3RA21204DH270BB4
The Siemens SIRIUS 3RA2120-4DH27-0BB4 is an S0-size load feeder assembly that integrates a motor start protection circuit breaker and contactor as a pre-assembled direct start 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 3RA2120-4DH27-0BB4 is part of the SIRIUS 3RA21 series S0 size load feeder assembly, which integrates motor start protection and contactor control into a single pre-assembled unit, suitable for simplified control panel configurations.
Core Product Advantages and Features
Integrated pre-assembled design
The motor starting protection circuit breaker and contactor have been pre-assembled and verified, and only wiring is required on site for use.
Up to 150kA blocking capacity
It has a maximum short-circuit breaking capacity of 150kA and meets both Type 1 and Type 2 requirements.
24-volt DC control circuit
Designed with a 24-volt DC control voltage, it is suitable for use with common DC control systems.
S0 size bus compatible
Belonging to the S0 size series, it can be used with a 60mm busbar system for whole-row power distribution design.
Durable mechanical structure
With a maximum mechanical operation life of 10 million cycles and an IP20 protection rating, it is suitable for long-term operating environments.