Eaton NZMB1-AF90-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-AF90-NA
Quick Summary
NZMB1-AF90-NA molded case circuit breaker provides precise thermal-magnetic protection for 480 Vac distribution panels. Engineers often struggle with nuisance trips and difficult maintenance when protecting critical loads in crowded plant spaces. Typical region-specific approvals—CE marking for European installations, UL/CSA listings for North America, and appropriate IP ratings—should be verified with the manufacturer. This model combines robust protection with easy installation and a compact footprint, helping reduce downtime and total cost of ownership while supporting reliable distribution circuit protection.
Product Information
Extended Description
NZMB1-AF90-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip, 600-1000A trip rating, Three-pole, 90A, 480 Vac, 25 kAIC, Distribution circuit protection, Rocker lever, 90-90A, Front frame clamp, 90-90A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-AF90-NA
EAN
4015082722517
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
2.45 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
90 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
90-90A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
90-90A
Number of poles
Three-pole
Trip rating
600-1000 A
Feature → Business Impact → Application: The NZMB1-AF90-NA delivers a 90 A amperage rating at 480 Vac with a 25 kAIC short-circuit capacity, enabling reliable load protection and reduced arc-fault risk in feeder circuits. This translates to fewer unplanned outages in distribution panels and motor feeders across industrial plants. Application: ideal for medium-duty panel boards and machine control centers requiring dependable thermal-magnetic protection and fast fault isolation. Feature → Business Impact → Application: Front frame clamp connection and NZM1 frame provide straightforward wiring and secure mounting, reducing installation time and panel space requirements. Application: simplifies retrofit projects and new installations in compact electrical rooms while enabling quick maintenance access. Feature → Business Impact → Application: Rocker lever and three-pole configuration streamline operator interaction and coordinated protection for multi-phase systems. Application: suitable for centralized protection in distribution cabinets and substations. Feature → Business Impact → Application: Setting range OL Protector 90-90A supports precise overload protection, improving selective tripping and equipment longevity. Application: aligns with precise motor and process protection strategies in manufacturing lines. Feature → Business Impact → Application: Short-circuit and interrupt ratings of 25 kAIC enhance fault tolerance in high-current networks, reducing escalation costs and downtime. Application: critical for feeders supplying motors, drives, and heavy loads. Feature → Business Impact → Application: Warranty policy of 25-000 reinforces lifecycle support and service planning. Application: valuable for procurement planning and asset management in industrial environments.
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FAQs
NZMB1-AF90-NA is a three-pole device built on the NZM1 frame with a front-frame clamp connection for straightforward mounting. It fits standard distribution panels operating at 480 Vac and uses a front-access mounting approach, enabling quick wiring and secure attachment. The rocker lever aids operability, while the 2.68 in depth, 5.71 in height, and 3.54 in width keep installation compact in dense panel layouts.
The NZMB1-AF90-NA uses a thermal-magnetic trip mechanism (T268) to differentiate overload from short-circuit conditions. The thermal element handles slow overcurrent, while the magnetic element responds to high fault currents, ensuring fast disconnection with a short-circuit rating of 25 kAIC. This dual action minimizes equipment damage and supports safer, more predictable outage responses.
Yes. With a 90 A rating, three-pole configuration, and 25 kAIC short-circuit capability, this breaker is well suited for distribution panels and motor control centers in industrial environments. Its NZM1 frame and front-frame mounting simplify integration into existing MCCs, while its rugged construction supports continuous operation in demanding manufacturing settings.
Key considerations include using the front-frame clamp connection for secure mechanical mounting and wiring, leveraging the rocker lever for intuitive operation, and respecting the device’s three-pole layout for proper phase alignment. Ensure panel space accommodates the 2.68 in depth and follow manufacturer torque specifications for connections to maintain performance and safety margins.
Warranty follows Eaton Selling Policy 25-000, typically one year from installation or eighteen months from shipment, whichever occurs first. Compliance details are region-specific; check with the manufacturer for CE, UL/CSA listings, or IP ratings applicable to your installation, and confirm that the device meets your local electrical standards before procurement.