Eaton NZMH3-AEF300-NA NZM3 MCCB - 100 kAIC at 480V
Part Number: NZMH3-AEF300-NA
Quick Summary
NZMH3-AEF300-NA molded case circuit breaker delivers precise overcurrent protection for industrial panel distributions, helping ensure continuous process reliability. In demanding installations, selecting the wrong device can trigger nuisance trips, unplanned downtime, and costly maintenance, so dependable trip characteristics matter. Certification visibility matters; CE marking, UL/CSA approvals, and IP ratings are key considerations—verify the exact approvals for this model with Eaton to avoid compliance gaps in regulated environments. With the NZM3 frame compatibility and front-screw mounting, it integrates into compact control cabinets while delivering robust 300 A, 690 V AC protection and a clear upgrade path for distribution circuits.
Product Information
Extended Description
NZMH3-AEF300-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM3-frame, NZMH3, Thermal-magnetic trip, Three-pole, 300A, 690 Vac, 100 kAIC at 480 Vac, Distribution circuit protection, 300-300A, 600-3300A delayed, Front screw, 300-300A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMH3-AEF300-NA
EAN
4015082692841
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
300 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
600-3300A delayed
Setting Range Ol Protector
300-300A
Short-circuit breaking capacity
150 kAIC
Interrupt rating
100 kAIC at 480 Vac
Connection
Front screw
Overload range
300-300A
Number of poles
Three-pole
Eaton Specification Sheet - NZMH3-AEF300-NA
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Thermal-magnetic trip with a 300 A rating and 690 V AC capability provides precise overload protection and rapid short-circuit interruption. Business Impact: This reduces nuisance trips and protects motors and feeders, lowering maintenance costs and downtime. Application: Ideal for 300 A distribution circuits in industrial panels using the NZM3 frame. Feature: Three-pole design within the NZM3 frame ensures balanced, three-phase protection. Business Impact: Limits fault currents across all phases, preventing equipment damage and unplanned downtime. Application: Suitable for plant-wide switchgear and motor control centers in manufacturing environments. Feature: Front screw connection and a compact footprint support easy installation in tight spaces. Business Impact: Speeds commissioning and reduces enclosure space requirements, improving panel density. Application: Retrofit projects or new builds where space is at a premium. Feature: Adjustable setting range for OL protector (300-300 A) and delayed short-circuit release (600-3300 A). Business Impact: Enables precise coordination with upstream devices and motor starting profiles, reducing nuisance trips and improving selectivity. Application: Feeder circuits and motor drive protection in processing lines. Feature: Accessories such as rocker lever and motor drive option simplify operation and remote control. Business Impact: Improves operability and automation integration, lowering commissioning and maintenance costs. Application: Control panels requiring manual override or remote actuation. Feature: Warranty and datasheet availability provide assurance and technical support. Business Impact: Reduces risk and accelerates procurement decisions in engineering projects. Application: Used by design teams needing documented support for regulatory and project requirements.
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FAQs
The NZMH3-AEF300-NA uses front screw terminals for connection and is designed for the NZM3 frame. For proper installation, ensure panel space supports a 6.53 in width/height, verify mounting clearance for front access, and follow manufacturer guidelines for thermal clearance and voltage rating of 690 V AC. This enables safe, code-compliant integration into control cabinets.
Key specs include a 300 A rating, 690 V AC voltage rating, and a thermal-magnetic trip (T268). It offers a short-circuit interrupt capacity of 150 kAIC and 100 kAIC at 480 VAC, with a setting range of 300-300 A and a delayed short-circuit range of 600-3300 A, tailored for distribution protection and motor loads.
Yes. NZMH3-AEF300-NA is built on the NZM3 frame and features front-screw connection, enabling straightforward integration with compatible NZM3 accessories, rocker lever, and motor drive options. This compatibility simplifies panel design, retrofits, and coordination with upstream protection devices in three-phase systems.
The product data indicates ‘Compliances: Contact Manufacturer,’ so confirm the exact approvals with Eaton for this model. Typical MCCBs in this class pursue CE marking, UL/CSA certifications, and industrial IP protections; verify current certifications with Eaton to ensure regulatory alignment for your region and application.
The device’s robust thermal-magnetic protection, high interrupt capacity, and compact front-access design reduce downtime risk and simplify maintenance. With adjustable protection settings and available accessories, it supports better coordination and longer service intervals, contributing to lower lifecycle costs and improved system reliability in electric distribution.