Siemens 3RT1045-1AL26 SIRIUS Power Contactor — Size S3, 45 kW at 500 V
The Siemens 3RT1045-1AL26 is a SIRIUS power contactor in size S3, rated for 45 kW at 500 V and 21.1 kW at 690 V. It uses screw-type terminals on the main current circuit and accepts stranded conductors up to 2x 50 mm². The contactor mounts via screw or snap-on onto 35 mm and 75 mm standard mounting rail, with side-by-side mounting permitted. Front protection is IP20 with cover or box terminal; the terminal itself is IP00. Pollution degree 3 rated, operating temperature range -25 to +60 °C, storage -55 to +80 °C.
Duty Ratings and Switching Life
The 3RT1045-1AL26 is rated for AC-3 duty at 1 000 operations per hour and AC-4 at 300 operations per hour. AC-1 resistive load maximum is 900 operations per hour. Typical mechanical life is 10 000 000 operations. Arcing time is 10 to 15 ms; operating time at AC is 10 to 25 ms. Coil operating range at 50 Hz is 0.8 to 1.1 times rated voltage, at 60 Hz 0.85 to 1.1.
Auxiliary Contact Ratings
Auxiliary contacts are rated 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V. Coil rated voltage is 230 V at both 50 Hz and 60 Hz. Power dissipation at 1000 V is 37 W.
Termination and Wiring
Main current circuit uses screw-type terminals. Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max. 2x (0.75 to 4 mm²). Stranded conductors: 2x (10 to 50 mm²). Solid or stranded: 2x (2.5 to 16 mm²). Dimensions: depth 139 mm, width 90 mm, height 146 mm.