The 4-pole version (4D protection, neutral left) covers three-phase plus neutral, with the neutral pole protected at 1 x Ir (same as the phase poles). Rated insulation voltage is 440 V AC, and the operational voltage is 415 V AC at 50/60 Hz, both per EN/IEC 60947-2. That means the breaker is designed for 400 V class systems (nominal 400/415 V three-phase). Pollution degree 3 (IEC 60664-1) and overvoltage category III suit it for fixed-installation distribution panels where conductive pollution or condensation may occur.
Mechanical durability is rated at 30,000 cycles, electrical durability at 8,000 cycles at 415 V at rated current. That electrical endurance figure is typical for a distribution-grade MCCB — adequate for panel switching duty but not for frequent motor starting. If the application cycles the breaker more than a few times a day, consider a contactor instead.
Mounts fixed to a backplate via screw terminals — no DIN-rail clip on this one. Connection pitch is 25 mm, and both line and load connections are front-facing, so the breaker can be wired in a panel without rear access. IP20 finger protection means it is safe for enclosed panels but not for washdown environments.