Eaton NZMB2-AF125-NA NZM Breaker - 125 A, 25 kAIC
Part Number: NZMB2-AF125-NA
Quick Summary
Eaton NZMB2-AF125-NA is a compact three-pole molded case circuit breaker for distribution protection. Upgrading panels often introduces downtime caused by mis-matched trips or awkward wiring access; this model addresses those pain points with front screw terminals and an adjustable magnetic trip for rapid, reliable integration. With a 125 A rating, 440 Vac operation and 25 kAIC fault capability, it fits standard distribution needs while the NZM2 frame ensures straightforward compatibility in retrofit and new builds. In industrial controls and commercial power centers, this breaker helps shorten commissioning cycles, enhances safety, and supports scalable protection strategies across evolving systems.
Product Information
Extended Description
NZMB2-AF125-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, 750-1250A delayed, Three-pole, 125A, 440 Vac, 25 kAIC, Distribution circuit protection, 125-125A, Front screw, 125-125A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF125-NA
EAN
4015082691660
Product Length/Depth
5.9 in
Product Height
7.7 in
Product Width
4.1 in
Product Weight
4.1 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
440 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Setting Range Ol Protector
125-125A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front screw
Overload range
125-125A
Number of poles
Three-pole
Trip rating
750-1250 A delayed
125 A at 440 Vac with 25 kAIC short-circuit capability delivers robust feeder protection, reducing equipment damage and downtime while supporting selective coordination in multi-motor applications. The fixed thermal, adjustable magnetic trip (T185) provides precise protection settings, enabling engineers to tailor performance to load characteristics and startup surges, improving reliability and energy efficiency in busy panel racks. Three-pole construction on the NZMB2 frame (NZM2) supports synchronized shutdown across phases, simplifying protection schemes for distribution circuits and motor feeders. Front screw connections and optional accessories like rocker lever and motor drive streamline installation, maintenance, and field upgrades, minimizing wiring errors and scope creep during panel refurbishments. The setting range of 125–125 A and delayed 750–1250 A trip rating offers a flexible protection envelope for evolving load profiles, while compact dimensions (5.9 in L, 4.1 in W, 7.7 in H) and a 4.1 lb weight ease mounting in tight enclosures.
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FAQs
When installing the NZMB2-AF125-NA into legacy enclosures, ensure front-access wiring space and a compatible NZM2 frame footprint. Verify terminal torque for the front screws, and confirm that the panel bus arrangement supports three-pole coordination with the 125 A setting. The included accessories like a rocker lever or motor drive can simplify retrofits, reducing field wiring time and potential miswiring during upgrades.
Key specs include 125 A amperage rating, 440 Vac voltage rating, and a short-circuit breaking capacity of 25 kAIC. It employs a fixed thermal, adjustable magnetic trip (Trip Type T185) within a 125-125 A setting range and a delayed 750-1250 A trip rating. The device is three-pole with a front screw connection, designed for the NZM2 frame and distribution protection.
Yes. The NZMB2-AF125-NA is designed for distribution protection in three-pole configurations and fits NZM2 frame motor control and feeder applications. Its adjustable magnetic trip supports motor-start surges, while the 25 kAIC fault rating helps protect feeders and MCC sections from high fault currents. The compact dimensions and front-terminal access further simplify MCC installations and future expansions.
Compliances indicate the manufacturer should be consulted for market-specific certifications. In practice, verify that the device meets regional safety standards for 440 Vac distribution equipment, and confirm any CE, UL, or other certifications applicable to your installation. Ensure coordination with existing protection schemes and panel approval documents prior to deployment.
The NZMB2-AF125-NA offers reliable protection with a defined 125–125 A setting and a 750–1250 A delayed trip range, enabling stable coordination with downstream protection. Regular inspection of front-terminal connections, trip setting integrity, and mechanical operation of the magnetic trip reduces unplanned outages. Although maintenance intervals vary by environment, the device’s plug-in-like NZM2 frame compatibility can lower spare-part inventory and accelerate replacements, contributing to shorter downtime and improved total cost of ownership.