Eaton NZMB1-AF20-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-AF20-NA
Quick Summary
NZMB1-AF20-NA is a compact molded case circuit breaker designed for distribution protection in industrial switchgear. It helps prevent unplanned downtime by delivering precise thermal-magnetic tripping in three-phase loads. Engineers often struggle with space constraints and nuisance trips, and this unit addresses those challenges with a front-frame clamp and rocker lever for faster installation and safer operation. For regional applicability, CE marking and IEC-based standards are commonly pursued for NZM1-family breakers; confirmation with Eaton is recommended to ensure exact compliance in your market. With a 20 A setting at 480 Vac and 25 kAIC capacity, it supports scalable protection while preserving panel real estate. This device also aligns with maintenance-friendly, modular panel strategies for lean manufacturing environments.
Product Information
Extended Description
NZMB1-AF20-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip type, 350A trip rating, Three-pole, 20A, 480 Vac, 25 kAIC, Distribution circuit protection, Rocker lever, 20-20A, Front frame clamp, 20-20A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-AF20-NA
EAN
4015082815547
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
20 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
20-20A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
20-20A
Number of poles
Three-pole
Trip rating
350 A
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-AF20-NA
Feature: 20 A amperage rating at 480 Vac with a thermal-magnetic trip (T268). Business Impact: Delivers precise, selective protection for three-phase feeders, reducing nuisance trips and minimizing downtime. Application: Ideal for distribution circuits in industrial panels and machine rooms. Feature: Front-frame clamp mounting and a rocker lever. Business Impact: Speeds up installation, improves wiring clarity, and enhances field serviceability. Application: Suitable for retrofit in existing NZM1 frame panels and new builds. Feature: Short-circuit capability of 25 kAIC. Business Impact: High interrupting capacity protects equipment during faults, lowering repair costs and downtime. Application: Critical feeders and motor circuits with potential fault currents. Feature: Setting range 20-20A (Ol Protector). Business Impact: Provides configurable protection to match diverse loads without replacing the device. Application: Adjustable protection for mixed workloads in distribution systems. Feature: Three-pole NZMB1, NZM1 frame, distribution circuit protection. Business Impact: Ensures balanced trip coordination across phases, improving overall system reliability. Application: Standard pick for industrial control panels and switchgear deployments. Feature: Compact footprint and modular design. Business Impact: Maximizes panel density and simplifies future expansions or upgrades. Application: Suitable for compact switchgear in space-constrained facilities.
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FAQs
The NZMB1-AF20-NA uses a front-frame clamp mounting suitable for NZM1 frame panels. Begin by inspecting the panel space, align the breaker with the frame rails, secure using the front-frame clamp screws, and connect conductors to the designated terminals. Verify alignment, verify torque per manufacturer guidelines, and perform a functional test to confirm proper tripping and reset operation.
Key ratings include a 20 A continuous current rating, 480 Vac operating voltage, 25 kAIC short-circuit breaking capacity, and a three-pole configuration. The trip type is thermal-magnetic T268, with an NZM1 frame and rocker lever mechanism. These specs support reliable protection for distribution circuits while enabling straightforward panel integration.
Yes. Its three-pole design, 25 kAIC interrupt capacity, and 480 Vac rating make it suitable for motor feeders and distribution circuits in industrial control panels. The compact form factor and front-frame clamp ease installation in space-constrained cabinets, while the thermal-magnetic trip provides fast, selective protection for motors and loads.
Exact regional certifications depend on the market. The NZM1-based family typically aligns with CE marking and IEC standards; however, compliance should be confirmed with Eaton for your jurisdiction. When ordering, request the specific compliance documentation for your panel design and local electrical codes to ensure regulatory conformity.
The unit’s robust thermal-magnetic protection reduces nuisance trips, minimizing downtime and maintenance costs. Its modular NZM1 frame compatibility simplifies upgrades and retrofits, while the rocker lever and front-frame clamp speed servicing and reduces field labor. Combined with Eaton’s warranty, this delivers predictable lifecycle costs and faster time-to-value in lean manufacturing environments.