EasyPact Solar MCCB — 125 A, 50 kA at 800 V AC
The Schneider Electric SOL40N3E125 is a 3-pole EasyPact Solar MCCB rated 125 A at 40 °C, with a 50 kA breaking capacity at 800 V AC — that N performance level means it clears faults up to 50 kA without upstream cascading, sized for solar distribution panels where high short-circuit currents are expected. The LSI electronic trip unit (ETU) provides three protection curves: L for overload, S for short-time delay (selectivity), and I for instantaneous short-circuit. Thermal memory is built in, so the breaker remembers prior heating and trips faster on repeat overloads — useful for PV strings where partial shading can cause repeated current swings. Rated operational voltage is 800 V AC 50/60 Hz per IEC 60947-2, with an insulation voltage of 1250 V AC.
Fixed backplate mount, 40 mm pole pitch. Front connections top and bottom, screw terminals. Horizontal or vertical orientation allowed — no derating needed for sideways mounting in tight enclosures. IP20 finger-safe enclosure. Dimensions 120 mm wide × 205 mm high × 105 mm deep. Grey (RAL 7015) housing. Operates at 0–2000 m without derating; above 2000 m up to 5000 m with derating per IEC 60947-2. Storage temperature -35 to 85 °C.
Electrical durability 4000 cycles at rated current and voltage; mechanical durability 20,000 cycles. Power dissipation 5 W per pole — total 15 W at full load, relevant for enclosure thermal calculations.