What this SIRIUS S0 contactor is and what it does
The Siemens SIRIUS 3RT1026-1XF00-0GA0 is a power contactor in the S0 frame size, designed for switching motor loads and resistive loads in industrial control panels. It mounts on a 35 mm DIN rail per DIN EN 50022, using either screw-fixed or snap-on installation, and occupies a 45 mm width on the rail — a standard slot for this frame class. The operating temperature range of -25 to +60 °C covers most indoor panel environments, and the degree of pollution 3 rating means it tolerates conductive dust or occasional condensation typical of factory-floor enclosures without conformal coating.
Key ratings and what they mean for fit
The AC-2 rating at 400 V is 11 kW, which covers wound-rotor motor starting where the contactor makes and breaks under load — a common spec for crane or hoist applications. The AC-4 rating at 400 V is 15.5 A, for reversing or inching duty where the contactor interrupts stalled-rotor current. The main circuit uses screw-type terminals, accepting solid conductors up to 2x 4 mm² and stranded up to 2x 10 mm², so it lands standard panel wiring without adapters. Built-in varistor surge suppression across the coil means you don't need an external RC snubber for inductive load switching — it's already on the contactor.