What this MCB does on a DC bus
The Siemens 5SL5802-7 is a 2-pole miniature circuit breaker rated for 110 V DC with a 6 kA interrupting capacity. That 6 kA figure is what matters most here — it tells you this breaker can safely clear a fault up to 6,000 amps on a 110 V DC circuit without welding its contacts or blowing apart. The C-curve (magnetic trip between 5x and 10x In) means it's built for moderate inrush loads like small DC motors, solenoid valves, or control transformers where the startup surge won't nuisance-trip a C-curve but would pop a B-curve. At 2 A rated current, this is a branch-circuit or load-side protector, not a main feeder breaker. The 2-pole configuration on a DC system gives you both positive and negative line protection in one 18 mm wide package — that's a single module width on a DIN rail, so it fits tight panel layouts without eating up rail space.
Lifecycle and compliance
RoHS compliance is confirmed effective February 28, 2022. The REACH Article 33 declaration notes lead (CAS-No. 7439-92-1) above 0.1% w/w in the current candidate list — standard disclosure for electrical components with lead-bearing solder joints or contact materials. No UL or IEC certification numbers are listed in the available data, so verify local code acceptance if your jurisdiction requires a specific mark.
Panel fit and wiring
Width is 1 MW (18 mm) — one standard modular unit on a DIN rail. The 2-pole design occupies that single slot, so it's space-efficient for multi-circuit DC distribution boards. Packaging dimensions are 93 x 21 x 83 mm, which is the shipping carton size; the installed depth is less once clipped onto the rail.