S0 direct starter for 60 mm busbar panels
The 3RA2120-4BH27-0AV0 is a SIRIUS direct-on-line starter in size S0, designed for snapping onto 60 mm busbar systems — a common layout in IEC motor control centres where the busbar doubles as the mounting rail and power distribution backbone. The unit ships as a pre-assembled combination: the supplied 3RT2027-2AV00 contactor and 3RA2921-2AA00 link module, wired internally for direct-on-line starting, so the panel builder lands the motor leads and control wires at the spring-loaded terminals without sourcing separate components.
Mounting envelope and thermal limits
Dimensions are 45 mm wide, 260 mm high, and 165 mm deep — the width is the critical panel pitch dimension; at 45 mm it occupies one standard 45 mm module slot on the busbar, leaving adjacent slots free for other S0 feeders or auxiliaries. Clearance requirements: 50 mm above, 20 mm in front, 10 mm below, and 20 mm to each side — these free-air spacings must be maintained inside the enclosure to keep the thermal trip within its calibrated curve at full load. Rated for vertical mounting only; operating ambient range is -20 to +60 °C, with storage and transport limits from -50 to +80 °C.