What ships in the carton
The 3RA2125-4AD26-0BB4 is a complete SIRIUS non-fused motor starter assembly — a direct starter combining a contactor, thermal overload relay, and link module on a common busbar adapter, all pre-assembled and tested as a single order code. The kit includes the supplied 3RT2026-1BB40 contactor, the 3RA2921-1BA00 link module, and the 8US1251-5NT10 busbar adapter — no separate sourcing for these subcomponents.
Motor ratings that decide the fit
Rated 15.2 A at 480 V AC-3 and 12.2 A at 600 V AC-3 — these are the continuous motor current limits for the S0 frame in standard duty. The 24 V control coil is common for PLC-driven panels where the control transformer steps down to 24 VDC or 24 VAC.
Panel fit and clearance envelope
Dimensions: 45 mm wide, 260 mm tall, 165 mm deep — the S0 frame fits a standard 8-inch deep enclosure. Mounting is vertical by snapping onto 60 mm busbar systems, which is the standard Siemens busbar pitch for this feeder size. Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards — the rear face sits flush against the mounting surface, so no rear breathing space is needed. Main contact wire range accepts 1 to 10 mm² stranded, or 2 × (2.5 to 6 mm²) for paralleled feeds. Pollution degree 3 means it's rated for industrial environments with conductive dust or occasional condensation — no derating needed for typical panel conditions.