What it is and what it does
The 3RT2544-1NP30: The coil is rated for 175-280 V AC, drawing 3.1 VA at both 50 Hz and 60 Hz, with an inrush peak of 65 A. That 65 A inrush means the control transformer or PLC output driving this coil needs to handle the initial surge, not just the holding VA. Mechanical life is rated at 10,000,000 cycles typical, which suits high-cycle applications like conveyor sortation or packaging lines where the contactor cycles multiple times per minute.
Mounting and panel fit
Mounts via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 60715. The 70 mm width and 140 mm height are standard for the S3 frame; the 152 mm depth is the dimension to watch when sizing the enclosure depth — a 200 mm deep enclosure gives enough clearance for wiring and arc chute access. Mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5° on a vertical surface. This helps when fitting into tight or angled sub-panels. Clearance distances: 10 mm upwards and downwards, 10 mm at the sides, 0 mm forwards and backwards. The zero forward/backward clearance means it can be stacked directly against other devices on the same DIN rail without additional spacing — useful for dense panel layouts.
Termination and wiring
Main power terminals accept solid conductors: 2x (0.5-1.5 mm²) and 2x (0.75-2.5 mm²). For stranded conductors: 2x (6-16 mm²), 2x (10-50 mm²), and 1x (10-70 mm²). The coil terminals are screw-type. The 70 mm² single-stranded termination on the main circuit is generous for an S3 contactor — it can take a 2/0 AWG equivalent, which covers most motor branch circuits up to about 65 A full load.
Sourcing and lifecycle
For a BOM freeze or a new panel design, this contactor is a safe choice — no imminent obsolescence risk. If you need a functional cross-reference, the smaller-frame 3RT2028-1BB40 is a different physical size (S0 vs S3) and will not share the same mounting footprint or terminal capacity without panel rework.