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Siemens 3RV2021-4FA15 S0 Motor Protection Circuit Breaker

Siemens 3RV2021-4FA15 S0 motor protection breaker with aux contacts.

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ManufacturerSiemens

Part number3RV2021-4FA15

Size S0

Class 10

A-release 34-40 A

N-release 480 A

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Veteran-owned

CAGE: 9NK75

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

Product description

The Siemens 3RV2021-4FA15 is a Size S0 motor protection circuit breaker with Class 10 rating. It offers an adjustable A-release from 34 to 40 A and an N-release of 480 A. This model is equipped with screw terminals and includes transverse auxiliary switches (1 NO + 1 NC) for signaling and control purposes, alongside standard switching capacity.

This unit is ideal for applications requiring both motor protection and auxiliary signaling. It is commonly used in control systems for industrial machinery, conveyors, and pump stations where integrated auxiliary contacts simplify wiring and reduce component count.

Stanlo Automation, a veteran-owned supplier of industrial automation surplus, carries the Siemens 3RV2021-4FA15. Trust us for reliable parts and efficient service to keep your facility operational.

Technical specifications

Size	S0
Class	10
A-release	34-40 A
N-release	480 A
Terminals	Screw
Auxiliary Switches	1 NO + 1 NC
Switching Capacity	Standard

Common applications

Motor control

Industrial automation

Conveyor systems

Pump control

Machine tools

Signaling circuits

Compatible systems

Siemens Sirius 3RV2 series motor protection

Also known as

Siemens 3RV2 S0 breaker 3RV2021-4FA15 motor starter Siemens 34-40A 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

The auxiliary contacts are mounted transversely to the main breaker unit and require proper alignment for engagement.

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Frequently asked questions

What function do the auxiliary contacts on the 3RV2021-4FA15 serve?

The 1 NO + 1 NC auxiliary contacts on the Siemens 3RV2021-4FA15 are used for signaling and control purposes. They can be wired into control circuits to indicate the status of the main circuit breaker or to interface with other control components.