3RA21204BH270BB4
The Siemens SIRIUS 3RA2120-4BH27-0BB4 is an S0-size load feeder assembly that combines a motor starting protection circuit breaker and a contactor to form 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 is easy to install on DIN rail or busbar systems.
Product Positioning
The 3RA2120-4BH27-0BB4 is a SIRIUS 3RA21 series S0 size load feeder assembly that integrates a motor starting protection circuit breaker and a contactor into a single pre-assembled direct starting unit, suitable for simplified power distribution designs.
Core Product Advantages and Features
Integrated pre-assembled structure
The circuit breakers and contactors are assembled before leaving the factory, and only wiring is required on site for them to be put into use.
150kA interruption capacity protection
The short-circuit breaking capacity is up to 150kA, and it meets both Type 1 and Type 2 requirements.
24-volt DC control voltage
The control loop is designed with 24-volt DC, making it suitable for integration with standard DC control systems.
S0 size series compatible
It is a SIRIUS S0 size load feeder and can be installed in a row with a 60 mm busbar system.
High protection and durable design
IP20 protection with up to 10 million operating cycles, suitable for long-term stable operation.