Supplied as a wired assembly
The 3RA2220-4EF27-0BB4: This reversing starter ships as a pre-assembled unit: the supplied contactor is a 3RT2027-2BB40, and the link module is a 3RA2921-2AA00 — the factory wiring between the contactors and the overload is already in place, so the panel builder lands the motor leads and the control voltage without piecing together a reversing contactor pair from loose components. The main current circuit terminates on spring-loaded terminals — no screw torque to verify, no thermal cycling loosens the connection over time, which matters in a reversing starter that sees frequent direction changes and the associated vibration.
DIN rail footprint and clearances
Mounts vertically on a 35 mm DIN rail via the supplied adapter for screw or snap-on fixing — the size S0 envelope is 90 mm wide by 269 mm tall by 130 mm deep, and the required clearances around the unit are 50 mm upward, 32 mm forward, and 10 mm downward and to each side for airflow and arc-fault containment. Operating ambient range is -20 to +60 °C — the starter can sit inside a non-conditioned panel on the plant floor provided the internal panel temperature stays below the 60 °C ceiling; storage and transport limits are -50 to +80 °C.