Eaton NZMB2-AF225-BT-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-AF225-BT-NA
Quick Summary
The Eaton NZMB2-AF225-BT-NA Molded Case Circuit Breaker provides reliable overcurrent protection for industrial distribution panels. Engineers often struggle with nuisance trips, incorrect trip settings, and retrofit challenges when upgrading legacy panels. CE compliance, IP-rated enclosures, and SIL considerations are critical factors to review—verify exact approvals with Eaton. This 225 A, 440 Vac device leverages the NZM2 frame and front-frame clamp for fast, secure installation, while delivering robust protection in modern automation and power distribution environments. By combining precise trip performance with straightforward maintenance, it supports safer, more efficient electrical systems and improved uptime for manufacturing and process facilities.
Product Information
Extended Description
NZMB2-AF225-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, Three-pole, 225A, 440 Vac, 25 kAIC, Box, Distribution circuit protect., 225-225A, 1500-2500A delayed, Front frame clamp, 225-225A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF225-BT-NA
EAN
4015081072958
Product Length/Depth
5.51 in
Product Height
5.86 in
Product Width
5.86 in
Product Weight
5.17 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.
Certifications
Contact Manufacturer
Amperage Rating
225 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
Adjustment range short-circuit release
1500-2500A delayed
Setting Range Ol Protector
225-225A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
225-225A
Number of poles
Three-pole
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB2-AF225-BT-NA
The NZMB2-AF225-BT-NA uses the NZM2 frame and a three-pole design to deliver coordinated protection for 3-phase distribution circuits, with a clear business impact of reduced fault duration and minimized electrical damage in high-load panels. Its adjustable magnetic trip and fixed thermal mechanism enable precise coordination with downstream protections, supporting applications in machine assemblies and control panels while helping you meet safety and reliability targets. Front-frame clamp terminals simplify retrofits and panel upgrades, reducing installation time and field wiring errors, which translates to lower commissioning costs and faster time-to-produce. The device offers a 25 kAIC interrupt rating at 440 Vac, enhancing fault withstand capability in demanding environments, and the 225 A overload setting ensures appropriate protection for feeder circuits. Accessories like rocker lever and motor drive options further streamline operation, maintenance, and replacement in continuous-production settings. With a Delayed 1500–2500 A short-circuit release option and 225–225 A setting range, you gain precise control over protective characteristics, enabling compliant, economical protection strategies for industrial power distribution. In practice, this means fewer nuisance trips on startup surges, improved arc-flash mitigation, and a smoother transition from legacy breakers to modern NZM2-based protection schemes.
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FAQs
Install the NZMB2-AF225-BT-NA using the front-frame clamp terminals for a secure, quick retrofit on NZM2 frame panels. Ensure three-pole configuration for three-phase protection, bottom-to-top wiring as per enclosure layout, and verify 440 Vac system voltage and 225 A setting. Use the rocker lever and motor drive accessories if required to simplify operation and maintenance.
This device features a fixed thermal mechanism with an adjustable magnetic trip (T185) and a 1500–2500 A delayed short-circuit release setting. The overload range is 225–225 A, and the interrupt rating is 25 kAIC at 440 Vac, making it suitable for protecting feeders and distribution circuits from high fault currents while minimizing nuisance trips during startup surges.
Yes. Its three-pole NZM2 frame, 225 A rating, and 440 Vac capability make it well-suited for machine control and panel distribution in manufacturing and process industries. The front-frame clamp assists with rapid retrofits, and the available accessories support motor drive interfaces and quick-swap maintenance in production environments.
Certifications for this product are managed by Eaton. The data sheet notes Certifications as 'Contact Manufacturer,' so review the latest Eaton approvals for CE, IEC, or other regional marks with your Eaton representative to ensure compliance with your project requirements and local regulations.
The product carries Eaton’s policy 25-000 warranty: one year from the installation date or 18 months from shipment, whichever occurs first. Regular inspection of trip settings, tightening of front-frame clamps, and keeping spare rocker levers or motor drive components on hand can reduce downtime and extend service life, delivering a lower total cost of ownership for critical protection in industrial power systems.