What this MCB is and where it fits
The Siemens SENTRON 5SL5102-6CC is a 1-pole miniature circuit breaker (MCB) with a B tripping curve, rated 2 A. It is designed for DC circuits up to 125 V with a breaking capacity of 10 kA — so it handles fault currents from battery banks, DC bus lines, or solar combiner boxes without cascading upstream. The B-curve (3-5 In) means it trips fast on moderate overloads, making it a fit for resistive or lightly inductive DC loads where inrush is low. It snaps onto a standard DIN rail and occupies 1 modular width unit (18 mm), so it fits tight panel layouts.
Physical fit and panel integration
The 5SL5102-6CC measures 18 mm wide, 90 mm high, and 76 mm deep — standard SENTRON 5SL form factor. Installation depth is 70 mm behind the panel face. Mounting position is any orientation. IP20 with connected conductors, so it lives inside a closed panel or distribution board. The housing is halogen-free and silicon-free, which matters for environments sensitive to outgassing (clean rooms, medical, food processing).
Key ratings and what they mean for your circuit
Rated DC voltage 72 V maximum per pole, but the description states 125 V DC — that is the voltage at which the 10 kA breaking capacity is certified. The B-curve characteristic (tripping between 3 and 5 times rated current) means a 2 A breaker will hold steady-state loads up to 2 A and trip between 6 A and 10 A. Overvoltage category III and pollution degree 2 confirm it is rated for fixed-installation distribution boards (not just final circuits). Touch protection is built in, and the unit is sealable for tamper-proof metering or rental applications.