A built-in varistor suppresses the back-EMF when the coil de-energizes, so you don't need an external snubber across the PLC output driving it.
In AC-3 duty (starting and disconnecting squirrel-cage motors), the contactor handles 5.5 kW at both 500 V and 690 V — that's the rating that governs real motor switching. For AC-4 duty (plugging and inching), it's rated 8.5 A at 400 V, which is the figure to check if your application involves frequent reversing or jogging. The AC-12 maximum operating current is 10 A, covering resistive and low-inductance loads.
Short-circuit coordination and wire termination
The screw-type main terminals accept 2 x (0.5 to 1.5 mm²), 2 x (0.75 to 2.5 mm²), or up to 2 x (0.75 to 4 mm²) — solid or stranded — plus AWG equivalents down to 20 AWG. That covers most panel wiring from control to power circuits.
Auxiliary contact and environmental limits
One instantaneous auxiliary contact is built in (NO or NC configuration depends on the variant ordered). Enclosure and terminal protection is IP20 — finger-safe but not washdown-rated, so keep it inside the panel.