What it is and where it lands
The Siemens 3RT1017-2KJ82-0LA0 is a SIRIUS S00 power contactor with a 72 V DC coil, spring-loaded terminals on both the main and auxiliary circuits, and a built-in varistor surge suppressor. It's sized for screw and snap-on mounting onto 35 mm standard mounting rail per DIN EN 50022, occupying a 45 mm width, 60 mm height, and 123 mm depth footprint.
Ratings that decide the fit
In AC-2 duty (slip-ring motor starting) at 400 V, it's rated for 5.5 kW, which is the motor power it can handle for that specific application. For AC-4 duty (plugging, inching) at 400 V, the rating drops to 8.5 A — significantly less than the AC-3 rating would be, because AC-4 involves higher switching stress. Pollution degree 3 means it's suited for industrial environments with conductive pollution, not just clean control rooms. The coil draws 11 W on closing and holds at 4 W DC, which matters for power supply sizing in a multi-contactor panel. With type of coordination 2, the required fuse is gL/gG 20 A; for type 1 coordination, it's 35 A. The varistor across the coil handles the inductive kick — no external snubber needed, which saves a terminal and a wiring step.
Lifecycle and sourcing reality
For a BOM line that calls out this exact order code, the supply posture is straightforward: sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time, so send the RFQ with your quantity and target delivery window.
Panel integration notes
The 45 mm width and 123 mm depth fit a standard 35 mm DIN rail enclosure. Side-by-side mounting is permitted, so you can gang multiple units without spacing. The IP20 rating on the front and terminals means it's protected against finger contact but not washdown — keep it inside the panel, not on the machine frame. Operating temperature range of -40 to +70 °C. Mechanical life of 30,000,000 operations typical.