What it is and where it lands
The Siemens 3RT7026-1AQ05 is a Size S0 3-pole contactor with three normally-open main contacts. It screws or snaps onto a 35 mm DIN rail per EN 50022, making it a direct panel-mount fit for motor starting and general switching in industrial control cabinets. The IP20 finger-safe enclosure on the front and terminals means it's intended for enclosed panel use, not washdown zones.
Current ratings and what they drive
Rated 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V in AC-3 duty — those are the motor-switching currents for a standard 3-phase induction motor load. The AC-3 curve is the one that governs real-world contactor sizing for squirrel-cage motors: at 400 V line, this contactor handles a motor drawing roughly 3 A full-load, which corresponds to about a 1.5 kW motor at 400 V three-phase. The 690 V rating is there for 690 V line systems (common in mining or heavy industrial), but the current drops to 1 A.
Switching frequency and control reliability
Maximum switching rate is 800 operations per hour under AC-3 load, and 250 ops/h under AC-4 (plugging/reversing duty). That's enough for a conveyor start-stop cycle but not for a high-speed pick-and-place. The auxiliary contacts are rated for PLC-level signals — 17 V, 5 mA minimum switching capability — so you can wire the N/O or N/C directly to a 24 VDC digital input without worrying about oxide-film contact failure.
Coil and control circuit
The magnet coil draws 0.82 W during closing and holds at 0.24 W DC. That low holding power keeps the coil cool in a sealed panel and reduces the burden on a 24 VDC power supply. Surge voltage withstand is 6 kV, pollution degree 3, so it's rated for the dirty, humid environments typical of industrial enclosures without conformal coating.
Mounting and integration details
Mounts on 35 mm DIN rail via the integrated clip — screw-fasten or snap-on, your call. Side-by-side mounting is allowed, so you can gang multiple contactors without a mandatory air gap. The mounting position is flexible: ±180° rotation on a vertical surface, and ±22.5° tilt forward/backward if the panel layout demands it. Wire size: 2 x 0.5 to 1.5 mm² solid/stranded or 2 x 0.75 to 2.5 mm² with ferrules. Screw terminals on both main and control circuits — no spring-cage option on this order code.
Fuse coordination and short-circuit protection
For type 1 coordination (no damage to the contactor, but may need replacement after a fault), use an 80 A gL/gG fuse. For type 2 coordination (contactor remains operational after a fault), step down to a 35 A gL/gG fuse. That's a standard distinction: type 2 is preferred for production-critical lines where you want to clear a fault and restart without swapping the contactor.