The 1 A rated current and C-curve mean this MCB is sized for protecting a low-current final circuit — think lighting strings, control transformers, or small signal loads — where the C characteristic allows a moderate inrush without nuisance tripping (5–10× rated current magnetic release). Rated voltage of 400 V AC matches three-phase line-to-line supply; maximum operating voltage of 440 V AC gives headroom for nominal 400 V networks with tolerance. Terminals accept solid or stranded conductors from 0.75 to 25 mm², tightened to 2.5–3 N·m. The 72 mm width corresponds to 4 width units on a standard DIN rail — the same footprint as four single-pole MCBs side by side.
Deployment context and environment
Rated for ambient temperatures of -25 to +45 °C and storage down to -40 °C, with periodic exposure up to +55 °C and 95% humidity. Mounting position is any, which simplifies panel layout. Halogen-free and silicon-free construction reduces toxic smoke emission in a fire and avoids silicone contamination in sensitive environments. Sealable to prevent tampering after commissioning.