What it is and what it does
The Siemens 3RT1016-1AU01 is a SIRIUS power contactor in the compact S00 frame size, rated for 10 A at 24 V DC coil voltage. It's built for switching motor loads and resistive loads in control panels, with a screw-type terminal block for both main and auxiliary circuits. The contactor is designed for screw and snap-on mounting onto a 35 mm standard mounting rail per DIN EN 50022, and it supports side-by-side mounting to save panel space. Rated for 50/60 Hz operation, the 3RT1016-1AU01 handles motor starting duty (AC-2) up to 4 kW at 400 V and switching duty (AC-4) at 8.5 A at 400 V. The mechanical life is rated at 30 million operations typical, which gives a solid baseline for high-cycle applications.
Key ratings and what they mean for fit
The 10 A AC-12 rating is the maximum continuous current for resistive loads. For motor loads, the AC-2 rating of 4 kW at 400 V tells you it can start a motor of that size, while the AC-4 rating of 8.5 A at 400 V covers plugging and inching duty. The 24 V DC coil draws the listed current at rated voltage — make sure your control transformer or power supply can handle the inrush. The contactor's ambient temperature range of -25 to +60 °C and pollution degree 3 rating mean it's suited for industrial environments with conductive dust or humidity, but it's not rated for washdown — the IP20 protection on the front and terminals means it's for dry, enclosed panels only. Wire sizing is straightforward: the screw terminals accept solid or stranded conductors from 0.5 to 4 mm² (AWG 20 to 12) for main contacts, and the same range for auxiliary contacts. For type 2 coordination, use a gL/gG fuse rated at 20 A; for type 1, a 35 A fuse is required.