The 3RT2018-1AN21: The contactor's coil connection uses screw-type terminals. The main contacts are rated for 20 to 12 operating cycles, with a typical mechanical service life of 30,000,000 operations. Switching frequency varies by duty: up to 1,000 1/h at AC-1, 750 1/h at AC-2, AC-3, and AC-3e, and 250 1/h at AC-4. This means the contactor handles high-cycle resistive loads (AC-1) well, but you must derate significantly for heavy motor jogging or plugging (AC-4).
Wiring and Auxiliary Contact Ratings
Terminals accept solid or stranded conductors from 0.5 to 4 mm², including two conductors per terminal (2x 0.5...1.5 mm², 2x 0.75...2.5 mm², or 2x 4 mm²). This covers most control wiring gauges used in panel building. Auxiliary contact ratings at 24 V rated value is 10 A. At 48 V and 60 V it drops to 2 A, at 110 V to 1 A, at 125 V to 0.9 A, at 220 V to 0.3 A, at 400 V to 3 A, and at 440 V to 0.2 A. The motor rating at 230 V is 2 hp. These are the values to verify against your specific load voltage. Power loss at 50 Hz and 60 Hz is 0.25 each.