Eaton NZMB1-AF40-NA Molded Case Breaker - 25 kAIC
Part Number: NZMB1-AF40-NA
Quick Summary
NZMB1-AF40-NA molded case circuit breaker protects distribution circuits in industrial panels, delivering reliable 40 A protection at 480 Vac in a compact, front-accessible package. End users often confront nuisance trips, crowded layouts, and slow commissioning; this model provides precise thermal‑magnetic protection and straightforward front-frame installation to minimize downtime. Regionally required approvals typically include CE and IEC safety standards (and UL where applicable), ensuring compatibility with modern control systems and compliance workflows. The rocker lever, 3-pole design, and 25 kAIC interrupt rating support coordination with downstream devices while enabling easy retrofits and maintenance planning.
Product Information
Extended Description
NZMB1-AF40-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, 40-40A, Front frame clamp, 40-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-AF40-NA
EAN
4015082722050
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
3 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
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
Trip rating
320-400 A
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-AF40-NA
Feature a 40 A, 480 Vac rating delivers targeted protection for standard loads, reducing the risk of equipment damage and unscheduled downtime; Business Impact: improved uptime and predictable maintenance schedules; Application: distribution panels in manufacturing lines and process controls. Feature thermal-magnetic trip type T268 provides fast discrimination between overloads and short circuits; Business Impact: minimizes nuisance trips while preserving service continuity; Application: motor starters and feeder circuits with variable loads. Feature 25 kAIC short‑circuit rating; Business Impact: high fault-Current withstand ensures protection for high-energy systems and downstream devices; Application: switchgear and main distribution panels in industrial facilities. Feature Front-frame clamp connection simplifies installation and serviceability; Business Impact: faster commissioning and easier retrofits; Application: legacy panels or modular switchboards. Feature 3-pole design delivers true three‑phase protection; Business Impact: reduces risk of imbalanced faults and improves coordination; Application: three‑phase feeders and motors. Feature Rocker lever as an ergonomic operating aid; Business Impact: quicker manual operation with reduced operator fatigue; Application: frequent-access panel assemblies. This combination of compact form factor, robust protection, and straightforward installation supports a lower total cost of ownership through reduced downtime and simplified maintenance, while maintaining compatibility with Eaton accessories and NZM1 frame installations.
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FAQs
NZMB1-AF40-NA uses the front-frame clamp connection and NZM1 frame, enabling straightforward retrofits into compatible Eaton and non-Eaton panels. Verify mounting footprint, clearance for the rocker lever, and spacing in the control enclosure. Ensure wiring terminations match the 40 A rating and three-pole configuration for three‑phase systems.
Key specs include a 40 A amperage rating, 480 Vac voltage rating, 25 kAIC short-circuit withstand, and a T268 trip type. These parameters determine the level of overload protection, fault current interruption capability, and coordination with upstream protective devices. In practice, they support reliable protection of feeders and motors in moderate to high-energy industrial applications.
Yes, with a 25 kAIC interrupt rating the device is designed to interrupt significant fault currents typical of industrial distribution networks. The thermal-magnetic T268 trip mechanism provides selective response to overloads (thermal) and short circuits (magnetic), reducing nuisance trips while ensuring rapid disconnection under dangerous faults.
Confirm regional requirements and manufacturer documentation for CE, IEC, and potential UL approvals. Check that the device’s ratings (40 A, 480 Vac, 25 kAIC) align with system design, enclosure protection, and panel certification. Maintain records for commissioning, inspection, and preventive maintenance to satisfy safety and compliance audits.
The ROI comes from reduced downtime due to reliable protection and faster installation thanks to front-frame mounting. Regular inspections should verify contact wear and trip performance, with periodic testing per maintenance schedules. The device’s robust ratings support long service life in demanding environments, lowering replacement costs and improving panel uptime.