The Siemens SIRIUS 3RT1026-3FB48-0KS2-ZW98 is a 3-pole power contactor rated AC-3 25 A, switching 11 kW at 400 V with a 24 V DC coil. It comes in the compact Size S0 footprint with spring-type terminals and is packaged in multi-unit lots of 6.
Lifecycle and Sourcing Reality
For procurement, this means the 3RT1026-3FB48-0KS2-ZW98 is no longer in standard production. It is sourced through independent distribution channels against an RFQ, where availability and current pricing are confirmed at quote time. The official replacement path is the 3RT2 series, which should be evaluated for form, fit, and function compatibility in new designs or BOM revisions.
What the Ratings Mean for Fit
The AC-3 25 A rating at 400 V defines its motor-switching capability: it handles 11 kW induction motor loads in that duty category. The 24 V DC coil means it integrates directly into 24 VDC control circuits common in modern panels, without needing an AC coil supply. The Size S0 frame and spring terminals dictate the panel layout and wiring method — spring terminals accept solid or ferruled stranded conductors and reduce installation time compared to screw terminals.
Panel Integration
The Size S0 contactor mounts on a 35 mm DIN rail per EN 50022, with a width of 45 mm and depth of 91 mm. Side-by-side mounting is permitted with a 6 mm spacing to grounded parts. The spring-type terminals accept 0.5–2.5 mm² solid or stranded wire (2x conductors per clamp), with a strip length of 8–10 mm typical for this terminal family.