Eaton NZMN3-AEF400-NA Molded Case Breaker - 50 kAIC
Part Number: NZMN3-AEF400-NA
Quick Summary
The Eaton NZMN3-AEF400-NA molded case circuit breaker provides reliable overcurrent protection for 690 V distribution systems. Engineers often struggle with nuisance trips, downtime, and coordination challenges when selecting protective devices for high-energy panels. In practice, buyers look for CE compliance, UL/CSA listings where applicable, and robust IP ratings; verify exact certifications with Eaton for your region. This model offers a 400 A rating, front screw connections, and NZM3 frame support for fast, compliant installations, while optional accessories and adjustable settings enable scalable protection across diverse industries.
Product Information
Extended Description
NZMN3-AEF400-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM3-frame, NZMN3, Thermal-magnetic trip, Three-pole, 400A, 690 Vac, 50 kAIC at 415 Vac, 42 kAIC at 480 Vac, Distribution circuit protect., 400-400A, Front screw, 400-400A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMN3-AEF400-NA
EAN
4015082692780
Product Length/Depth
6.535 in
Product Height
5.512 in
Product Width
5.512 in
Product Weight
15.547 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.
Compliances
Contact Manufacturer
Amperage Rating
400 A
Voltage rating
690 V AC
Trip Type
T268
Circuit breaker type
NZMN3
Frame
NZM3
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
800-4400A delayed
Setting Range Ol Protector
400-400A
Short-circuit breaking capacity
50 kAIC
Interrupt rating
42 kAIC at 480 Vac 50 kAIC at 415 Vac
Connection
Front screw
Overload range
400-400A
Number of poles
Three-pole
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMN3-AEF400-NA
The NZMN3-AEF400-NA delivers robust protection with high fault current handling, reducing downtime and equipment damage during short circuits. This translates to improved line availability and safer maintenance windows in heavy industries like metal fabrication and chemical processing. The front screw terminals simplify field wiring and serviceability, enabling quicker panel upgrades and reduced installation labor. Its 400 A rating and 690 V AC voltage capability provide dependable protection for mid- to large-sized distribution circuits, with a thermal-magnetic trip (T268) ensuring precise coordination with upstream devices. The NZM3 frame and three-pole configuration support straightforward integration into existing switchgear footprints, while adjustable overload and short-circuit settings offer flexible protection strategy. Optional accessories, including a rocker lever and motor drive, enhance operability in automation environments and remote control schemes. For compliance-conscious projects, align with regional certification requirements and Eaton installation guidance to maintain regulatory alignment and safety.
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FAQs
NZMN3-AEF400-NA uses front screw terminals, which simplify wiring during panel upgrades and new installations. Plan for adequate clearance around the device for accessibility, ensure torque compliance per the installation guide, and use the optional accessories such as motor drive or rocker lever to improve operation in automated environments. Proper wiring reduces commissioning time and improves long-term reliability.
This breaker is rated for 400 A and 690 V AC, with a thermal-magnetic trip (T268) and a three-pole configuration. It provides a short-circuit breaking capacity of 50 kAIC at 415 Vac and 42 kAIC at 480 Vac, supporting high fault current environments. The device also offers an adjustable overload range of 400-400 A and setting options for short-circuit release to tailor protection to your system.
Yes, with a short-circuit breaking capacity of 50 kAIC at 415 Vac (and 42 kAIC at 480 Vac), this NZMN3-based breaker is designed for high fault currents typical of mid- to large-scale industrial power distribution. For optimum selectivity, coordinate the breaker setting with upstream protection devices and verify system fault current with a harmonic analysis or short-circuit study.
Eaton offers a standard warranty policy (25-000) covering one year from installation or eighteen months from shipment, whichever occurs first. For maintenance, rely on Eaton’s service documentation and the product datasheet, and coordinate periodic inspections per site safety standards. Keeping documentation up to date helps ensure ongoing protection performance and facilitates asset management reviews.
The unit lists accessories such as a rocker lever and motor drive to enhance operator control and remote actuation compatibility. Front screw connections simplify field installation, and the NZM3 frame with three-pole configuration provides broad compatibility with Eaton’s NZM family and standard switchgear footprints. When planning expansions, verify available accessories and frame compatibility to maintain consistent protection coordination.