3RV2321-4AC20

The 3RV2321-4AC20 is a Siemens SIRIUS S0 frame motor protection circuit breaker with a rated current of 16A and an instantaneous short-circuit trip value of 208A. It adopts a spring-type terminal design, which can complete the wiring without screws. It can be assembled with SIRIUS contactors to form a small motor starter combination solution.

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Siemens SIRIUS 3RV2321-4AC20 Motor Protection Circuit Breaker 16A Spring Terminal Appearance Drawing

Product Positioning

The Siemens SIRIUS 3RV2321-4AC20 is a motor protection circuit breaker with an S0 frame and starter combination. It has a rated current of 16A, an instantaneous short-circuit trip value of 208A, and uses spring-loaded terminal wiring.

Core Product Advantages and Features

Spring-loaded terminal design

Tool-free locking; simply insert the wire to complete the wiring, suitable for quick panel matching.

16A rated with 208A instantaneous trip

This corresponds to the protection requirements of motors with a power output of approximately 4 to 11 kW (230 to 690 V).

S0 standard frame dimensions

It can be combined with SIRIUS contactors to form an integrated miniature starter assembly.

Triple short circuit protection

In the event of a short circuit fault, all three poles trip synchronously to ensure circuit safety.

project	Specification
brand	Siemens
series	SIRIUS 3RV2
Frame size	S0
Rated current	16 A
Instantaneous short circuit trip value N-release	208 A
Extreme number	3P
Rated operating voltage	690 V AC
Rated short-circuit breaking capacity Icu (400V AC)	55 kA
Rated short-circuit breaking capacity Icu (690V AC)	4 kA
Terminal type	Spring-loaded terminals
Overload protection method	Fixed rated current, stepless adjustment, requires an overload relay.
Protection level	IP20
Installation method	35 mm DIN rail (EN 60715)
Operating ambient temperature	-20°C ~ 60°C
Product Uses	Circuit breaker for starter combination.

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