanism.

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Frequently asked questions

How are the auxiliary contacts attached to the 3RV2021-4NA25?

The auxiliary contacts for the Siemens 3RV2021-4NA25 are typically snap-on modules that attach to the side of the circuit breaker. This design allows for easy installation or removal without requiring specialized tools.