3RA21204EH270BB4
The Siemens SIRIUS 3RA2120-4EH27-0BB4 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 short-circuit breaking capacity of up to 150kA, a control voltage of 24V DC, 1NO+1NC auxiliary contacts, IP20 protection, and is suitable for DIN rail or busbar system installation.
Product Positioning
The 3RA2120-4EH27-0BB4 belongs to the SIRIUS 3RA21 series S0 size load feeder assembly, which pre-assembles the motor starting protection circuit breaker and contactor into a direct starting unit, suitable for small and medium-sized motor circuits that require simplified wiring.
Core Product Advantages and Features
Circuit breaker contactor pre-assembly
The motor starting protection circuit breaker and SIRIUS contactor are assembled before leaving the factory, greatly simplifying on-site installation and wiring.
High short circuit interrupting capacity
The short-circuit breaking capacity is up to 150kA and meets both Harmony Type 1 and Type 2 requirements.
24-volt DC control voltage
The control circuit adopts a 24-volt DC design, which facilitates integration with common PLCs or control power supplies.
S0 size compact structure
Belonging to the SIRIUS S0 size series, it is suitable for use with 60mm busbar systems for whole-row power distribution design.
IP20 protection and long mechanical life
With an IP20 protection rating and a maximum mechanical operation life of 10 million cycles, it is suitable for long-term operation.