SIRIUS Size S0 power contactor — 48 VDC coil, screw terminals
The Siemens 3RT2023-1BW40 is a SIRIUS-branded power contactor in Size S0, designed for switching motor and resistive loads in industrial control panels. It carries a 48 VDC coil with screw-type terminals and mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. Rated operational currents: 10 A at 24 V DC, 2 A at 48 V DC, 2 A at 60 V DC, 1 A at 110 V DC, 0.9 A at 125 V DC, 0.3 A at 220 V DC, and 3 A at 400 V AC. The AC-3 switching frequency is rated up to 1 000 operations per hour; AC-4 is limited to 300 per hour. Mechanical endurance is rated at 10 000 000 operations typical. The contactor includes an auxiliary switch and accepts main contact wire sizes from 16 to 8 AWG (solid or stranded 1 … 10 mm²).
Panel integration and mounting
Width is 45 mm, height 85 mm, depth 107 mm. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5°. Required clearances: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the side. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Coil pick-up is at 0.8 of rated voltage, drop-out at 1.1 of rated voltage (full-scale value). Wire sizes: solid or stranded 1 … 10 mm² for main contacts; auxiliary contacts accept 2x (0.5 … 1.5 mm²) or 2x (0.75 … 2.5 mm²). Arcing time is 10 ms; DC switching time is 15 … 18 ms.