The Siemens 5SY3225-6 is a 2-pole miniature circuit breaker from the SENTRON 5SY3 family, rated 25 A at 400 V AC with a B tripping characteristic — magnetic trip between 3 and 5 times rated current, so it's suited for resistive and general-purpose loads where inrush is low (lighting, heaters, control circuits), not motor starting. Breaking capacity is 4.5 kA per EN 60898 and 6 kA per IEC 60947-2; at DC it's rated 15 kA max 72 V. The 36 mm width (2 width units) snaps onto a DIN rail via the quick assembly system — any mounting position works, and the terminals accept solid or stranded wire from 0.75 up to 35 mm², so it covers most panel wiring sizes without adapters.
Deployment context — where this breaker lives
The sealable feature (padlockable toggle) lets a site lock it in the OFF position for LOTO procedures. Halogen-free and silicon-free construction matters in clean-room or semiconductor fab environments where outgassing contaminates processes.