Eaton NZMB2-A40-NA NZM2 MCB - 25 kAIC
Part Number: NZMB2-A40-NA
Quick Summary
NZMB2-A40-NA is an Eaton NZM molded case circuit breaker for distribution protection in industrial panels. When panel space is tight or uptime is critical, you need a protector with reliable tripping characteristics and straightforward installation. Compliances commonly referenced include CE marking, IEC/UL standards, and IP considerations when enclosed in protective housings. Designed around the NZM2 frame and three-pole configuration, it delivers a 40 A rating at 440 Vac with a 25 kAIC short-circuit capacity, compatible with front-screw connections and motor-drive accessories to support scalable, maintainable distribution protection.
Product Information
Extended Description
NZMB2-A40-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, 320-400A, Three-pole, 40A, 440 Vac, 25 kAIC, Distribution circuit protection, 32-40A, 320-400A delayed, Front screw, 32-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-A40-NA
EAN
4015082692094
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 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
40 A
Voltage rating
440 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
320-400A delayed
Setting Range Ol Protector
32-40A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front screw
Overload range
32-40A
Number of poles
Three-pole
Trip rating
320-400 A
Feature → Business Impact → Application: The NZMB2-A40-NA uses a fixed thermal, adjustable magnetic trip (T185) to deliver precise protection for distribution circuits, reducing nuisance trips and safeguarding equipment across panels. Result: improved uptime and reduced maintenance costs in facilities with motor drives and heavy electrical loads. Application: Control panels and switchgear in manufacturing environments benefit from reliable fast-tripping and predictable behavior, even during surge events. Feature → Business Impact → Application: The NZM2 frame with three-pole configuration provides robust fault isolation for multi-phase circuits, enabling compact yet capable protection in compact control cabinets. Result: higher protection density and easier wiring for machine control and automation panels. Feature → Business Impact → Application: Front screw terminals and available rocker lever/motor-drive accessories simplify installation and future upgrades, cutting commissioning time and enabling quick retrofits in crowded control rooms. Application: New installations and modernization projects in industrial facilities seeking efficient, serviceable protection solutions. Feature → Business Impact → Application: 25 kAIC interrupt capacity ensures safe interruption of high-energy faults, supporting compliant motor starts and feeder protection in demanding environments. Result: enhanced electrical safety margins and compliance with distribution protection standards.
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FAQs
To install NZMB2-A40-NA, align the breaker for front screw connections within the panel enclosure and ensure the mounting supports the NZM2 frame. Secure the conductors to the front screws with appropriate torque per local guidelines, then attach the rocker lever or motor-drive accessory as needed. Always follow Eaton installation guidelines and verify proper mechanical seating before energizing.
Key specs include a 40 A amperage rating, 440 Vac voltage rating, and a three-pole configuration. It uses a fixed thermal and adjustable magnetic trip (T185), with a short-circuit breaking/interrupt rating of 25 kAIC. The setting range includes 32-40 A for OL protection, and 320-400 A for delayed short-circuit release, all on the NZM2 frame with front screw connections.
Yes. The three-pole design and 25 kAIC capacity, along with 32-40 A overload and 320-400 A delayed settings, make it well-suited for motor control and distribution panels. Its compatibility with motor-drive accessories and front-screw wiring simplifies integration into existing machine control cabinets while providing reliable protection for feeders and motors.
Compliances are specified as Contact Manufacturer, with typical industry considerations including CE marking and IEC/UL standards for electrical protection equipment. IP rating considerations depend on the enclosure. Always confirm regional regulatory requirements with Eaton or your local distributor before deployment.
Warranty follows Eaton Selling Policy 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first. Support is available through authorized Eaton distributors and service partners, with downloadable policy documentation for reference and terms.