It's the sort of part you grab off the van when a residential or light-commercial panel needs a new branch breaker and you're not looking to re-engineer the whole enclosure. The C-curve means it holds through motor inrush up to about 5-10x rated current — good for pumps, compressors, and small conveyor drives where you'd get nuisance trips on a B-curve.
Two modular-width units (36 mm wide) snap onto standard DIN rail. Mounting position is unrestricted, so you can lay it sideways or upside-down in a tight enclosure if the conductors allow. IP20 with connected conductors, which is the norm for enclosed distribution boards. Degree of pollution 2, overvoltage category III — it's rated for the fixed-installation side of the meter, not for outdoor exposure without a weatherhead.
Thermal derating — the number that matters in a crowded panel
Rated 20 A at 30 °C ambient, but that drops to 18.79 A at 40 °C and 16.8 A at 55 °C. If you're packing six of these side-by-side in a 40 °C enclosure, you're effectively limited to 18.6 A per pole — plan your load schedule accordingly. Power loss per pole is 2.2 W at rated current, which adds up fast in a multi-way board.
Supplementary devices and compliance
The design accepts installable supplementary devices — shunt trip, auxiliary contacts, alarm switch — so you can add remote trip signalling or status feedback without replacing the breaker. Halogen-free and silicon-free construction, sealable for tamper-proof installations in metered or rental applications.