AC-3 covers starting and disconnecting squirrel-cage motors under full load, so this part is sized for heavy motor drives, compressors, or pump banks where the inrush is substantial. The same contactor also carries an AC-1 rating for resistive circuits like heating banks or lighting, where the switching current is purely resistive and less stressful on the contacts. The coil is 220 V AC at 50 Hz, a standard control voltage across European and Asian industrial panels. The control circuit is AC type, so it expects a sine-wave supply — not DC or rectified AC without checking the pickup/dropout curve. Auxiliary contacts are built in: 3 normally open, 2 normally closed instantaneous, plus one changeover on-delay contact. That's a lot of onboard auxiliaries for a contactor this size — enough to seal in the coil, signal back to a PLC, and interlock a second device without bolting on an extra contact block. The on-delay contact is useful for staggered motor starts or sequenced valve actuation.
The TeSys B frame size for the BJ current code is a bolted-down contactor — not a snap-on DIN rail mount at this rating. Expect busbar or cable connections on the power terminals, and plan for the physical footprint of a 470 A frame when laying out the enclosure. The auxiliary contacts are front-accessible, so wiring them after the power connections is straightforward.