Key Parameters Category Description / Value Product Line Eaton NZMH (Air Circuit Breakers) Series / Frame Size NZMH4-AE Rated Current (Iₙ) 1600 A (Fixed rating) Poles 3-Pole & 4-Pole versions are available. Rated Operational Voltage (Uₑ) Up to 690 V AC, 50/60 Hz Rated Insulation Voltage (Uᵢ) 1000 V Rated Ultimate Short-Circuit Breaking Capacity (Iᶜᵘ) Very high, typically 85 kA to 100 kA at 400V AC (IEC 60947-2). The exact value must be verified from the technical data sheet. Trip Unit Type Fixed "AS" Trip Unit • Provides standard non-adjustable or semi-adjustable protection functions (overload and short-circuit). Operation Mechanism Manual stored-energy spring mechanism (allows for quick ON/OFF operation independent of handling speed). Mounting Fixed Mounting (designed for bolted installation in switchgear panels). Standards Compliance IEC/EN 60947-2 Connection Primary power connections are typically made via busbars or large cable lugs bolted to the terminal pads. Standard Accessories The "AS" version typically comes with a basic set of indicators and possibly a few built-in auxiliary contacts. A wide range of additional accessories are available, such as: • Additional Auxiliary Contacts • Undervoltage Release (UV) • Shunt Trip (ST) • Motor Operation Mechanism (for electrical closing) • Mechanical interlocks
