The MGP0401L1: This is a 1-pole molded case circuit breaker from the PowerPacT 4 range, rated 40 A at 40 °C (thermal-magnetic, TM-D trip unit). The LI protection curve covers thermal overload (L) and magnetic short-circuit (I) — the magnetic trip handles the instantaneous fault clearing. Insulation voltage is 750 V, impulse withstand 8 kV. Electrical durability is 20,000 cycles at rated current, 10,000 cycles at In/2 — typical for a distribution-grade MCCB in panelboard duty. The toggle actuator is manual; no shunt trip or undervoltage release is built in.
Occupies one 35 mm module width. Mounts in any orientation (horizontal or vertical). Phase connection is only — this is a single-pole breaker for line-side protection in a 230 V AC distribution circuit.