Siemens 5SJ4105-7HG41 — SENTRON 1-pole C-curve MCB, 0.5 A
The Siemens 5SJ4105-7HG41 is a 1-pole miniature circuit breaker from the SENTRON 5SJ4 series, rated 0.5 A at 30 °C with a C-curve tripping characteristic — the standard choice for general-purpose branch-circuit protection in industrial control panels where moderate inrush (transformers, contactor coils, small motor starters) is expected. Rated for 60 V DC maximum, it also covers DC control circuits common in 24 V and 48 V automation loops, though the C-curve is primarily selected for AC applications.
At elevated panel temperatures the breaker derates linearly: 0.48 A at 45 °C, 0.46 A at 50 °C, 0.44 A at 55 °C, and 0.42 A at 60 °C. C-curve trips at 5–10× rated current, so a 0.5 A breaker clears between 2.5 A and 5 A magnetic trip — appropriate for protecting a 0.5 A control transformer or a small solenoid bank where the inrush is a few times the load current.
The part is sealable, halogen-free, and silicon-free — relevant for panels that require clean-room or food-grade material restrictions.