3RA21204CA270BB4
The Siemens SIRIUS 3RA2120-4CA27-0BB4 is an S0-size load feeder assembly that pre-assembles a motor starting protection circuit breaker and contactor into a direct starting unit. It has a maximum short-circuit breaking capacity of 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 3RA2120-4CA27-0BB4 is a SIRIUS 3RA21 series S0 size load feeder assembly that integrates motor start protection and contactor control in a pre-assembled manner, simplifying the control panel installation process.
Core Product Advantages and Features
Pre-assembly saves installation time
Circuit breakers and contactors are assembled and tested before leaving the factory, which greatly shortens the on-site installation time.
150kA high interruption protection
The short-circuit breaking capacity is up to 150kA, and it complies with both Harmonized Type 1 and Type 2 specifications.
24-volt DC control voltage
The control circuit adopts a 24-volt DC design, which is highly compatible with common DC control power supplies.
S0 series unified specifications
It belongs to the SIRIUS S0 size load feeder series, which facilitates the planning of shared accessories with products of the same size.
Durable and reliable design
With a maximum mechanical operation life of 10 million cycles and IP20 protection, it is suitable for long-term stable operation.