Home › Manufacturers › Siemens › 3RV2021-4NA15

Siemens

Siemens 3RV2021-4NA15 S0 Motor Protection Circuit Breaker

Siemens 3RV2021-4NA15 S0 breaker with screw terminals & aux contacts.

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number3RV2021-4NA15

Size S0

Class 10

A-release 23-28 A

N-release 364 A

Get a price for 3RV2021-4NA15

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

Motor protection Adjustable current setting Screw terminals Standard switching capacity Class 10 rating Integrated auxiliary contacts

Product description

The Siemens 3RV2021-4NA15 is a Size S0 motor protection circuit breaker offering Class 10 protection. It includes an adjustable A-release range of 23 to 28 A and a short-circuit release of 364 A. This model is equipped with screw terminals and transverse auxiliary switches (1 NO + 1 NC) for integrated signaling and control functions, along with standard switching capacity.

This circuit breaker is ideal for motor protection where auxiliary contacts are needed for status monitoring or integration into control logic. Common applications include automated manufacturing lines, material handling systems, and HVAC systems.

Stanlo Automation, a veteran-owned distributor of industrial surplus parts, offers the Siemens 3RV2021-4NA15. We are dedicated to providing reliable components and excellent customer service.

Technical specifications

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

Common applications

Motor control

Industrial automation

Material handling

HVAC systems

Pump control

Machine monitoring

Compatible systems

Siemens Sirius 3RV2 series motor protection

Also known as

Siemens 3RV2 S0 breaker 3RV2021-4NA15 motor starter Siemens 23-28A circuit breaker with aux

Replaces / compatible with

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

Technical note

Expert tip

Auxiliary contact modules for the 3RV2 series are typically snap-on, ensuring easy installation and replacement.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the purpose of the auxiliary contacts on the 3RV2021-4NA15?

The 1 NO + 1 NC auxiliary contacts on the Siemens 3RV2021-4NA15 provide electrical signals for monitoring the state of the main circuit breaker. They can be used in control systems to indicate overload trips, ready status, or other operational conditions.