Panel fit and protection profile
The Siemens SENTRON 5SL6140-7 is a 1-pole miniature circuit breaker rated 40 A at 400 V AC, with a C-trip curve and 6 kA breaking capacity per EN 60898 (also 6 kA per IEC 60947-2). C-curve means it trips magnetically between 5 and 10 times rated current — suited for motor-starting inrush or transformer loads in residential and infrastructure panels. At 40 °C ambient the continuous rating derates to 37.57 A; at 55 °C it drops to 33.61 A, so a warm enclosure or high-density layout requires headroom below the 40 A label. Occupies one modular-width unit (18 mm) on DIN rail, mountable in any position. Installation depth is 70 mm; overall depth 76 mm. IP20 with connected conductors — protected against finger contact but not washdown, so it belongs inside a panel, not on the machine exterior.
Compliance and documentation
Rated overvoltage category III, pollution degree 2. Sealable and touch-protected. Halogen-free and silicon-free construction. The product designation per IEC 81346-2 and DIN EN 61346-2 is F (circuit protection). Compliance documentation (CE, UKCA, RoHS, REACH) is part of the standard SENTRON declaration pack; the manufacturer provides a declaration of conformity on request.