SIRIUS Size S2 power contactor — 24 VAC coil, 22 kW at 500 V AC-3
The Siemens 3RT1035-1AC20 is a SIRIUS Size S2 power contactor with a 24 VAC 50/60 Hz coil, rated for motor switching at 22 kW at 500 V AC-3 and 18.5 kW at 400 V AC-2.
The AC-3 rating at 690 V is 11.4 kW. Per the datasheet, the maximum operating rate at AC-3 is 1,000 operations per hour, and at AC-4 (plugging/inching) it drops to 300 ops/h. Mechanical life is listed at 10 million operations typical.
Coil and control circuit specs
Voltage tolerance at 50 Hz is 0.8 to 1.1 times rated; at 60 Hz it's 0.85 to 1.1. Operate time at AC is 7 to 20 ms, arcing time 10 to 15 ms. The auxiliary contact ratings are given per the spec table: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 0.3 A at 220 V DC.
Main circuit terminals accept solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire: 2x (0.75 to 25 mm²). For combined solid or stranded, the spec lists 2x (0.75 to 16 mm²). That 25 mm² stranded capacity on the main circuit is generous for a Size S2 frame — it accommodates the heavier tails needed for the 22 kW rating without pigtailing.