Contactor fit and ratings
The Siemens 3RT1026-1AT60 is a SIRIUS power contactor in the S0 frame size, carrying three normally-open main contacts for switching motor loads. Its AC-2 rating of 11 kW at 400 V covers wound-rotor motor duty — the kind you'd see on a conveyor or pump start — while the AC-4 rating of 15.5 A at 400 V handles plugging and inching cycles where the contactor opens under full load current. For resistive loads the AC-12 continuous current is 10 A, so it's not oversized for heater banks; the motor curve is where this part lives.
Mounting and wiring
Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022. The 45 mm width means it occupies one standard module slot in a panel — useful when you're packing multiple contactors in a row. Side-by-side mounting is allowed, so no forced spacing gaps. Main circuit terminals are screw-type, accepting solid conductors up to 2x 4 mm² or stranded up to 2x 10 mm². For AWG, that's 2x 16-12 solid or 1x 8 stranded on the main contacts. Pollution degree 3 rating means it's suited for industrial environments with conductive dust or occasional condensation — typical for a control panel in a factory hall.
Coordination and protection
For Type 2 coordination (no damage to the contactor after a short circuit) the required upstream fuse is gL/gG 35 A. Type 1 coordination (contactor may need replacement after fault) allows a 100 A gL/gG fuse. That's a useful headroom range if you're coordinating with a motor starter or soft starter that has its own fuse spec. The coil draws 10 A at 24 V rated value, stepping down through the voltage range to 0.3 A at 220 V — standard for SIRIUS contactor coils.
Environmental limits
Operating temperature spans -25 to +60 °C, which covers most indoor panel environments. Maximum installation altitude is 2 000 m without derating. The front face carries IP20 protection — finger-safe when mounted in an enclosure, but the terminals themselves are IP00, so live parts are exposed if the contactor is not inside a panel. Mechanical life is rated at 10 million cycles typical, so it's not a wear-item on a normal production line schedule.