The 3RT7026-1AG00: Rated insulation voltage is 690 V, and surge voltage resistance is 6 kV — that covers the typical 400/480 V distribution with headroom for transient events. For fuse coordination, Type 2 requires a 35 A gL/gG NH 3NA fuse; Type 1 allows up to 80 A — useful when you need to coordinate with upstream protection without oversizing the contactor. That means you can wire the aux directly to a 24 VDC digital input without worrying about oxide films blocking the low-energy signal. Mechanical endurance is backed by the switching rates: 800 operations per hour maximum under AC-3 duty, 250 per hour under AC-4. That's typical for a general-purpose contactor in conveyor or pump cycling; if your application demands frequent jogging or reversing, the AC-4 limit is the one to watch.
Screw-type terminals on both main and control circuits accept 2x (0.5…1.5 mm²) solid/stranded or 2x (0.75…2.5 mm²) finely stranded with ferrules.