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.
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. 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.
Mechanical life of 30,000,000 operations typical.