SIRIUS S3 power contactor with spring-type coil terminals
The 3RT2045-3CP04-3MA0: The 77 A rating at 480 V in AC-3 duty tells you it handles standard squirrel-cage motors up to that current during starting and running — the AC-3 category covers starting and switching off running motors, so this is the number that matters for motor branch circuits. The coil connection uses spring-type terminals, which means you land the control wires without a screwdriver — push in a ferruled or solid conductor and the spring clamps it. That speeds up panel wiring and avoids the cold-flow loosening you can get with screw terminals on a vibrating contactor.
Panel fit and mounting flexibility
That means you're not locked into one orientation — useful if the panel layout forces a non-standard angle or if you're mounting on a swing frame. The forward clearance of 20 mm is the space needed in front of the contactor for arc venting — don't crowd it against the enclosure door or another device.
Current production lifecycle and sourcing
Sourced to order against your BOM quantity through independent distribution channels.
Wire sizing and termination
Main contact terminals accept solid wire from 2.5 to 16 mm² and stranded wire from 6 to 70 mm². The stranded range goes up to 70 mm², which is roughly 2/0 AWG — that's the wire size you'd expect for a 77 A motor circuit at 75°C termination rating.