The Siemens SIRIUS 3RT1517-1BB40-ZX95 is a Size S00 power contactor with a 24 VDC coil, designed for screw-and-snap-on mounting onto 35 mm DIN rail per EN 50022. The coil picks up at 0.85 of rated voltage and drops out at 1.1 of rated voltage.
The DC switching capacity is given per voltage point: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. These are resistive-load (DC-1) figures — inductive loads like DC motor brakes or solenoid valves will need significant derating. The 24 VDC 10 A rating is the one most buyers will use for switching DC power supplies or resistive heater loads in a control cabinet. For AC loads the contactor is rated 6 A at 230 V and 3 A at 400 V — these are AC-1 (resistive) values. If you're switching motor loads (AC-3 duty), the S00 frame typically derates to about 4 kW at 400 V three-phase, but the evidence here only confirms the resistive ratings. The main and auxiliary circuits both carry a rated impulse withstand voltage of 6 kV, which covers standard 400 V distribution with adequate clearance. The maximum permissible DC current at 24 V is listed at 0.01 A — that's not a typo; it's the minimum switching capability for the auxiliary contacts. Below 10 mA at 24 VDC, the contacts may not reliably break the arc. If you're switching low-level signals (PLC inputs, sensor power), verify the load current exceeds this threshold.
Panel Integration — DIN Rail, Clearances, and Wiring
The contactor measures 45 mm wide, 57.5 mm high, and 72 mm deep — a compact S00 footprint that fits standard 45 mm-wide DIN-rail slots. Side-by-side mounting is permitted (zero gap between units), and the required clearance at the side is 6 mm to adjacent components for heat dissipation. Terminals accept solid or stranded wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²) per clamp. The maximum wire size for AC-1 rated current is 2.5 mm².