Eaton NZMB2-AF40-BT-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-AF40-BT-NA
Quick Summary
Eaton NZMB2-AF40-BT-NA molded case circuit breaker protects industrial panel distributions. This 3-pole device delivers precise 40 A protection at 440 Vac to support safe fault isolation in automation environments. Certifications and approvals vary by region; the NZMB2 family is designed to be SIL-ready, CE-compliant, and IP-rated where approved, helping regulatory alignment across sites. This provides clear business value by reducing nuisance trips and enabling reliable coordination with upstream protection devices, while offering straightforward installation and serviceability. In practice, this MCCB supports panel protection and easy integration with front-frame mounting, enhancing uptime in manufacturing and process facilities.
Product Information
Extended Description
NZMB2-AF40-BT-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, Box, Distribution circuit protection, 40-40A, 320-400A delayed, Front frame clamp, 40-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF40-BT-NA
EAN
4015081072828
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
4.5 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
Terminals
Box
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 frame clamp
Overload range
40-40A
Number of poles
Three-pole
NZM2 frame with three poles delivers compact, consistent protection for distribution circuits, reducing panel congestion while aligning with standard industrial layouts. This feature translates to a business impact of easier wiring and faster commissioning in new installs or expansions, especially in automation-heavy environments where space is at a premium. The adjustable magnetic trip and fixed thermal element provide precise coordination with downstream devices, lowering the risk of unnecessary outages and enabling more predictable maintenance windows. In applications such as machine control and process panels, users experience improved selectivity and reduced downstream damage, benefiting overall equipment effectiveness and energy management. The 40 A rating at 440 Vac, combined with a 25 kAIC interrupt capacity, supports robustness in moderate to high fault-current environments, improving safety and reliability in low- and medium-voltage distribution. The front frame clamp terminals simplify installation, delivering secure connections with less tooling and training, which translates to faster panel build-outs and reduced field labor costs. Rocker lever and motor drive accessories extend control options for OEMs and integrators, enabling quick retrofit or upgrades without major rewiring. The setting range for overload protection (40-40 A) and the 320-400 A delayed short-circuit range provide precise overcurrent protection, helping protect motors and sensitive loads from damage while maintaining uninterrupted production. Overall, the NZMB2-AF40-BT-NA aligns with industry best practices for distribution circuit protection, panel protection, and maintenance-friendly MCCB deployment across industrial automation projects.
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FAQs
The NZMB2-AF40-BT-NA uses a front-frame clamp connection and NZM2 frame, designed for three-pole distribution panels. It integrates with standard Eaton accessories like rocker levers and motor drives, simplifying mounting in new builds or retrofits. Confirm panel compatibility with NZM2 dimensions and ensure the 40 A rating aligns with downstream protection coordination to avoid nuisance trips.
Key specifications include 40 A amperage rating, 440 Vac voltage, trip type T185, and 25 kAIC short-circuit and interrupt ratings. The device uses fixed thermal protection with an adjustable magnetic release (320-400 A delayed), enabling selective coordination with upstream protection and downstream loads in distribution panels.
Yes. Its 3-pole design, 40 A protection, and front-frame mounting make it well-suited for motor control centers and process panels. The availability of rocker lever and motor drive accessories supports quick motor protection upgrades, while the adjustable magnetic trip aids in coordinating with motor overload protections and downstream devices.
Certification details vary by region and listing status. The NZMB2 family is designed for SIL-ready, CE-compliant, and IP-rated environments where approved. Always confirm the exact regional certifications with Eaton or your local distributor to ensure compliance with your plant standards and regulatory requirements.
With a robust 25 kAIC interrupt rating and long-term reliability of the NZM2 frame, maintenance intervals can be extended due to reduced nuisance trips and dependable protection coordination. The front-frame mounting and available accessories shorten installation and retrofit times, lowering labor costs and improving overall equipment effectiveness (OEE) while protecting critical loads against short circuits and overloads.