What it is and where it fits
The Siemens SIRIUS 3RT2026-2AP04-ZX95 is a size S0 power contactor, part of the SIRIUS family, designed for switching motor loads in industrial control panels. It mounts via screw or snap-on onto a 35 mm standard mounting rail per DIN EN 60715, which means it drops into any standard panel layout without special brackets. The operating temperature range is -25 to +60 °C, and it can be stored from -55 to +80 °C, so it handles unheated warehouses and enclosures without derating concerns at the high end.
Key ratings and what they mean for your load
At 480 V, the AC-3 rating is 21 A — that's the motor-switching current it handles for standard squirrel-cage motors, so a typical 10 hp motor at 480 V is well within range. The magnet coil uses spring-type terminals, not screw clamps — that means faster wiring in the panel and no risk of screw loosening under vibration. There is no built-in auxiliary switch block on this variant, so if you need feedback contacts for a PLC or status lamp, you'll add a separate auxiliary contactor block.