Eaton NZMB1-A20-NA Molded Case Breaker - 25 kAIC
Part Number: NZMB1-A20-NA
Quick Summary
Powerful protection, the Eaton NZMB1-A20-NA molded case breaker safeguards distribution circuits in industrial panels. Rising fault currents and downtime demand dependable trip performance and straightforward installation. Certification details vary by region, but NZM1 frame products typically align with CE and IEC standards, with UL recognition where required—verify with Eaton. The unit features three poles, 20 A, 480 Vac, and a thermal-magnetic trip type T268 with 25 kAIC short-circuit capacity, enabling fast fault clearance. Designed for industrial automation and power distribution, it also offers front frame clamp mounting and a compact footprint for efficient panel design. This combination supports selective coordination and reduced maintenance costs in modern control cabinets.
Product Information
Extended Description
NZMB1-A20-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, 15-20A, Front frame clamp, 15-20A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-A20-NA
EAN
4015082815592
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
15-20A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
15-20A
Number of poles
Three-pole
Trip rating
350 A
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-A20-NA
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Three-pole NZMB1-A20-NA with a 20 A rating and 480 Vac operation. Business Impact: Provides reliable protection for distribution circuits in industrial panels, enabling predictable tripping behavior and safe shutdown in fault conditions. Application: Suitable for machine control panels and power distribution blocks in automation environments. The integrated front-frame clamp simplifies mounting and service, reducing panel depth and labor time during installation. Feature: Thermal-magnetic trip type T268 with 25 kAIC interrupt capacity. Business Impact: Enhances fault withstand and selective protection for high-inrush loads, minimizing collateral shutdowns and warranty costs. Application: Ideal for motor feeders and mixed-load panels in manufacturing lines in which short circuits can occur. Feature: Setting range 15-20 A (Ol Protector) and 350 A trip rating. Business Impact: Allows precise overload protection and scalable protection strategy as load profiles evolve, reducing nuisance trips and maintenance. Application: Useful in existing panels needing adjustable protection without complete reconfiguration. Feature: Front frame mounting and rocker lever actuator. Business Impact: Speeds installation, simplifies field adjustments, and improves user ergonomics during testing and servicing. Application: Preferred in retrofit projects and control cabinet upgrades where quick access is essential. Feature: NZMB1 and NZM1 frame compatibility. Business Impact: Ensures consistency across panel architectures, enabling standardized spare parts and streamlined procurement. Application: Wide adoption in distribution circuits within industrial automation and power distribution systems.
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FAQs
For installation, mount the unit using the front-frame clamp, align electrically with the 480 Vac rating, and secure it as a three-pole device. The rocker lever provides easy status checks, and the 15-20 A adjustable setting helps tailor protection to the connected load. Ensure clearance for heat dissipation and verify panel space before retrofitting.
The 25 kAIC interrupt rating indicates the breaker can safely interrupt high fault currents without internal damage, supporting robust motor start-up protection and feeder safety in heavy-duty applications. This helps maintain system integrity during short circuits and reduces the risk of cascading failures in power distribution networks.
Yes. The NZMB1-A20-NA is designed for 480 Vac distribution panels and industrial automation environments, offering reliable overload and short-circuit protection for three-pole circuits. Its compact NZM1 frame and front-frame mounting simplify panel design and maintenance in control cabinets and machine-automation deployments.
Certification details can vary by region; check the Eaton datasheet and local approvals for CE, IEC, and UL recognition, as applicable. The product teardown and spec sheets outline compliance status, so consult Eaton’s technical documents or contact Eaton directly to confirm the certifications required for your installation location.
Using the NZMB1-A20-NA can reduce downtime through reliable trip performance and selective protection, lowering maintenance costs and unplanned outages. Its front-frame mounting and standardized NZM1 frame compatibility streamline installation and spare-part management, contributing to faster panel upgrades and lower lifecycle costs.