The 3RT2025-4KJ40 is a SIRIUS coupling contactor in Size S0, meaning it occupies the standard 45 mm width and 85 mm height footprint for this frame — the same panel cutout as other S0 contactors, so a swap into an existing S0 backpanel requires no drilling. The 107 mm depth is the dimension behind the panel face; verify clearance to the enclosure door or adjacent devices. The headline ratings are 17 A at 600 V and 14 A at 480 V — these are the maximum continuous currents the main poles can carry at those voltages in AC-1 duty (resistive load). For motor switching, the AC-3 rating governs; the evidence does not list an AC-3 current figure, so the 17 A / 14 A values apply to resistive or general-purpose loads, not to a motor full-load current. If you are switching a motor, the AC-3 rating from the datasheet (not in this record) is the one that decides the fit. The coil circuit is rated for 24 VDC at 10 A, 48 VDC at 2 A, and so on down the DC voltage table — these are the maximum switching currents for the DC coil circuit, not the main pole ratings. The coil connection uses a ring cable lug, so the wiring termination must accommodate that lug type.
These are the minimum air gaps to grounded metal or adjacent devices for the rated insulation. The mechanical endurance of the contactor is typical 10,000,000 operations.