32 A D-curve 4-pole MCB for industrial branch circuits
The Siemens 5SY4432-8FA is a SENTRON miniature circuit breaker rated 32 A with a D tripping characteristic, 4 poles, and a 10 kA breaking capacity at 400 V AC per EN 60898. Rated voltage is 400 V AC across poles, with a maximum DC rating of 72 V. The 4-pole configuration (4P) switches all phases and does not switch the neutral — confirmed by the neutral conductor switching function being set to No. This is typical for 3-phase industrial loads where the neutral is bonded at the panel.
DIN-rail footprint and wiring
The quick-assembly mounting system snaps onto the rail without tools. Accepts solid or stranded conductors from 0.75 to 35 mm² at the screw terminals, torqued to 3.5 N·m. Mounting position is any, which helps in tight enclosures.
Construction features
Sealable design allows locking the breaker in the ON or OFF position for lockout/tagout compliance. Touch protection is integrated on the terminals.