What the 3.6 A AC-3 rating means for your motor load
The 3RA2220-1FB24-0AK6: This current rating governs the full-voltage starting of squirrel-cage motors — the contactor set inside (3RT2024-1AK60) is sized for this switching class, not for resistive or lightly inductive loads. For a 3 hp motor at 480 V (the nameplate rating this unit supports), that translates to a locked-rotor protection curve that clears before the motor insulation reaches its thermal limit.
Panel fit and mounting constraints
This reversing starter occupies a size S0 footprint: 90 mm wide, 120 mm deep, 265 mm tall. It mounts vertically on a 35 mm DIN rail via an adapter that also accepts screw fixing — no special bracket needed for standard enclosures. Clearance requirements are tight: 50 mm upwards, 32 mm forwards, 10 mm downwards, and 10 mm at the side. Backwards clearance is zero — the unit sits flush against the mounting surface.
Lifecycle and sourcing posture
The supplied link module (3RA2921-1AA00) and RH assembly kit (3RA2923-1BB1) are integral to the reversing function — they are not sold separately as a field retrofit. If you need a replacement for an existing installation, the complete starter is the ordering unit.
Compliance and documentation
REACH compliance is standard for Siemens SIRIUS components. The operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C.