20 A AC-3 at 400 V — the rating that sets the motor size
The 3RA2120-4BE27-0AP0: The Trip Class 10 overload relay inside clears a stalled rotor before the motor winding temperature exceeds its insulation class — critical for pumps and conveyors that can jam under load.
DIN rail footprint and enclosure clearance
Width is 45 mm, depth 107 mm, height 243 mm — the 45 mm width occupies exactly three 15 mm DIN-rail module spaces, so panel builders can plan the rail layout without guesswork.
Wiring and supplied components
Main current circuit uses spring-loaded terminals — no screwdriver torque check needed, just strip the wire and push in. This speeds up panel wiring and eliminates loose-terminal callbacks. The starter ships with a 3RT2027-2AP00 contactor and a 3RA2921-2AA00 link module already assembled. If the contactor fails in service, order the 3RT2027-2AP00 as the direct replacement — no need to swap the whole starter.
Active production — no obsolescence risk
Lifecycle stage is current — Siemens still builds this order code. No last-time-buy window to navigate, no successor substitution needed.