Width is 18 mm (1 modular unit), depth 76 mm, height 90 mm. Sealable, halogen-free, silicon-free. Polarity must be observed on the DC supply side (the datasheet notes 'Consider polarity' for the power supply cord position).
Environmental limits and derating
Overvoltage category III applies.
The closest functional peer is the 5SY4116-7CV — same 1-pole C-curve 16 A, same mechanical footprint (18 mm wide, 76 mm deep). The 5SY5116-7CC11 adds DC capability (220 V, 10 kA) and the railway vibration qualification. If your panel was wired for the 5SY4116-7CV, the 5SY5116-7CC11 will drop in without rewiring — same terminal layout, same 1 MW width, same DIN rail clip. The trade-off is the DC polarity requirement: the railway variant expects polarity observance on the DC feed, whereas the AC sibling accepts any orientation.