Siemens 5SL6225-6 — SENTRON 2-Pole MCB, B-Curve, 25 A
The Siemens SENTRON 5SL6225-6 is a 2-pole miniature circuit breaker rated 25 A with a B-curve trip characteristic, designed for 400 V AC systems at 50/60 Hz. It carries a 6 kA breaking capacity under both EN 60898 and IEC 60947-2, making it suitable for residential and infrastructure branch-circuit protection where the B-curve's magnetic trip between 3–5× In provides fast clearing on short circuits while tolerating moderate inrush from lighting and resistive loads.
B-Curve Trip and Breaking Capacity
The B-curve characteristic (magnetic release at 3–5× In) means the 25 A rating trips magnetically between 75 A and 125 A — a good fit for general-purpose circuits feeding resistive loads, lighting, or small motor loads where inrush stays below that threshold. The 6 kA interrupting rating at 400 V AC, certified to both EN 60898 (household standard) and IEC 60947-2 (industrial standard), covers most commercial and light-industrial fault levels. Each pole dissipates 2.8 W in the hot operating state at rated current — a figure to consider when calculating thermal rise in a densely populated enclosure. The 10 000 mechanical operating cycles typical service life is standard for this class and sufficient for most switching duties short of daily manual operation.
Panel Fit and Environmental Range
Dimensions: 90 mm high, 36 mm wide (2 MW), 76 mm deep with 70 mm installation depth behind the panel. Halogen-free and silicon-free construction meets low-smoke, zero-halogen requirements for public buildings and infrastructure projects. Sealable terminals allow tamper-proofing after commissioning.