16 A AC-3 at 400 V — the motor duty rating that governs the real load
The 3RA2120-4AD26-0FB4: The same 16 A holds at 480 V and 600 V (cite:,), so the current rating does not derate across the common North American voltage range. Trip Class 10 (cite:) means the overload relay must trip within 10 seconds at seven times the current setting — the standard for most general-purpose motor starting where the thermal curve needs to protect the winding without nuisance tripping on a normal start.
Busbar snap-on mounting — panel integration for 60 mm systems
The starter is designed for snapping onto 60 mm busbar systems (cite:,) — the vertical mounting position (cite:) is mandatory to keep the contactor and overload relay within their published thermal envelope. Clearance requirements: 50 mm upward, 20 mm forward, 20 mm at the sides, 10 mm downward, and zero backward (cite:,). The supplied contactor is a 3RT2026-1FB40 (cite:) and the link module is a 3RA2921-1BA00 (cite:) — these are the factory-matched pair for this size S0 feeder. Main circuit connections are screw-type terminals (cite:).