Eaton NZMH3-AEF400-NA Molded Case Breaker - 150 kAIC
Part Number: NZMH3-AEF400-NA
Quick Summary
The Eaton NZMH3-AEF400-NA molded case breaker protects electrical distribution panels in industrial facilities. For design engineers facing nuisance trips and insufficient fault-current protection, its thermal-magnetic trip and adjustable settings help prevent outages. Typical regulatory considerations for NZM3 family products include CE and UL compatibility—verify with Eaton for your region to ensure local compliance. This model supports 400 A protection at 690 V AC with a front-screw connection for straightforward installation, featuring 150 kAIC short-circuit capacity and a 100 kAIC interrupt rating at 480 Vac. By combining robust protection with modular accessories like rocker levers and motor drive options, it enables faster commissioning and reliable operation, reducing total cost of ownership in demanding industrial environments.
Product Information
Extended Description
NZMH3-AEF400-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM3-frame, NZMH3, Thermal-magnetic trip, Three-pole, 400A, 690 Vac, 100 kAIC at 480 Vac, Distribution circuit protection, 400-400A, 800-4400A delayed, Front screw, 400-400A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMH3-AEF400-NA
EAN
4015082692865
Product Length/Depth
5.51 in
Product Height
6.53 in
Product Width
6.53 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
400 A
Voltage rating
690 V AC
Trip Type
T268
Circuit breaker type
NZMH3
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
150 kAIC
Interrupt rating
100 kAIC at 480 Vac
Connection
Front screw
Overload range
400-400A
Number of poles
Three-pole
Feature → Business Impact → Application: The NZMH3-AEF400-NA integrates a thermal-magnetic trip within a three-pole NZM3 frame, delivering precise overload and short-circuit protection. This translates to improved device selectivity, reduced nuisance trips, and safer distribution panels in manufacturing lines and process facilities. Application-wise, it supports centralized protection in industrial switchgear where 400 A at 690 V AC is typical and where rapid fault clearance minimizes downtime. Feature → Business Impact → Application: A high short-circuit breaking capacity of 150 kAIC (with 100 kAIC at 480 Vac) provides strong fault tolerance in networks with diverse loads and high inrush. This reduces the risk of collateral equipment damage and helps maintain production continuity in power-intensive environments. Feature → Business Impact → Application: Front screw connections and a compact NZM3 frame simplify installation and serviceability, enabling faster panel wiring, easier commissioning, and scalable integration in both new builds and retrofit projects. Feature → Business Impact → Application: The 800-4400 A delayed adjustable short-circuit release and 400-400 A OL protector settings offer flexible coordination with upstream protection devices, helping engineers tailor protection to specific machines, conveyors, or presses. Feature → Business Impact → Application: Accessories such as rocker lever and motor drive options improve operator ergonomics and control interface compatibility, supporting safer maintenance and streamlined automation workflows in control cabinets. Feature → Business Impact → Application: The unit’s documented dimensions and weight (5.5 lb; 5.51 in depth, 6.53 in height and width) support accurate space planning, optimized enclosure design, and predictable procurement for OEMs building modular electrical panels.
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FAQs
The NZMH3-AEF400-NA uses front screw connections and fits the NZM3 frame, enabling straightforward panel mounting and wiring. For optimal performance, ensure alignment with the three-pole configuration and verify clearance around the device for heat dissipation. Use the rocker lever accessory for easier operation and consider motor-drive options if remote control is required. Always follow Eaton’s installation guidelines and local electrical codes for a safe, compliant setup.
Key specs include a 400 A amperage rating, 690 V AC voltage rating, and a short-circuit breaking capacity of 150 kAIC (100 kAIC at 480 Vac). The trip type is thermal-magnetic (T268), with an adjustable short-circuit release range of 800–4400 A and an OL protector setting of 400–400 A. These values guide coordination with upstream protection, ensuring selective tripping and minimized inrush disruption while protecting feeders and motors.
Yes, for many industrial distribution applications, the NZMH3-AEF400-NA provides robust protection with a high fault-current withstand (150 kAIC) and a 690 V AC rating. However, respect regional compliance requirements and enclosure rating needs; the product notes indicate compliance should be confirmed with the manufacturer. When deploying in harsh environments, ensure proper enclosure protection and consider installation accessories to optimize reliability.
Compliances are listed as Contact Manufacturer for this model, so verify with Eaton for your region and target market. In practice, confirm regulatory approvals such as CE, UL, or CSA eligibility based on your installation location and applicable standards. This helps ensure market readiness, proper documentation, and ongoing maintenance support for global deployments.
The NZMH3-AEF400-NA offers dependable, long-life protection with a one-year Eaton selling policy from installation or eighteen months from shipment, whichever comes first. Its modular accessories and straightforward front-screw installation reduce commissioning time and spare parts cost. Ongoing maintenance is typically limited to periodic functional checks and torque verification, contributing to lower maintenance labor and improved uptime over the device's service life.