Eaton NZMB2-AF40-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-AF40-NA
Quick Summary
The Eaton NZMB2-AF40-NA molded case circuit breaker protects distribution circuits in industrial and commercial electrical panels. Choosing the right trip settings for varying loads can be challenging, risking nuisance trips or insufficient protection. Compliance details vary by region; check with Eaton for certifications such as CE, UL, or CSA. With a 40 A rating and 440 Vac operating voltage, this unit delivers reliable overcurrent protection while maintaining a compact footprint for panel space optimization. Designed for front-screw installation and easy motor-drive compatibility, it supports streamlined assemblies and faster commissioning while helping you meet safety and uptime targets.
Product Information
Extended Description
NZMB2-AF40-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, Three-pole, 40A, 440 Vac, 25 kAIC, Distribution circuit protection, 40-40A, 320-400A delayed, Front screw, 40-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF40-NA
EAN
4015082691479
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
5.17 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
40-40A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front screw
Overload range
40-40A
Number of poles
Three-pole
Three-pole NZM2 frame construction provides synchronized protection across all three phases, improving coordination for three-phase motors and loads. This translates to reduced risk of unbalanced faults and fewer unexpected shutoffs in busy production lines, enabling smoother uptime in manufacturing and process control environments. The fixed thermal, adjustable magnetic trip (T185) allows precise tailoring of protection to your system’s fault current profile, supporting selective coordination and minimized downtime during faults. With a 320-400 A delayed short-circuit release range, you can align protection with upstream devices, enhancing reliability in high-inrush applications such as conveyors and motor drives. A 40 A, 440 Vac rating and 25 kAIC interrupt capacity ensure robust fault handling, reducing damage and downtime during faults in distribution feeders. Front screw termination simplifies wiring, enabling quicker panel wiring, easier retrofits, and improved maintenance efficiency. Accessories like rocker lever and motor drive compatibility expand control options, while the 40-40 A overload range supports straightforward regional configurations. Warranty and service from Eaton add predictability to total cost of ownership, especially in environments demanding high reliability and fast issue resolution.
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FAQs
The NZMB2-AF40-NA uses front screw connections, enabling straightforward wiring within standard panel layouts. Its three-pole NZM2 frame design supports compact installation in distribution boards and motor control centers, while maintaining clean field wiring and easy future upgrades.
This device features fixed thermal and adjustable magnetic trip (T185). It is rated for 40 A with a short-circuit release range of 320-400 A (delayed) and an overload range of 40-40 A, with a short-circuit current rating of 25 kAIC at 440 Vac.
Yes. The three-pole design, 40 A rating, 440 Vac operating voltage, and 25 kAIC interrupt capacity make it well-suited for distribution protection in industrial panels, switchgear, and motor control centers where reliable, coordinated protection is required.
Compliance details are region-specific and may require confirmation with the manufacturer. The product lists Compliances as 'Contact Manufacturer,' so verify CE, UL, CSA, or other regional certifications with Eaton before procurement for your target market.
The unit carries a one-year warranty from installation or eighteen months from shipment, whichever occurs first, per Eaton policy. Its robust fault current rating and modular accessories (rocker lever, motor drive) support easier commissioning, lower downtime, and smoother aftermarket service in demanding industrial environments.