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Siemens 3RV2421-4DA15 S0 Transformer Protection Circuit Breaker

Siemens 3RV2421-4DA15 Size S0 circuit breaker with auxiliary switches.

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ManufacturerSiemens

Part number3RV2421-4DA15

Size S0

For transformer protection Yes

A-release 18...25 A

N-release 400 A

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Veteran-owned

CAGE: 9NK75

Transformer protection Adjustable overload protection Fixed short-circuit release (N-release) Screw terminals Standard switching capacity Size S0 Transverse auxiliary switches (1 NO+1 NC)

Product description

The Siemens 3RV2421-4DA15 is a Size S0 circuit breaker designed for transformer protection, featuring built-in transverse auxiliary switches (1 NO + 1 NC). It offers an adjustable A-release (overload) from 18 to 25 Amps and an N-release (short-circuit) of 400 Amps. This breaker uses screw terminals and provides standard switching capacity.

This model is ideal for applications requiring both transformer protection and signal indication or control logic integration. The auxiliary contacts can be used for remote signaling of breaker status or for interlocking control circuits.

Stanlo Automation, a veteran-owned surplus industrial parts distributor, offers the Siemens 3RV2421-4DA15. We provide reliable, cost-effective solutions for your automation needs, ensuring operational efficiency and continuity.

Technical specifications

Size	S0
For transformer protection	Yes
A-release	18...25 A
N-release	400 A
Terminals	Screw terminal
Switching capacity	Standard
Auxiliary Switches	1 NO + 1 NC

Common applications

Transformer protection

Industrial automation

Control panels

Machine building

Systems with status signaling

Power distribution

Compatible systems

Siemens Sirius 3RV2 Siemens 3RV2 accessories

Also known as

Siemens 3RV24214DA15 Siemens S0 transformer breaker with aux Siemens 18-25A breaker with contacts

Replaces / compatible with

Compatible with Siemens Sirius 3RV2 series accessories.

Technical note

Expert tip

The auxiliary switches offer a reliable way to integrate the breaker's operational status into a PLC or control system, enhancing monitoring capabilities.

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Frequently asked questions

What functionality do the auxiliary switches on the 3RV2421-4DA15 provide?

The Siemens 3RV2421-4DA15 is equipped with transverse auxiliary switches (1 Normally Open, 1 Normally Closed). These contacts can be wired into control circuits to provide remote indication of the breaker's status (tripped or closed) or to implement safety interlocks.