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Siemens 3RV2421-4BA10 S0 Transformer Protection Circuit Breaker

Siemens 3RV2421-4BA10 Size S0 circuit breaker for transformer protection.

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ManufacturerSiemens

Part number3RV2421-4BA10

Size S0

For transformer protection Yes

A-release 13...20 A

N-release 325 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

Product description

The Siemens 3RV2421-4BA10 is a Size S0 circuit breaker designed for transformer protection. It features an adjustable A-release (overload) from 13 to 20 Amps and an N-release (short-circuit) of 325 Amps. This model uses screw terminals and offers standard switching capacity.

This circuit breaker is suitable for protecting transformers in demanding industrial applications. Its specific release settings are tailored for transformer duty, ensuring reliable protection against both sustained overloads and sudden short circuits.

Stanlo Automation, a veteran-owned surplus distributor, provides the Siemens 3RV2421-4BA10. We are dedicated to supplying quality industrial automation parts to meet your operational needs, offering value and reliability.

Technical specifications

Size	S0
For transformer protection	Yes
A-release	13...20 A
N-release	325 A
Terminals	Screw terminal
Switching capacity	Standard

Common applications

Transformer protection

Industrial control panels

Power distribution

Automation systems

Machinery

Manufacturing

Compatible systems

Siemens Sirius 3RV2 Siemens 3RV2 accessories

Also known as

Siemens 3RV24214BA10 Siemens S0 transformer breaker Siemens 13-20A breaker

Replaces / compatible with

Compatible with Siemens Sirius 3RV2 series accessories.

Technical note

Expert tip

The N-release of 325A provides a higher instantaneous trip point, suitable for circuits where inrush currents are not a primary concern for nuisance tripping.

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Frequently asked questions

What is the difference between A-release and N-release on this breaker?

The A-release on the 3RV2421-4BA10 is the adjustable thermal overload protection (13-20A), designed for slower, sustained overcurrents. The N-release is the fixed short-circuit magnetic protection (325A), which trips instantaneously on very high fault currents.