The Schneider Electric EZC100H1063 is a 1-pole EasyPact EZC100H circuit breaker with a thermal-magnetic trip unit (TM-D) rated 63 A at 50 °C. It carries a 5 kA Icu breaking capacity at 380–400 V AC 50/60 Hz per IEC 60947-2, which is the figure that governs its use in standard 400 V distribution panels — at 240 V AC that same rating climbs to 25 kA, and at 125 V DC it holds 10 kA.
If your panel runs hotter, you derate; if it runs at 40 °C, the same breaker is rated 63 A — so the 50 °C figure is the conservative one. Below 240 V AC the same breaker handles 25 kA, so it's not a weak unit — it's sized for the 400 V distribution tier. The TM-D trip unit is the standard fixed-trip version — no interchangeable rating coils, no electronic adjustment. For a fixed-load branch circuit where you don't need field-adjustable trip settings, this keeps the BOM simple. The breaker is certified for isolation per IEC 60947-2, meaning you can use it as a disconnecting means with a visible gap when toggled off — the positive contact indication confirms the contact position visually.
This is a fixed-mount backplate-mounted breaker with front-front connections — both line and load terminate on the front face. The 25 mm width and 25 mm connection pitch are standard for a 1-pole miniature-frame breaker; it occupies one 25 mm module on a DIN rail or backplate. IP20 means finger-safe from the front but not sealed against dust ingress — fine for a closed panel, not for washdown areas. Mechanical durability is 13,000 cycles — that's the number of on-off operations before the mechanism wears out, not the electrical endurance under load. For a distribution breaker that cycles a few times a year, that's effectively a lifetime.