What this 4-pole D-curve MCB is for
Terminals accept solid or stranded conductors from 0.75 to 35 mm²; tightening torque is 2.5 to 3.5 N·m. Combined terminals top and bottom simplify daisy-chaining busbars.
Overvoltage category III means it is rated for fixed-installation distribution boards, not just downstream equipment. The D-curve trips magnetically at 10 to 20 times rated current (20 to 40 A), so it holds through motor inrush without nuisance tripping. Only magnetic tripping — no thermal element — so it relies on upstream or downstream overcurrent protection for sustained overloads.
Sealable design allows locking the breaker in the off position for lockout/tagout. Touch protection is standard. Humidity tolerance: max 95% RH up to 55 °C, derating to 55% at 70 °C and 35% at 75 °C.