Eaton NZMN3-AEF350-NA Molded Case Circuit Breaker - 50 kAIC
Part Number: NZMN3-AEF350-NA
Quick Summary
Eaton NZMN3-AEF350-NA molded case circuit breaker provides reliable overload protection for industrial distribution panels. Maintenance teams often face nuisance trips and lengthy part lead times that disrupt production schedules; this device addresses those pain points with a robust thermally magnetic trip and a compact footprint. While design details vary by region, this NZM3 frame solution is aligned with industry expectations for high short-circuit withstand and 690 V AC operation, supporting safe, compliant installations. In practice, engineers benefit from easy front‑screw mounting, motor-drive accessory compatibility, and a scalable protection platform that reduces downtime, simplifies panel design, and lowers ownership cost over the equipment lifecycle.
Product Information
Extended Description
NZMN3-AEF350-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM3-frame, NZMN3, Thermal-magnetic trip, Three-pole, 350A, 690 Vac, 50 kAIC at 415 Vac, 42 kAIC at 480 Vac, Distribution circuit protect., 350-350A, Front screw, 350-350A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMN3-AEF350-NA
EAN
4015082692773
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
Amperage Rating
350 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
700-3850A delayed
Setting Range Ol Protector
350-350A
Short-circuit breaking capacity
50 kAIC
Interrupt rating
42 kAIC at 480 Vac 50 kAIC at 415 Vac
Connection
Front screw
Overload range
350-350A
Number of poles
Three-pole
Feature → Business Impact → Application: The NZMN3-AEF350-NA uses a thermally magnetic trip with a 350 A rating and 690 V AC capability, delivering precise protection that minimizes equipment damage during fault events. Business impact: reduces downtime and maintenance costs by preventing cascading failures in feeders and motors. Application: ideal for distribution panels and motor control centers in manufacturing plants where uninterrupted power is critical. Feature → Business Impact → Application: Front screw connections and the three-pole NZM3 frame simplify installation and wiring in standard enclosures, decreasing field labor time and wiring errors. Application: suitable for retrofit projects and new panel builds in automation lines requiring fast, reliable integration. Feature → Business Impact → Application: Adjustable short-circuit release settings (700-3850 A delayed) and a defined OL range (350-350 A) enable precise coordination with upstream protection, improving selective tripping. Application: supports electrical design strategies for layered protection in complex systems. Feature → Business Impact → Application: Accessory options such as rocker lever and motor drive compatibility extend control flexibility, enabling remote operation and easier motor startup protection. Application: common in machine builders' MCCs and panel assemblies. Feature → Business Impact → Application: High short-circuit ratings (50 kAIC at 415 Vac, 42 kAIC at 480 Vac) provide a clear margin for fault events, enhancing system reliability. Application: critical feeders and distribution circuits in energy-intensive environments. Feature → Business Impact → Application: Compact NZM3 frame with three poles supports efficient space utilization in crowded switchgear, reducing panel depth and improving enclosure density. Application: retrofit and new-install projects where footprint matters. Warranty and compliance considerations are included through Eaton’s policy framework, helping customers manage risk and warranties across the project lifecycle.
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FAQs
This three-pole device uses front screw connections and is designed for installation in standard distribution enclosures and MCCs. Its 350 A rating and 690 V AC capability make it suitable for main protection duties in industrial panels, with compatibility for motor-drive accessories and control wiring. Ensure enclosure space accommodates the NZM3 frame and follow Eaton installation guidelines for safe operation.
The breaker employs a thermally magnetic trip (T268) that engages at overload and fault conditions, providing rapid interruption. It offers a short-circuit breaking capacity of 50 kAIC at 415 Vac and 42 kAIC at 480 Vac, ensuring adequate margin for typical industrial fault scenarios and reducing the risk of downstream damage.
Yes. The NZMN3 frame is intended for distribution protection in MCCs and machine panels. Its three-pole design, front mounting, and available motor-drive accessories make it well-suited for motor control applications, enabling safe startup sequencing, protection coordination, and straightforward integration into machine control schemes.
Verify that the installation complies with regional electrical codes and that Eaton documentation for NZM3 products is consulted. While the data shows Compliances as Contact Manufacturer, expected considerations include regional listings (CE/UL as applicable) and warranty terms under Eaton policy 25-000. Always confirm current certifications and installation guidelines with Eaton for your project region.
Investing in this MCCB can reduce downtime through reliable protection and simpler maintenance thanks to intuitive mounting and accessible accessories. The 350 A/690 V rating and high short-circuit withstand help prevent costly fault propagation, while front-accessible wiring and motor-drive compatibility streamline assembly and serviceability, contributing to lower total cost of ownership over the equipment lifecycle.