3RV2021-4AA20

Siemens 3RV2021-4AA20 SIRIUS Motor Starter Protector: Physical Diagram and Wiring Schematic
Siemens 3RV2021-4AA20 SIRIUS Motor Starter Protector: Physical Diagram and Wiring Schematic

The Siemens SIRIUS 3RV2021-4AA20 is an S0-size three-pole motor starter protector with a current adjustment range of 10~16A. It features a 208A instantaneous short-circuit trip and spring-loaded terminals, making it suitable as an overload and short-circuit protection component for three-phase motor circuits. Kenxin Motor is an authorized distributor, providing genuine products, warranty, and selection consultation services.

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Siemens 3RV2021-4AA20 SIRIUS Motor Starter Protector: Physical Diagram and Wiring Schematic
Product Positioning

The Siemens SIRIUS 3RV2021-4AA20 is an S0-size three-pole motor starter protector with a current adjustment range of 10~16A, providing dual overload and short-circuit protection for three-phase motors.

Core Product Advantages and Features
10~16A Adjustable Overload Protection
It adopts a thermal-magnetic tripping mechanism, and the overload current can be finely adjusted within the range of 10~16A to match the actual load current of the motor.
208A instantaneous short circuit trip
It has a built-in instantaneous electromagnetic tripping element with a set value of 208A, which can quickly cut off the circuit when a short circuit fault occurs, reducing the risk of equipment damage.
High breaking capacity of 55kA at 400V
With a rated short-circuit breaking capacity of up to 55kA at 400V, it provides excellent short-circuit protection and is suitable for industrial distribution box applications.
Spring-loaded terminal blocks
The spring-loaded terminal design ensures fast and secure wiring, eliminating the need for tools and accelerating panel assembly efficiency.
project Specification
brand Siemens
series SIRIUS 3RV2021
Product Category Motor starting protector (motor protection circuit breaker)
Casing size S0
Extreme number 3P
Current adjustment range 10~16A
Instantaneous short circuit trip current 208A
Rated operating voltage Up to 690V AC
Rated short-circuit breaking capacity Icu (400V) 55kA
Break away from level Class 10
Terminal blocks Spring-type terminals
Protection level IP20
Installation method 35mm DIN rail
Operating ambient temperature -20°C ~ +60°C
Applicable power supply (400V AC-3) Approximately 7.5kW

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