What it is and what it does
The Siemens SIRIUS 3RT1016-1AK14-3MA0 is a size S00 power contactor with three normally open main contacts, designed for switching motor loads in control panels. It is rated for a 120 V 60 Hz coil, so it pulls in cleanly on standard North American control voltages at line frequency. The 45 mm width and screw-and-snap-on mounting onto 35 mm DIN rail (DIN EN 50022) make it a direct fit for any standard panel layout.
Key ratings and what they mean for your application
For motor duty, the contactor is rated 4 kW at AC-2 at 400 V — that covers slip-ring motor starting and reversing. For the tougher AC-4 duty (plugging, inching, reversing under load), it handles 8.5 A at 400 V. At 690 V it can switch a 5.5 kW motor, so it suits 690 V line applications common in mining or heavy industrial sites. The mechanical service life is 30 million operations, which means it will outlast most machines in normal cycling. The auxiliary contact block (integrated) is rated 10 A at 24 V, 6 A at 230 V, and 0.3 A at 220 V — enough for PLC inputs or relay coils in the control circuit. The front face carries IP20, and the terminals are also IP20, so it is safe for finger-probe access inside an enclosed panel. The operating temperature range is -25 to +60 °C, which covers most indoor industrial environments without derating. For short-circuit protection, the contactor is coordinated with a 20 A gL/gG fuse for Type 2 coordination (no welding of contacts) and a 35 A fuse for Type 1 (welding allowed but no fire risk). The main circuit uses screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid/stranded, or up to 2x (0.75 to 4 mm²) — typical for panel wiring up to 4 mm².
Mounting and integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. Side-by-side mounting is permitted, so you can gang multiple contactors without a gap — useful when building a motor control center row. The 45 mm width and 57.5 mm height leave room for auxiliary contact blocks or overload relays on top. Depth is 111 mm, which fits standard 200 mm deep enclosures with clearance for wiring.