The Schneider Electric EZ9F34450 is a 4-pole miniature circuit breaker from the Easy9 range, rated 50 A with a C-curve trip characteristic (magnetic trip threshold 5–10 × In). Breaking capacity is 4.5 kA Icn at both 230 V and 400 V AC, 50/60 Hz, conforming to IEC 60898-1 — meaning it safely interrupts fault currents up to that level without welding contacts or cascading upstream (cite:). Thermal-magnetic trip technology covers both overload (thermal bimetal) and short-circuit (magnetic coil) protection. Rated insulation voltage (Ui) is 500 V AC, and the breaker is suitability for isolation per IEC 60898-1 — a visual contact position indicator confirms open/closed state (cite:,).
Clip-on mounting to DIN rail — standard 35 mm rail. Occupies 8 modules of 9 mm pitch (72 mm width). Tunnel-type terminals accept 1–35 mm² rigid or 1–25 mm² flexible conductors; tightening torque is 3.5 N·m (cite:,). IP20 finger-safe protection on the front, suitable for enclosed distribution boards. Pollution degree 2 (normal indoor environment) (cite:,).