Siemens 3RT1044-3AP06 SIRIUS Power Contactor — S3 Frame, Screw Terminals
It mounts via screw or snap-on onto 35 mm or 75 mm standard DIN rails, fitting into a 90 mm wide by 146 mm tall by 139 mm deep envelope — a footprint that leaves room for adjacent devices in a crowded enclosure. In AC-4 duty — reversing or inching applications — it carries 55 A at 400 V, which is the rating that governs contact life under frequent jogging or plugging. The screw-type terminals on the main circuit accept solid conductors from 0.25 to 2.5 mm² (two per clamp) and stranded conductors from 10 to 50 mm² (two per clamp), covering the full range of panel wiring from control circuits to motor feeders. The control coil is rated for 50 Hz operation, with a 24 V rated current of 10 A and a 230 V rated current of 6 A — these are the coil inrush and hold values, not the main contact ratings.
Mounting and Integration — DIN Rail Fit
The 90 mm width and 146 mm height place this contactor in a standard panel layout slot. Side-by-side mounting is permitted, so multiple contactors can be ganged without spacing gaps — useful for grouping motor starters on a common DIN rail. The IP20 rating on the front with the cover or box terminal installed means the live parts are finger-safe during panel access; the terminal area itself is IP00, so the panel builder must maintain clearance to grounded metalwork.