What It Is and Where It Fits
The Siemens 3RT1026-1AV60-0UA0 is a SIRIUS power contactor in the S0 frame size, designed for switching three-phase motor loads and resistive loads in industrial control panels. Its 480 V 60 Hz coil matches North American control voltage standards. Three normally-open main contacts handle the power circuit, with screw-type terminals accepting solid and stranded wire from 0.5 to 4 mm² (or 2x 10 mm² max) and AWG 16 to 8. The front face carries IP20 finger protection; the terminal area is IP00, so it expects enclosure protection downstream. Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, occupying 45 mm width on the rail. Side-by-side mounting is allowed with zero gap, saving panel space — a 6 mm clearance to grounded parts is required on the sides.
Key Ratings and What They Mean for Your Load
For AC-3 duty (squirrel-cage motor starting), this contactor is rated for 11 kW at both 500 V and 690 V. That means it can switch a 15 HP motor at 480 V or an 18.5 kW motor at 690 V without welding the contacts on inrush. The AC-4 rating of 15.5 A at 400 V covers reversing or plugging duty where the contacts break full-load current. AC-2 duty (slip-ring motor starting) is rated 11 kW at 400 V. For purely resistive loads (AC-12), the maximum operating current is 10 A. The auxiliary contact block handles 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — these ratings are for the built-in or add-on auxiliary contacts, not the main poles. Type 1 coordination allows a 100 A gL/gG fuse upstream; Type 2 coordination (no contactor damage after a fault) requires a 35 A gL/gG fuse. The mechanical life is 10 million operations typical — this is a workhorse for frequent cycling applications like conveyors or compressors.
Environmental and Installation Limits
Operates from -25 °C to +60 °C ambient, with pollution degree 3. Maximum altitude 2 000 m without derating. The 60 Hz coil tolerance is 0.8 to 1.1 times rated voltage. Dimensions: 85 mm height, 45 mm width, 91 mm depth. The depth is the critical dimension for shallow enclosures — verify your gland plate clearance if back-mounting. The screw terminals accept up to 2x 4 mm² or 1x 10 mm² per pole; use ferrules on stranded wire for reliable termination.
Sourcing and Lifecycle Reality
No official successor exists because it is the active design. If you are holding a legacy panel with an older S0 contactor, this 3RT1026-1AV60-0UA0 is the direct drop-in replacement for the same frame size and coil voltage. Verify the auxiliary contact configuration if your existing unit has a different stack.