25 A AC-3 direct on-line starter, S0 frame
The 3RA2120-4DA27-0BB4: This is a factory-assembled combination starter: it ships with the 3RT2027-1BB40 contactor and the 3RA2921-1BA00 link module already integrated, so the overload relay and contactor are mechanically and electrically coordinated. No separate wiring between the contactor coil and overload trip contacts — the link module handles that internally.
DIN rail footprint and panel clearances
The S0 footprint is 45 mm wide, 193 mm tall, and 107 mm deep — that's the depth from the DIN rail backplane to the front of the enclosure. Clearance requirements: 50 mm above, 20 mm below, 20 mm to the sides, and 20 mm forward for arc-chute venting and wiring access. Zero clearance needed behind the rail. The main circuit terminals are screw-type, sized for standard power wiring up to the 25 A rating. Ambient operating range is -20 to +60 °C with temperature compensation active across that band; storage and transport limits are -50 to +80 °C.
Sourced through authorized distribution channels. No stock-holding claim on this listing; each order is quoted individually.