The 5SY8105-7: At 70 kA (IEC 60947-2), this breaker sits well above the typical domestic MCB rating (6-10 kA). The DC rating is 15 kA per IEC 60947-2, which covers battery banks and DC bus applications. Under UL 1077 and CSA C22.2 No. 235 it's rated 5 kA — that's the supplementary protector rating for North American panels.
Width is 18 mm, depth 76 mm, height 90 mm. Installation depth is 70 mm. Mounts on standard DIN rail, any position.
Derating and environmental limits
Rated 0.5 A at 45 °C ambient. At 50 °C it derates to 0.48 A, at 55 °C to 0.47 A. Humidity tolerance: 95% RH up to 55 °C, 55% RH up to 70 °C, 35% RH up to 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5-25 Hz, 50 m/s² at 25-150 Hz. Halogen-free and silicon-free construction — important for sensitive environments like semiconductor fabs or medical device manufacturing where outgassing can cause corrosion.