What this reversing starter delivers in a motor branch circuit
The Siemens SIRIUS 3RA2220-1FD24-0AP6 is a non-fused reversing motor starter in size S0, combining a contactor and a thermal bimetallic overload relay in one assembly for forward/reverse control of a three-phase motor.
Mounting and panel integration — snaps onto 60 mm busbar systems
Fastening method is for snapping onto 60 mm busbar systems, with a vertical mounting position specified — the 155 mm depth, 90 mm width, and 260 mm height fit into the S0 feeder footprint common in Siemens SIRIUS panels. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards — these are the minimum air gaps for heat dissipation and arc flash containment per the manufacturer's installation rules.
Supplied sub-assemblies and overload release design
This reversing starter ships with the contactor 3RT2024-1AP60 and the link module 3RA2921-1AA00 — the overload release is thermal bimetallic, meaning the trip curve follows the motor heating characteristic and requires no external power for the sensing element.