The Siemens SENTRON 5SY6240-6CC is a 2-pole miniature circuit breaker rated 40 A with a B tripping characteristic, meaning it trips at 3–5 times rated current — standard for residential and light commercial loads where inrush is modest (lighting, general-purpose outlets, small motor circuits). At 35 °C ambient it carries the full 40 A; at 40 °C it derates to 37.6 A, at 45 °C to 36.36 A, at 50 °C to 35.04 A, and at 55 °C to 33.68 A — so if the panel runs hot, the actual load must be reduced accordingly.
Halogen-free and silicon-free construction, rated for pollution degree 3 (industrial environments with conductive or dry non-conductive pollution). Energy limitation class 3 — limits let-through energy under fault conditions. Sealable for anti-tamper applications. Operating temperature range -40 °C to 75 °C, with humidity limits: max 95% up to 55 °C, max 55% up to 70 °C, max 35% up to 75 °C.