Siemens SIRIUS 3RT2028-2AP60 Power Contactor – S0 Frame, 45 mm
The contactor carries an integrated auxiliary switch (1 N/O + 1 N/C configuration per the 18...8 coding), with spring-type terminals on the magnet coil for reliable connection. Rated mechanical life is typical 10,000,000 operations.
Duty Ratings and Switching Frequency
Switching frequency varies by duty category: 1,000 cycles/hour maximum in AC-1 (resistive), 750 cycles/hour in AC-2 and AC-3 (motor starting/running), 750 cycles/hour in AC-3e, and 250 cycles/hour in AC-4 (plugging/inching). The AC-3e rating at 750 cycles/hour covers the enhanced motor-switching profile. Auxiliary contact ratings are specified at multiple voltage levels: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V. A 230 V rating is listed as 5 hp, indicating motor-switching capability at that voltage.
Wiring and Clearance
Main circuit terminals accept solid or stranded conductors from 1 to 10 mm², with dual-wire capability for 2x (0.5 to 2.5 mm²). Operating time at AC is 4 to 16 ms, with arcing time specified at 10 ms. Coil operating power is 0.25 VA at 50 Hz and 0.28 VA at 60 Hz.