What it is and what it fits
The Siemens 3RT2026-1AL20-ZX95 is a SIRIUS power contactor in the S0 frame size, 45 mm wide, with screw-type coil terminals and a built-in auxiliary switch. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward. That flexibility means it fits into tight panel layouts without forcing a specific orientation.
Key ratings and what they mean for your panel
Wire range accepts solid or stranded conductors from 1 to 10 mm², and for double ferruled connections it handles 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). That covers most control and power wiring you'll see in a standard industrial panel — no need for special lugs or adapters. The contactor is rated for mechanical endurance of 10 million operations typical, so it's built for high-cycle applications like conveyor or pump control where the contactor cycles every few seconds.
Switching frequency and thermal limits
Maximum switching rates are 1,000 cycles per hour for AC-1 resistive loads, 750 cycles per hour for AC-3 motor starting, and 250 cycles per hour for AC-4 inching/plugging duty. The arcing time is 10 ms, and the coil operates on AC with pick-up times of 4 to 16 ms. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. For a line-down replacement, these numbers tell you the contactor can keep up with a fast cycling process without overheating the coil or welding the contacts.