The 3RA2220-4BH26-0AP0: Mounting position is vertical only, and the ambient operating range is -20 to +60 °C. If your panel sits in a hot environment near a furnace or in direct sun, derate the continuous current above 40 °C per the Siemens SIRIUS application manual.
What's in the box — supplied components
This reversing starter ships with a 3RT2026-2AP00 contactor and a 3RA2921-2AA00 link module already assembled. The circuit-breaker size is S0, matching the feeder size. No field assembly of the reversing interlock — it's factory-wired and tested. Clearance requirements: 50 mm upwards, 32 mm forwards, 10 mm downwards, 10 mm at the sides, 0 mm backwards. That backwards zero means it can sit flush against the back panel — useful in shallow enclosures.