Eaton NZMN3-AE400-T Molded Case Breaker - 50 kAIC, 415V
Part Number: NZMN3-AE400-T
Quick Summary
NZMN3-AE400-T is a molded case circuit breaker that protects distribution panels in industrial facilities. Engineers face challenges selecting a device with reliable earth-fault protection and accurate trips across varying loads. This model line supports industry-standard protections and is backed by Eaton's warranty; verify regional certifications such as CE, UL/CSA, and IP suitability. In practice, you gain faster fault isolation, simpler front-screw installation, and long-term reliability for power distribution and motor-drive applications. For procurement teams, the 400 A rating and 690 V AC capability align with mid-to-large plant protection schemes, reducing the need for multiple device types. This makes specification and installation more straightforward for electrical engineers and procurement teams facing tight project timelines.
Product Information
Extended Description
NZMN3-AE400-T 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., Earth fault protection, Front screw
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMN3-AE400-T
EAN
4015081104185
Product Length/Depth
6.535 in
Product Height
5.512 in
Product Width
5.512 in
Product Weight
5.5 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
Special features
Earth fault protection
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
Rated permanent current
400A
Setting Range Ol Protector
200-400A
Short-circuit breaking capacity
50 kAIC
Interrupt rating
50 kAIC at 415 Vac 42 kAIC at 480 Vac
Connection
Front screw
Overload range
200-400A
Number of poles
Three-pole
Feature: Thermal-magnetic trip with T268 settings; Business Impact: Delivers precise overcurrent protection with fast fault clearance, reducing arc energy and equipment damage; Application: Distribution circuits and motor drives across manufacturing lines. Feature: 400 A rated current and 690 V AC capacity; Business Impact: Handles high-load scenarios without nuisance tripping, improving uptime and reducing panel congestion; Application: Main distribution panels in process industries. Feature: Earth fault protection as a standard feature; Business Impact: Enhances safety and fault detection, lowering risk of ground faults in complex installations; Application: Earth-leakage sensitive networks in control rooms. Feature: Front screw connection; Business Impact: Facilitates straightforward installation and field maintenance, saving time during panel upgrades; Application: Retrofit and new installations with constrained access. Feature: Accessories including rocker lever and motor drive; Business Impact: Improves operability and integration with control systems, speeding commissioning; Application: Control gear assemblies and starter panels. Feature: Adjustable overload protector range 200–400 A; Business Impact: Enables fine-tuned protection aligned with load profiles, reducing energy waste and heat rise; Application: Systems with variable loads and motor startups. Feature: 50 kAIC short-circuit breaking capacity at 415 Vac (42 kAIC at 480 Vac); Business Impact: High fault tolerance and improved system reliability in high-energy environments; Application: Industrial substations and feeder circuits. Overall, NZMN3-AE400-T supports efficient, compliant, and cost-effective protection across industrial distribution networks, with compatibility for rocker lever and motor-drive accessories to streamline installation and maintenance.
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FAQs
Begin by isolating power, then verify panel space and bus bar clearances. Use the front screw connections to land conductors per the gauge and torque specifications in the Eaton datasheet. Ensure the device is aligned with the NZM3 frame and that the wiring path minimizes bending. After mounting, perform a factory or on-site checklist test to confirm proper trip operation and earth-fault protection functionality.
NZMN3-AE400-T provides a 400 A rating and 690 V AC operating voltage, with a short-circuit breaking capacity of 50 kAIC at 415 Vac (42 kAIC at 480 Vac). The trip type is T268, and the overload protector is adjustable in the 200–400 A range. These specs support reliable protection for mid-to-large distribution circuits and motor-drive applications.
Yes, earth-fault protection is listed as a special feature for this model. For best results, ensure correct wiring of earth-fault paths and verify coordination with other protective devices in the panel. The combination of 400 A capacity, high breaking capacity, and earth-fault protection helps minimize fault energy and improve safety across the distribution network.
Compliances are provided by the manufacturer; confirm region-specific approvals such as CE, UL/CSA, and IP rating applicability with Eaton based on your installation location. This ensures you meet local electrical codes and safety standards while leveraging the device's protection features for your environment.
With a robust 50 kAIC rating and earth-fault protection, this breaker reduces downtime from faults and nuisance trips. The front-access design simplifies maintenance, while the available accessories support faster commissioning. Warranty terms include one year from installation or 18 months from shipment, whichever occurs first, contributing to predictable total cost of ownership.