The Schneider Electric C2534V250 is a MicroLogic 4.2 electronic trip unit for the ComPacT NSX100...250 molded-case circuit breaker platform. It's rated 250 A at 40 °C, 3-pole, 3 protected poles (3D), with integrated earth-leakage protection Class A. That standard covers the breaking and switching performance for low-voltage switchgear — so this unit is certified for the fault-clearing and coordination duties a panel designer expects from a distribution breaker.
Mounts fixed in a ComPacT NSX250 frame. IP40 front face (finger-safe behind the door), pollution degree 3 per IEC 60947-1 — fine for a standard industrial panel environment. The 20-minute thermal memory before and after tripping means the unit remembers the heat history of the conductor; if you clear a fault and re-energize quickly, the trip curve accounts for the residual heat, so nuisance trips on a hot reclose are less likely.
Protection functions are LSoIR: long-time overload (L), short-time short-circuit with fixed delay (So), instantaneous short-circuit (I), and residual/earth-leakage (R). The long-time pickup Ir is adjustable 100–250 A across 9 settings — that's the thermal-magnetic curve's continuous-current threshold. Short-time pickup Isd adjusts 1.5–10 x Ir; instantaneous Ii is fixed at 3000 A. Earth-leakage sensitivity IΔn is adjustable, with time delays Δt selectable from 0 ms to 1 s (0, 60, 150, 500 ms, 1 s). The unit can be switched OFF via the IΔn rotary switch if the installation doesn't require ground-fault protection. Local signaling includes a flashing green LED for ready, red LED at 105% Ir for overload, orange at 90% Ir, and a yellow indicator for residual current.