The Siemens 5SY4332-8FA is a SENTRON miniature circuit breaker (MCB) rated 32 A at 400 V AC, with a D tripping characteristic and 10 kA breaking capacity per EN 60898. Three-pole construction (3P) in a 54 mm wide, 3-unit housing. Current-production part — sourced to order against an RFQ.
What the ratings mean for fit
The D-curve (tripping characteristic class D) means the magnetic trip activates at 10–20× rated current — designed for loads with high inrush, like transformers, welding equipment, or motor starters. The 10 kA breaking capacity at 400 V AC (per EN 60898) certifies it can safely interrupt a fault current up to that level without welding contacts or cascading upstream. For a 32 A circuit, that's adequate for most industrial sub-distribution panels where the prospective short-circuit current stays under 10 kA. Wire range accepts 0.75 to 35 mm² solid or stranded — covers everything from control-circuit tails to main feeder conductors. Terminal torque spec is 3.5 N·m with screw-type terminals; combined terminal top and bottom allows through-wiring or daisy-chaining without extra connectors. Halogen-free and silicon-free construction matters for installations in clean rooms, semiconductor fabs, or environments where outgassing during a fault could contaminate optics or sensitive surfaces. IP20 with connected conductors — suitable for enclosed panel mounting, not for wet or dust-exposed locations.
Mounting and integration
Snaps onto DIN rail via the quick-assembly system — standard 35 mm rail. Mounting position any; installation depth 70 mm plus the 76 mm overall depth leaves clearance for wiring behind the panel door. Sealable cover option (yes) allows lockout/tagout compliance per site safety procedures.