Eaton NZMN4-AEF900-NA Molded Case Circuit Breaker - 50 kAIC
Part Number: NZMN4-AEF900-NA
Quick Summary
NZMN4-AEF900-NA molded case circuit breaker protects industrial distribution panels by providing thermal-magnetic protection for power circuits. Upgrading protection schemes often leads to nuisance tripping, extended downtime, and complex field wiring; this device simplifies both installation and maintenance with bolt-on terminals and a front screw design. The unit's 900 A rating at 600 Vac supports large motors, pumps, and process equipment, while 50 kAIC interrupt capacity at 400 Vac handles high-energy faults. UL Listed, IEC Rated, and CSA Certified support global compliance and streamlined supplier qualification for multi-site operations. Designed for heavy-load distribution and motor drive protection, it delivers reliable performance in demanding environments, enabling faster commissioning and lower total cost of ownership.
Product Information
Extended Description
NZMN4-AEF900-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM4-frame, NZMN4, Thermal-magnetic trip type, Three-pole, 900A, 600 Vac, 50 kAIC at 400 Vac, Bolt-on, Distribution circuit protection, Rocker lever, motor drive, Front screw
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMN4-AEF900-NA
UPC
786685631332
Product Length/Depth
8.15 in
Product Height
8.27 in
Product Width
8.27 in
Product Weight
46.2 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
UL Listed IEC Rated CSA Certified
Amperage Rating
900 A
Voltage rating
600 Vac
Trip Type
T268
Circuit breaker type
NZMN4
Terminals
Bolt-on
Frame
NZM4
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Interrupt rating
50 kAIC at 400 Vac
Connection
Front screw
Number of poles
Three-pole
Feature: The NZMN4-AEF900-NA delivers a high-capacity 900 A rating within the NZM4 frame and is rated for 600 Vac with an interrupt capacity of 50 kAIC at 400 Vac. Impact: This enables reliable protection for large motors, pumps, and other heavy loads, minimizing unplanned downtime and reducing coordination complexity in protection schemes. Application: Ideal for distribution panels and motor control centers in manufacturing, water treatment, and process industries where space and reliability are critical. Feature: Thermal-magnetic trip type T268 provides fast, selective tripping with coordination options. Impact: Improves safety and reduces collateral outages by isolating only the faulted circuit. Application: Appropriate for circuits with motor drives and equipment requiring precise fault clearance in harsh environments. Feature: Bolt-on terminals with front screw connections simplify installation and field retrofit. Impact: Reduces commissioning time, improves torque reliability, and facilitates retrofits in occupied panels. Application: Common in retrofit projects and new builds where wiring access is constrained. Feature: Rocker lever and motor drive accessories support easy operation and integration with control schemes. Impact: Enhances operator ergonomics and compatibility with Eaton drive ecosystems, enabling consistent control interfaces. Application: Ideal for panel builders integrating protection with motor control strategies. Feature: Certifications UL Listed, IEC Rated, CSA Certified provide cross-border compliance and supplier readiness. Impact: Streamlines procurement across global sites and reduces qualification overhead for auditors. Application: Global manufacturing environments requiring traceable, standards-aligned protection devices. Feature: Comprehensive warranty offers coverage for one year from installation or eighteen months from shipment. Impact: Protects total cost of ownership and supports service planning. Application: Applicable for deployment across facilities with ongoing maintenance programs.
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FAQs
Install the NZMN4-AEF900-NA using the front screw terminals and bolt-on connections to the bus bars or bus stabs. Ensure correct alignment with the NZM4 frame and torque values per Eaton documentation. Verify field wiring complies with 600 Vac ratings and that the device is secured to the panel DIN rail or mounting surface as specified.
This breaker provides 900 A amperage rating, 600 Vac voltage rating, and 50 kAIC interrupt capacity at 400 Vac. It is a three-pole NZMN4 type with thermal-magnetic (T268) trip, bolt-on terminals, front screw connections, and a rocker lever for easy operation. Applicable on NZM4 frames for distribution protection.
Yes. With a 900 A rating and 50 kAIC interrupt capacity, it accommodates motor drive protection in demanding applications. The front screw and bolt-on terminals simplify installation in motor control centers, while the rocker lever provides quick manual operation. It is well-suited for protection of large motors, pumps, and process equipment.
NZMN4-AEF900-NA is UL Listed, IEC Rated, and CSA Certified, which supports global compliance and cross-border procurement. These certifications demonstrate adherence to safety and performance standards, reducing vendor qualification time and enabling deployment across multi-site facilities with consistent protection devices.
The product carries a warranty of one year from installation or eighteen months from shipment, whichever occurs first. This coverage helps manage maintenance budgeting and supports service planning for industrial facilities, ensuring protection remains reliable during critical production windows.