What It Is and Where It Fits
The Siemens SIRIUS 3RT2026-1AC20-ZX95 is a size S0 power contactor designed for switching motor loads and resistive loads in industrial control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, with a 45 mm width that fits standard panel layouts. The contactor accepts solid or stranded conductors from 1 to 10 mm² for main circuit wiring, and includes an auxiliary switch for feedback or interlock circuits. Mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5°.
Key Ratings and What They Mean for Fit
The S0 frame size defines the contactor's thermal and mechanical endurance. Mechanical life is rated at 10,000,000 operating cycles typical, meaning it holds up in high-cycle applications like conveyor or pump control. Switching frequency limits vary by duty: AC-1 (resistive) allows up to 1,000 cycles/hour; AC-3 (motor starting) and AC-3e (enhanced motor) allow 750 cycles/hour; AC-4 (plugging/inching) is limited to 250 cycles/hour. This governs how aggressively you can cycle the load without overheating the contactor. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C — suitable for unheated enclosures in temperate climates. Auxiliary contact ratings are provided at multiple DC voltages: 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, and 0.6 A at 440 V. Use the voltage-specific value for sizing control circuits.