Eaton NZMB1-A40-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-A40-NA
Quick Summary
NZMB1-A40-NA molded case circuit breaker is a three‑pole protection device designed for reliable use in industrial distribution panels. Engineers often struggle with nuisance trips and difficult mounting in compact control spaces; this unit leverages the NZM1 frame and a front frame clamp to simplify installation while delivering robust protection. Certifications for protection devices in this class typically include CE and UL listings, though current approvals should be confirmed with the manufacturer. In addition to safety compliance, its 40 A rating at 480 V and 25 kAIC short‑circuit capacity supports scalable protection, reducing downtime and improving energy management. This makes it a strong fit for distribution circuit protection in automation and manufacturing applications, with compatibility benefits for NZMB1 family lineups and accessible field adjustments.
Product Information
Extended Description
NZMB1-A40-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip type, 320-400A trip rating, Three-pole, 40A, 480 Vac, 25 kAIC, Distribution circuit protection, Rocker lever, 32-40A, Front frame clamp, 32-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-A40-NA
EAN
4015082722531
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
40 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
32-40A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
32-40A
Number of poles
Three-pole
Trip rating
320-400 A
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-A40-NA
Feature → Business Impact → Application: Thermal-magnetic trip type provides precise fault discrimination, reducing nuisance trips while safeguarding valuable equipment in 480 Vac distributions. This translates to improved uptime and lower maintenance costs in automated production lines and switchgear assemblies. Application: Use in medium‑voltage control panels requiring reliable overload protection with fast fault clearance. Feature → Business Impact → Application: 40 A current rating at 480 Vac ensures accurate overcurrent protection aligned with typical motor and drive circuits, helping prevent unnecessary tripping while protecting components from damage. Application: Ideal for machine control panels and process lines where consistent protection is critical for uptime. Feature → Business Impact → Application: Short-circuit breaking capacity of 25 kAIC equips the device to withstand high fault currents common in industrial plants, boosting safety margins and reducing escalation costs during faults. Application: Suitable for distribution circuits serving dense equipment clusters or high‑inrush loads. Feature → Business Impact → Application: Front frame clamp connection enables fast, secure mounting with minimal hardware, accelerating installation and service tasks. Application: Ideal for OEM assemblies and retrofit projects where installation efficiency is a priority. Feature → Business Impact → Application: Rocker lever provides intuitive operation and clear status indication, improving operator confidence and reducing misoperation in daily control routines. Application: Beneficial in panel completions and field replacements where clear access and reliability matter. Feature → Business Impact → Application: Setting range of 32-40 A allows precise tailoring to protected circuits, supporting optimized protection without sacrificing efficiency. Application: Useful in customized load management and routine panel maintenance where fine-tuning is required.
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FAQs
The NZMB1-A40-NA uses a front-frame clamp mounting designed for distribution panels compatible with the NZM1 frame. Ensure enclosure clearance for the rocker lever and secure mounting hardware per Eaton installation guidelines to achieve a robust, serviceable installation.
This device is rated for 40 A at 480 Vac with a short-circuit breaking capacity of 25 kAIC. It is a three-pole protector with a thermal-magnetic trip type (T268) and an adjustable overload setting range of 32-40 A.
Install using the front-frame clamp for secure mounting and verify alignment with the NZM1 frame. Use the rocker lever for operation and confirm wiring accuracy to the front-frame terminals. Follow the manufacturer’s wiring diagram for proper terminals and torque specifications.
Certification details are not specified in the provided data; typical industry certifications for similar devices include CE and UL listings. Please contact Eaton or your distributor to obtain the current certification status and ensure compliance for your region.
Maintenance is typically minimized with a robust thermal-magnetic design and solid front-frame mounting, reducing nuisance trips and service time. The warranty is one year from installation or eighteen months from shipment, whichever occurs first, contributing to predictable ownership costs and faster ROI in uptime-focused operations.