The Siemens 5SY4504-8CV is a 1P+N miniature circuit breaker with a D4 tripping characteristic and a rated short-circuit breaking capacity Icu of 15kA at 230/400V.
Panel Fit & Integration
Snap-on DIN rail mount for standard 35 mm rail. The 1P+N form factor (single protected pole plus switched neutral) occupies one modular unit of width — keeps the enclosure fill factor tight.