Siemens 3RT2045-1AL26 — SIRIUS Power Contactor, S3 Frame
The contactor measures 80 mm wide by 140 mm high by 152 mm deep, fitting standard panel layouts with clearance requirements of 10 mm upwards, 20 mm forwards, 10 mm downwards, and 10 mm at the side. It accepts solid conductors from 2.5 to 16 mm² and stranded conductors from 6 to 70 mm², with fine-stranded capacity for 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The main contacts are configured as 10 normally open and 2 normally closed, and the contactor is rated for mechanical service life of 10,000,000 operations typical.
Duty Class and Switching Frequency
Switching frequency varies by duty class: AC-1 (resistive) maximum 900 cycles/h, AC-2 (slip-ring motor) maximum 400 cycles/h, AC-3 (squirrel-cage motor starting) maximum 1,000 cycles/h, AC-3e (enhanced AC-3) also 1,000 cycles/h, and AC-4 (plugging/inching) maximum 300 cycles/h. Operating time is 10 to 21 ms at AC, with arcing time of 10 to 20 ms. Power factor is 0.35 at 50 Hz and 0.41 at 60 Hz.
Auxiliary Contact Ratings and Environmental Range
The auxiliary switch is rated for 6 A at 24 V, 2 A at 48 V, 2 A at 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 0.8 A at 440 V.