Eaton NZMB1-AF125-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-AF125-NA
Quick Summary
The Eaton NZMB1-AF125-NA molded case circuit breaker provides reliable protection for distribution panels by interrupting fault currents with thermal-magnetic action. In busy electrical rooms, nuisance trips and difficult retrofit processes can slow maintenance and drive downtime. This unit aligns with industry-standard protection practices and is documented for region-specific compliance through Eaton, with details available from the manufacturer. While the base data shows a 125 A at 480 Vac rating and a 25 kAIC short-circuit capacity, regional certifications should be verified. Leveraging the NZM1 frame and front-frame clamp, it delivers predictable protection, reducing total cost of ownership and improving panel reliability for industrial automation environments.
Product Information
Extended Description
NZMB1-AF125-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip, 750-1250A delayed trip rating, Three-pole, 125A, 480 Vac, 25 kAIC, Distribution circuit protection, 125-125A, Front frame clamp, 125-125A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-AF125-NA
EAN
4015082815585
Product Length/Depth
3.54 in
Product Height
3.32 in
Product Width
3.32 in
Product Weight
3 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
125 A
Voltage rating
480 Vac
Trip Type
T268
Circuit breaker type
NZMB1
Frame
NZM1
Class
Distribution circuit protection
Accessories
Rocker lever
Setting Range Ol Protector
125-125A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
125-125A
Number of poles
Three-pole
Trip rating
750-1250 A delayed
Feature → Business Impact → Application: 125 A amperage rating at 480 Vac supports standard distribution circuits in industrial panels, enabling safe, controlled power feeder protection while minimizing nuisance trips and equipment wear. This translates to improved uptime and predictable ABB/Siemens-compatible coordination in Eaton–based panels. Application: distribution circuit protection for motor starters and feeders in manufacturing lines. Feature → Business Impact → Application: 25 kAIC short-circuit breaking capacity increases fault current tolerance, reducing the likelihood of cascading outages and supporting safer startup sequences in high-demand loads. Application: electrical rooms serving pumps, conveyors, and press lines. Feature → Business Impact → Application: Thermal-magnetic trip (T268) provides selective protection for overloaded circuits, improving fault isolation, reducing collateral damage, and easing maintenance planning. Application: retrofit and new builds requiring reliable overcurrent protection. Feature → Business Impact → Application: Front frame clamp connection supports straightforward installation and field replacement, cutting installation time and enabling quick panel upgrades. Application: retrofit projects and new installations using the NZM1 frame. Feature → Business Impact → Application: Rocker lever accessories simplify operating ergonomics and status indication, boosting operator confidence and reducing setup errors. Application: control panels with frequent manual interactions. Feature → Business Impact → Application: Setting range of 125–125A ensures precise configuration for match to load profiles, improving protection coordination and minimizing unnecessary trips. Application: custom distribution schemes and energy management deployments.
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FAQs
Replacement involves confirming compatibility with the NZM1 frame, removing the existing unit, and mounting the NZMB1-AF125-NA using the front frame clamp. Verify the three-pole configuration, 125 A rating, and 480 Vac supply, then reconnect the load side and verify proper clearance. Use the rocker lever accessory if provided to ensure correct operation.
A 25 kAIC interrupt rating means the breaker can safely interrupt high fault currents without damage to the device or wiring. This reduces the risk of arc faults spreading, minimizes downtime from fault events, and improves panel reliability for motor drives and feeders in demanding industrial environments.
Yes. The product is specified for 480 Vac operation with a 125 A rating and three-pole configuration, making it suitable for distribution panels in industrial settings. Ensure proper clearances, panel compatibility with the NZM1 frame, and region-specific compliance documentation before deployment.
Compliance details are provided by Eaton and may vary by region. The datasheet lists 'Compliances: Contact Manufacturer' so confirm your region’s approvals (such as CE/UL where applicable) with Eaton or your distributor before procurement and installation.
Expect reduced downtime from lower nuisance trips due to precise thermal-magnetic protection, faster installation with front-frame mounting, and longer component life from robust 25 kAIC fault interruption. These factors translate to lower maintenance costs, enhanced panel reliability, and quicker project payback in high-demand production lines.