The Siemens 3RT1024-3XG28-0MV0-ZW97 is a SIRIUS S0-frame power contactor with a 110 V 50/60 Hz coil, screw-type terminals for the main circuit, and an integrated RC surge suppressor. It's rated for motor switching at 7.5 kW at both 500 V and 690 V, and delivers 12.5 A in AC-4 duty at 400 V — the heavy jogging and inching category.
For AC-4 at 400 V, the rated operational current is 12.5 A, which covers plugging and inching of squirrel-cage motors. The AC-12 rating (control-circuit resistive load) is 10 A. The two built-in auxiliary contacts (instantaneous) handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V, so they can drive small contactors or PLC inputs directly without an interposing relay. The coil holds in at 0.8 to 1.1 times rated voltage at 50 Hz, and 0.85 to 1.1 at 60 Hz. That's a standard operating range — expect dropout below about 88 V at 50 Hz. The RC suppressor is built in, so you don't need an external snubber for the coil; just watch polarity if you're feeding DC to the coil (this is an AC coil). That's typical for industrial control panels — no derating needed for most factory-floor environments.
Side-by-side mounting is permitted — no gap required between contactors. The screw terminals for the main circuit accept 2x (0.25 to 2.5 mm²) solid, 2x (1 to 2.5 mm²) stranded, 2x (2.5 to 6 mm²) stranded, or up to 2x 10 mm². For AWG: 2x (16 to 12), 2x (14 to 10), or 1x 8. The front has IP20 finger protection; the terminal area itself is IP00 — keep tools and fingers clear when live. That's the standard short-circuit protection for this frame size — it lets the contactor survive a fault without welding the main contacts.