3RV2021-4EA20

The Siemens SIRIUS 3RV2021-4EA20 motor protection circuit breaker has a housing size of S0, a current adjustment range of 27~32A, a rated operating current of 32A, and spring-loaded terminals. It is suitable for overload and short-circuit protection applications in direct-start motor circuits.

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Product Positioning

The 3RV2021-4EA20 is a Siemens SIRIUS series S0 enclosure motor protection circuit breaker with a current adjustment range of 27~32A. It combines thermal overload and electromagnetic short circuit instantaneous tripping to provide complete overload and short circuit protection for the motor circuit.

Core Product Advantages and Features

Thermal overload protection

It adopts a temperature-compensated thermal element, which can accurately adjust the trip value within the range of 27~32A according to the actual rated current of the motor, so as to avoid long-term overload and heat damage to the motor.

Momentary short circuit tripping

It has a built-in electromagnetic instantaneous short-circuit tripping mechanism that immediately cuts off the main circuit current the moment a short-circuit fault occurs, protecting the conductors and downstream equipment.

Spring-loaded terminal blocks

The main circuit uses spring-loaded terminals, which can securely clamp the wires without screws, shortening wiring and maintenance time.

Standard rail quick installation

It can be directly snapped onto a 35mm standard DIN rail and also supports screw fixing, facilitating quick layout and replacement within the distribution box.

project	Specification
Product Type	SIRIUS 3RV2 Series Motor Protection Circuit Breaker (Motor Starting Protector)
Casing size	S0
Extreme number	3P
Break away from level	CLASS 10
Rated insulation voltage	690V AC (Pollution Level 3)
Short-circuit breaking capacity Icu	240V:100kA / 400V:55kA / 500V:10kA / 690V:4kA
Protection level	IP20
Installation method	35mm standard guide rail (DIN EN 60715), screw fixing + snap-on installation.
Applicable Standards	IEC/EN 60947-4-1
Current adjustment range	27...32 A
Rated operating current (AC-3)	32 A
Instantaneous short-circuit tripping current (N-release)	400 A
Terminal type	Spring-loaded terminal blocks
External dimensions (height x width x depth)	119 x 45 x 97 mm
weight	Approximately 0.43 kg

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