It occupies 4 modular width units (72 mm wide), with a depth of 76 mm and an installation depth of 70 mm — the extra 6 mm gives clearance for the conductors behind the rail.
The closest functional peer is the 5SL4363-7 — same SENTRON family, same C-curve and 32 A rating, but 3-pole instead of 4. The 5SL4363-7 occupies 3 MW (54 mm wide) and carries a higher 10 kA breaking capacity versus the 6 kA on the 4-pole. If your panel was laid out for the 3-pole version and you need 4-pole protection for a three-phase-plus-neutral feed, the 5SL6432-7 won't drop in without a wider DIN-rail slot — you gain one extra pole width. The 4-pole also dissipates 3.1 W per pole in hot state versus 5 W per pole on the 3-pole version, so total heat in the enclosure is roughly comparable (12.4 W vs 15 W).
Environmental range and compliance
The sealable design allows locking the switch position for lockout/tagout procedures.