The Siemens 5SY4113-6KK11 is a 1-pole SENTRON miniature circuit breaker rated 13 A with a B tripping characteristic, designed for 400 V AC and up to 72 V DC maximum.
The 13 A rating covers branch circuits up to that continuous load; the 10 kA (EN 60898) breaking capacity is the standard for domestic and light commercial distribution boards, while the 20 kA (IEC 60947-2) rating lets it handle higher fault levels in industrial panels without cascading upstream.
Deployment context
This MCB is rated for railway applications and mechanical engineering / industry, meaning it's built for vibration, temperature swings (-40 °C to +75 °C), and high humidity environments. Halogen-free and silicon-free construction matters in rail and tunnel installations where smoke toxicity and silicone contamination are concerns.