3RA21204EA270BB4
The Siemens SIRIUS 3RA2120-4EA27-0BB4 is an S0-size load feeder assembly that combines a motor starting protection circuit breaker and a contactor into a pre-assembled direct starting unit. It has a short-circuit breaking capacity of up to 150kA, a control voltage of 24V DC, 1NO+1NC auxiliary contacts, IP20 protection, and can be installed on a DIN rail or bus system.
Product Positioning
The 3RA2120-4EA27-0BB4 is a SIRIUS 3RA21 series S0 size load feeder assembly that integrates circuit breakers and contactors into a pre-assembled direct start unit, helping to reduce wiring and fault points in the field.
Core Product Advantages and Features
Pre-assembled direct start unit
Circuit breakers and contactors are assembled and tested before leaving the factory to reduce the risk of wiring errors on site.
150kA high interrupting capacity
The short-circuit breaking capacity is up to 150kA, and it meets the protection requirements of both Type 1 and Type 2 protection.
24-volt DC control system
The control voltage is 24 volts DC, making it compatible with standard DC control power supplies.
S0 size series specifications
It is a SIRIUS S0 size load feeder, suitable for integrated applications of small and medium-sized motor circuits.
Long mechanical life design
With a maximum of 10 million operation cycles and IP20 protection, it is suitable for production line equipment with frequent start-stop operations.