17 A, 3-pole, 480 V coil — what this ABB contactor is
The ABB A16-30-10-51 is a 3-pole contactor rated at 17 A, with a 480 V AC control coil that also accepts 400-415 V at 50 Hz. That 17 A figure is the conventional thermal current (Ith) — the continuous current the main poles can carry in open air. For motor switching, derate to the AC-3 rating, which is typically about 0.6x Ith for this frame size. The coil voltage is 480/60, 400-415/50 — meaning it pulls in reliably on 480 V 60 Hz or 400-415 V 50 Hz supplies. If your control transformer taps are at 480 V, this is a direct fit; if you're on a 400 V 50 Hz plant network, it still works within the same coil tolerance band.
How the A16-30-10-51 compares to the AF series peer
The AF series adds an electronic coil interface that accepts a wide control voltage range (100-250 V AC/DC) without swapping coils — a convenience the A16-30-10-51's fixed 480 V coil cannot match. The AF-series peer also carries a higher switching current (25 A vs 17 A) and includes an auxiliary contact (1NO) built in, whereas the A16-30-10-51 may need a separate side-mount block. Panel footprint and DIN-rail mounting are similar, but the coil wiring differs — the AF's universal coil eliminates the need to match line voltage exactly.