The single-pole format and 18 mm width (one modular unit) mean it slots into a standard DIN-rail panel without crowding adjacent breakers.
Ratings That Matter for Fit
The 40 A rating at 35 °C is the nominal current; the breaker carries a published derating curve so you can size it for warmer enclosures. At 40 °C it handles 37.56 A, at 50 °C it handles 34.96 A, and at 60 °C it handles 32.16 A. For motor branch circuits you would typically reach for a C or D curve. Breaking capacity: 15 kA per EN 60898 covers the standard domestic/commercial installation; 20 kA per IEC 60947-2 is the industrial rating.
Deployment Context — Panel Integration
Snap-on DIN-rail mounting, any position, with a quick-assembly fastening system. The 70 mm installation depth and 76 mm overall depth mean it fits shallow enclosures where a deeper breaker would foul the gland plate or door. Sealable design allows the panel OEM to lock the toggle position after commissioning.