3RA21204DA270BB4
The Siemens SIRIUS 3RA2120-4DA27-0BB4 is an S0-size load feeder assembly that pre-assembles a motor starting protection circuit breaker and a contactor into a direct starting unit. It has a short-circuit breaking capacity of up to 150kA, uses 24-volt DC control voltage, has 1NO+1NC auxiliary contacts, IP20 protection, and is suitable for DIN rail or busbar system installation.
Product Positioning
The 3RA2120-4DA27-0BB4 is a SIRIUS 3RA21 series S0 size load feeder assembly that integrates circuit breaker protection functions with contactor control into a single pre-assembled direct start unit.
Core Product Advantages and Features
Circuit breaker and contactor combined
The motor starting protection circuit breaker and contactor are pre-assembled at the factory, reducing on-site installation steps.
150kA short-circuit breaking capacity
The short-circuit breaking capacity is up to 150kA and meets both Harmonized Type 1 and Type 2 requirements.
DC 24V control design
The control voltage is 24 volts DC, which facilitates integration into standard DC control systems.
S0 size series consistent design
It belongs to the SIRIUS S0 size load feeder family, which facilitates unified planning with other products in the same series.
High protection and long lifespan
With an IP20 protection rating and a maximum of 10 million operating cycles, it is suitable for long-term use in industrial settings.