3RV2421-4CA20

The Siemens 3RV2421-4CA20 is an S0 size three-pole circuit breaker with an A-operation overload range of 17...22A, a N-operation short-circuit trip fixed 364A, a rated current of 22A, a 400V breaking capacity of 55kA, and is suitable for the protection of small transformer circuits.

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Product image of Siemens 3RV2421-4CA20 SIRIUS 3RV2 S0 transformer protection circuit breaker

Product Positioning

The 3RV2421-4CA20 is a SIRIUS 3RV2 series S0 size transformer protection circuit breaker with an A-operation overload range of 17...22A, suitable for short circuit and overload protection of small transformer circuits.

Core Product Advantages and Features

Precise overload adjustment range

The adjustable range of A is 17...22A, which is slightly narrower than that of the 4CA10 in the same series, making it convenient to set it accurately for specific transformer capacities.

Fixed short-circuit trip value

The N-operation short-circuit trip value is 364A, which can withstand the instantaneous magnetizing surge when the transformer is closed without causing malfunction.

S0 size high blocking capacity

With a breaking capacity of 55kA at 400V, it is suitable for general industrial low-voltage switchboards.

Three-level standardization structure

The three-pole main circuit design allows for installation on a 35mm DIN rail, making installation and maintenance convenient.

project	Specification
model	3RV2421-4CA20
series	SIRIUS 3RV2
Casing size	S0
use	Transformer Protection
A. Action (Overload) Adjustment Range	17...22 A
N-action (short circuit) trip value	364 A
Rated current	22 A
Rated insulation voltage	690 V
Interrupting capacity Icu@400V	55 kA
Extreme number	3P
Terminal type	Screw terminals
net weight	0.425 kg

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