What the 28 A AC-3 rating means for your motor load
The 3RA2120-4NA27-0AP0: At 480 V it delivers 27 A, and at 600 V it holds 27 A as well, so the current ceiling is consistent across common North American line voltages.
DIN-rail fit and panel clearance
Width is 45 mm — that's a single 9 mm DIN-rail module slot, so it fits tightly in a crowded panel. Depth is 97 mm, height 193 mm. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards, and 0 mm backwards — so the back of the starter can sit flush against the panel backplate.
What's in the box — supplied contactor and link module
The starter ships with a 3RT2027-1AP00 contactor and a 3RA2921-1AA00 link module already integrated. That means it's a factory-assembled combination — no separate ordering of the contactor and overload relay, and the wiring between them is done via the link module. Main circuit terminals are screw-type, so you'll need a screwdriver for the power connections. The load feeder size is S0, and the circuit-breaker size is also S0 — consistent with the frame.
Temperature range and storage
Operating ambient is -20 to +60 °C, storage and transport -50 to +80 °C. Temperature compensation is active across the operating range, so the overload curve stays accurate without manual adjustment.