Eaton NZMB2-A50-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-A50-NA
Quick Summary
Eaton NZMB2-A50-NA molded case breaker protects distribution circuits by interrupting fault currents in industrial panels. Engineers often struggle with selecting protection that balances reliability, space efficiency, and easy serviceability in demanding environments. Key certifications to verify with the manufacturer include CE marking and IP ratings, with SIL considerations depending on the protection scheme. This solution supports front-screw installation, 440 Vac system operation, and a 50 A rating, delivering dependable distribution circuit protection. In practice, it reduces downtime and simplifies spare-part planning for panel builders and OEMs. With a 25 kAIC interrupt rating and adjustable trip, it aligns with standard industrial safety practices.
Product Information
Extended Description
NZMB2-A50-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, 300-500A trip rating, Three-pole, 50A, 440 Vac, 25 kAIC, Box, Distribution circuit protection, 40-50A, Front screw
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-A50-NA
EAN
4015082692100
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
5.17 lb
Compliances
Contact Manufacturer
Amperage Rating
50 A
Voltage rating
440 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Terminals
Box
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Setting Range Ol Protector
40-50A
Interrupt rating
25 kAIC
Connection
Front screw
Number of poles
Three-pole
Trip rating
300-500 A
Feature: NZM2 frame, NZMB2 designation, three-pole design, and front screw terminations create a compact, robust protection unit for distribution panels. Business Impact: Consistent trip characteristics promote better coordination and fewer nuisance trips, driving higher uptime in critical lines. Application: Well suited to industrial facilities, machine enclosures, and OEM panel builders seeking reliable protection with straightforward wiring and panel mounting.Feature: Fixed thermal trip with adjustable magnetic element (T185) and a setting range of 40-50 A. Business Impact: Precise overcurrent protection tailored to load profiles, reducing thermal stress and extending equipment life; adjustable magnetic trip allows quick adaptation to changing line conditions. Application: Ideal where motor loads or feeders vary, enabling you to dial in protection without replacing components.Feature: 50 A amperage rating, 440 Vac voltage rating, and 25 kAIC interrupt capability in a three-pole configuration with front-connection options. Business Impact: High fault-current withstand supports safe interruption of short circuits, protecting downstream equipment and personnel while limiting panel damage. Application: Suitable for distribution circuits serving conveyors, presses, and assembly lines in medium-to-large industrial environments.Feature: Compact dimensions and weight (4.05 in depth, 7.24 in height, 4.13 in width, 5.17 lb) plus front screw terminals and available accessories (rocker lever, motor drive). Business Impact: Space-efficient installation simplifies retrofits and reduces cabinet footprint; compatible with standard electrical enclosures and mounting patterns. Application: Helpful when upgrading legacy gear or designing compact control panels and distribution boards.Feature: Accessories and compliance considerations (rocker lever, motor drive; Compliances: contact manufacturer) facilitate integration and serviceability. Business Impact: Extends functionality and simplifies maintenance planning; ensures you have the right control options for motor control and drive systems, while ensuring you verify and document approvals with Eaton. Application: Ideal for OEMs seeking modular protection that scales with evolving industrial control architectures.
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FAQs
NZMB2-A50-NA is designed for distribution panels that accept front-screw connections and a three-pole NZM2 frame. It fits standard industrial switchgear enclosures and panelboards compatible with molded-case breakers of this size. Use front-terminal wiring per Eaton installation guidelines, ensuring conductor sizes and torque are correct. Suitable for 440 Vac systems and 50 A circuits with a 25 kAIC interrupt rating.
Key specs include a 50 A amperage rating, 440 Vac voltage rating, three-pole configuration, and a 25 kAIC interrupt capability. The device uses fixed thermal with an adjustable magnetic trip (T185) and provides a setting range of 40-50 A, enabling 300-500 A trip rating. These features support selective protection and rapid fault clearance in industrial panels.
Yes. With a 50 A rating, 25 kAIC interrupt capacity, and 440 Vac operation, this breaker protects feeders and motors in manufacturing lines while tolerating typical fault currents. The front-screw terminals and NZM2 frame simplify installation and future upgrades, making it a practical choice for OEM panels and retrofit projects in conveyors, presses, and assembly areas.
The datasheet indicates Compliances: Contact Manufacturer, so confirm exact certifications with Eaton for your region. In practice, verify CE marking for the EU, regional safety standards, and any UL, CSA, or other approvals required by your facility. Regulatory confirmation ensures inspection-ready documentation and compliant integration into your control architecture.
Expect improved uptime due to reliable fault interruption (25 kAIC) and precise overcurrent protection (40-50 A setting, 50 A nominal) with fewer nuisance trips. Space-efficient front-access installation reduces cabinet footprint and simplifies spares. Accessories like rocker lever or motor drive enhance control flexibility, supporting faster maintenance, reduced downtime, and better lifecycle planning for industrial panels.