Eaton NZMB2-AF50-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-AF50-NA
Quick Summary
Molded Case Circuit Breaker NZMB2-AF50-NA by Eaton delivers reliable distribution protection for industrial panels. When panel downtime or nuisance trips disrupt production, precise trip settings and robust interruption reduce unplanned downtime. In the NZM2 family, this device aligns with common safety practices and regional compliance workflows; verify applicable standards with the manufacturer. Designed for 50 A circuits at 440 Vac, it supports scalable protection in modern automation, while front-terminal wiring and accessible accessories help streamline installation and maintenance for panel builders and integrators.
Product Information
Extended Description
NZMB2-AF50-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, Three-pole, 50A, 440 Vac, 25 kAIC, Distribution circuit protection, 50-50A, 300-500A delayed, Front screw, 50-50A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF50-NA
EAN
4015082691493
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
4.1 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
50 A
Voltage rating
440 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
300-500A delayed
Setting Range Ol Protector
50-50A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front screw
Overload range
50-50A
Number of poles
Three-pole
Feature: Three-pole NZMB2 circuit breaker with a 50 A rating and 440 Vac operation. Business Impact: Ensures dependable distribution protection with high interrupt capability, reducing fault impact on sensitive automation lines. Application: Ideal for panel boards and machine feeders in distributed control systems, enabling reliable uptime and simplified protection coordination. Feature: Fixed thermal with adjustable magnetic trip (T185) and a 300-500 A delayed short-circuit release. Business Impact: Delivers selective coordination and fast fault clearance, minimizing collateral damage in startup circuits and motor drives. Application: Suitable for motors and feeders in automation environments requiring calibrated overload and short-circuit protection. Feature: Front screw connections and NZM2 frame compatibility. Business Impact: Easier wiring and faster field assembly, lowering installation time and improving serviceability. Application: Control panels and retrofit projects where quick access to terminals matters. Feature: Accessories such as rocker lever and motor drive option. Business Impact: Improves operator interaction and expands control flexibility for drive-based applications. Application: Industrial machinery with motor control centers and drive integrations. Feature: Setting range OL protector 50-50A and 50-50A overload range. Business Impact: Precise overload protection, reducing nuisance trips and extending equipment life. Application: Panel protection for distributed circuits with tight tolerance on protection thresholds.
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FAQs
NZMB2-AF50-NA is designed for the NZM2 frame and uses front screw terminals, which simplifies wiring in standard distribution panels. Check your panel’s space for a three-pole device and confirm clearance for 4.05 in length, 7.24 in height, and 4.13 in width. Ensure your busbar and conductor gauges match the 50 A rating and 440 Vac environment. For retrofit projects, verify mounting compatibility and available accessories like rocker levers or motor drive options to match your control scheme.
Key specs include a 50 A amperage rating, 440 Vac voltage rating, and a 25 kAIC short-circuit breaking capacity with an IEC-style trip type T185. It is a three-pole NZMB2 device in the NZM2 frame, featuring fixed thermal and adjustable magnetic trip, along with front screw connections and a 50-50 A overload setting. These attributes support reliable distribution protection for industrial panels.
Yes, the NZMB2-AF50-NA is well-suited for motor protection in automation due to its three-pole configuration, 50 A rating, and adjustable magnetic trip for overload and short-circuit control. The 25 kAIC interrupt capacity provides robust fault handling for motor feeders, while the 300-500 A delayed range supports coordination with upstream protection devices and drive systems in panel assemblies.
Compliance details for this model are managed by Eaton and regionally dependent. Always verify which standards apply in your jurisdiction (for example CE, UL, or regional marks) with the manufacturer or Eaton’s technical documentation. Use the provided EAN 4015082691493 for reference when requesting certificates and ensure installation follows local electrical codes and your project’s safety requirements.
Warranty follows Eaton’s policy 25-000, typically covering one year from installation or eighteen months from shipment, whichever occurs first. For service, maintain front-access terminals for ease of inspection, track trip history for predictive maintenance, and consider optional accessories (rocker lever, motor drive) to extend control capabilities and reduce downtime in routine maintenance tasks.