S0 reversing starter, 12 A AC-3, snap-on 60 mm busbar
The 3RA2220-1KD24-0BB4: It snaps onto 60 mm busbar systems (cites:) — no DIN rail adapter needed — and the vertical mounting position (cites:) keeps the arc chambers oriented correctly. The supplied contactor is a 3RT2024-1BB40 (cites:), the link module is 3RA2921-1BA00 (cites:), and the circuit-breaker is size S00 (cites:). Main circuit terminals are screw-type (cites:).
Motor ratings across common line voltages
At 110/120 V it covers 0.75 hp (cites:). These are the NEMA horsepower equivalents for the AC-3 current ratings — useful when the BOM calls out hp instead of amps. The AC-3e rating matches the AC-3 ceiling at 690 V (cites:) — the 'e' suffix indicates the enhanced electrical endurance for IEC 60947-4-1. At 480 V the rated current is 11 A (cites:); at 600 V it's 10 A (cites:). That derating is typical as voltage climbs — the arc energy increases, so the contactor's switching capacity drops slightly.
Panel fit: dimensions and clearances
The starter measures 260 mm high by 90 mm wide by 165 mm deep (cites:,). For side-by-side mounting on the busbar, allow 50 mm upwards (cites:), 32 mm forwards (cites:), 10 mm downwards (cites:), and 10 mm at the side (cites:). Backwards clearance is 0 mm (cites:) — it sits flush against the busbar backplane. Operating temperature range is -20 to +60 °C (cites:); storage and transport range is -50 to +80 °C (cites:,). The temperature compensation is active across the full operating range (cites:).