The 3RT5045-1BW40: Rated for 114 kW at 690 V at 60 °C ambient, this contactor handles heavy motor loads in conveyor, pump, and fan applications. The S3 frame size and screw-type main terminals accept up to 2x 16 mm² solid/stranded or 2x 1/0 AWG, matching typical panel wiring for 50–100 A motor circuits. The 48 V DC coil draws 15 W closing and holding, so the control transformer or DC supply must be sized for that continuous draw. At 24 V DC the coil draws 6 A inrush; verify your PLC output or relay can handle that peak.
Mounting and integration
Snap-on mounting onto 35 mm or 75 mm standard DIN rail, plus screw fixing for vibration-prone environments. The mounting position allows ±180° rotation on a vertical surface and ±22.5° forward/backward tilt, giving panel layout flexibility in tight enclosures. Width is 70 mm, depth 152 mm, height 146 mm — the S3 footprint. Side-by-side mounting is permitted without derating, so multiple contactors can pack tightly on the rail for multi-motor groups. Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C. The 60 °C rating is the one that governs for panel internal ambient — verify your enclosure's temperature rise stays within that.
Coordination and compliance
With type 2 coordination, the required upstream fuse is gL/gG 160 A. This matters for selectivity studies — the contactor clears faults without damage up to that fuse rating, so it coordinates with standard motor branch circuits. Pollution degree 3 rating means it's suited for industrial environments with conductive pollution (condensation, dust). Insulation voltage rated 1000 V gives headroom for 690 V systems. RoHS compliance date is March 1, 2017 — the part meets EU substance restrictions. Auxiliary switch extension is supported via the SIRIUS add-on system, so you can add feedback contacts without changing the base contactor.
Switching performance
Mechanical life is 10 million operations typical. Electrical life varies by duty: AC-1 (resistive) at 900 cycles/hour, AC-3 (motor start/run) at 1000 cycles/hour, AC-4 (plugging/inching) at 300 cycles/hour. For high-cycle applications like conveyor indexing, the AC-4 limit is the one to watch. At 690 V the contactor switches 21.1 kW motor load; at 400 V 66 kW; at 230 V 38 kW — all at 60 °C ambient. These are the real-world ratings for sizing, not just the maximum voltage number.