12 A AC-3 at 400 V — S0 direct starter for 60 mm busbars
The 3RA2120-1KH24-0BB4: It snaps onto 60 mm busbar systems (the fastening method is designed for that), which means it integrates directly into a panel busbar layout without a separate DIN-rail adapter — a time-saver in high-density builds.
What the AC-3 rating and trip class mean for your motor circuit
The supplied contactor is a 3RT2024-2BB40 and the link module is a 3RA2921-2AA00 — these are the matched components that make this a factory-assembled starter, not a field-built combination.
Mounting and clearances — vertical snap-on, S0 footprint
Mounting position is vertical only, and the unit snaps onto 60 mm busbar systems — the S0 size means 45 mm width, 165 mm depth, 260 mm height, so plan the busbar spacing and enclosure depth accordingly. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards, 0 mm backwards — the zero backwards clearance means it can sit flush against the back panel, which helps in shallow enclosures.
Active production — sourcing posture
Operating temperature range is -20 to +60 °C, storage and transport range is -50 to +80 °C — the wider storage envelope means it can sit in a warehouse or on a truck in extreme conditions without damage, as long as it is not powered.