Siemens 3RA21101AA151BB4 Combination Starter

Siemens 3RA21101AA151BB4 Combination Starter is a fuseless load feeder direct-on-line starter for three‑phase motors up to 400 V AC, sized S00, with a 24 V DC control coil. This three‑pole unit, part of the SIRIUS 3RA21 family, is designed for DIN‑rail mounting in IP20 enclosures, enabling installation in standard control cabinets with minimal wiring. The coil voltage is 24 V DC and the rated load current ranges from 1.1 to 1.6 A, suitable for direct starting of small motors at 400 V. As a complete combination starter, it integrates motor protection and switching in a single compact package, which can simplify wiring in control panels and streamline commissioning. The fuseless load feeder design provides a straightforward solution for direct‑start sequences at line voltage, while preserving a compact footprint that fits typical S00‑size installations and remains compatible with Siemens’ Sirius components ecosystem.