The Z curve is designed for semiconductor and electronic loads where short-circuit protection must trip fast on low overcurrents — typical for control transformers, PLC power supplies, and DC-side protection in rectifier circuits.
The S800 family uses a modular DIN-rail housing that clips into standard 35 mm rail. The 2-pole width occupies two modular spaces (36 mm), leaving room for auxiliary contact blocks or shunt trips in the same panel footprint.