The Siemens 3RT1026-1BB40-0BA0-ZX95 is a SIRIUS S0 power contactor with a 24 VDC coil. It's rated for 10 A at 24 V and uses screw-type terminals for the main circuit. The 45 mm width and 101 mm depth let it fit standard 35 mm DIN rail (DIN EN 50022) with screw or snap-on mounting. At 85 mm tall, it leaves room for auxiliary blocks on top.
What the ratings mean for fit
The 24 VDC coil draws 5.4 W on close and hold — that's the same number, so no extra inrush heat to plan for. The S0 frame size tells you this is a compact contactor for moderate motor loads; it's not the smallest (S00) or the largest (S3) in the SIRIUS family. The IP20 front and IP00 terminal block mean it's meant for a closed panel, not a washdown floor. Pollution degree 3 confirms it handles conductive dust and occasional condensation — typical for industrial control cabinets.
Where it's used
This contactor switches motor loads in control panels — pumps, conveyors, fans, compressors. The AC-2 rating at 400 V gives 11 kW for slip-ring motors; AC-4 at 400 V gives 15.5 A for reversing or inching duty. The side-by-side mounting clearance is 6 mm, so you can pack several on a DIN rail without derating, as long as you respect the fuse coordination: Type 2 requires a 35 A gL/gG fuse, Type 1 allows up to 100 A.