Eaton NZMB2-A100-BT-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-A100-BT-NA
Quick Summary
NZMB2-A100-BT-NA is a molded case circuit breaker from Eaton designed for distribution panels requiring reliable overcurrent protection. This compact device fits a NZM2 frame and provides fixed thermal with an adjustable magnetic trip, supporting 100 A at 440 Vac and a 25 kAIC interrupt rating for short-circuit events. Engineers often struggle with coordinating protection settings across multi-circuit panels while preserving space and serviceability; this model helps by offering a three-pole configuration with front-frame clamp terminals for straightforward installation. Compatible accessories include a rocker lever and motor drive, expanding control options. As a standard in distribution circuit protection, it balances protection, ease of maintenance, and lifecycle cost.
Product Information
Extended Description
NZMB2-A100-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, 350-350A, Three-pole, 100A, 440 Vac, 25 kAIC, Box, Distribution circuit protect., 80-100A, Front frame clamp, 80-100A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-A100-BT-NA
EAN
4015081074273
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 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.
Compliances
Contact Manufacturer
Amperage Rating
100 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
600-1000A delayed
Setting Range Ol Protector
80-100A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
80-100A
Number of poles
Three-pole
Trip rating
350-350 A
NZM2 frame compatibility and a 100 A rating enable precise fault protection with predictable tripping, reducing downstream damage and unplanned downtime. This translates to shorter mean time to repair and improved panel reliability, especially in multi-circuit distributions where simultaneous fault currents can occur. It is ideal for three-pole protection in 440 Vac industrial networks and supports straightforward retrofits into existing NZM-based panels. Adjustable short-circuit release range of 600-1000 A delayed provides selective coordination with upstream devices, helping avoid nuisance trips during transient faults. The business impact is improved process uptime and safer startup sequences for motors and conveyors. In practice, technicians set the release to match the upstream protection scheme and breaker operating conditions, streamlining commissioning. Front frame clamp terminals provide faster, vibration-resistant terminations during installation and maintenance. The installation advantage reduces assembly time and minimizes torque-related issues. This makes it well-suited for new builds and retrofit projects where space is limited and panel builders value quick, reliable connections. Rocker lever and motor drive accessories extend control options, enabling quick panel customization and easier integration with motor control centers. Compatibility with front-frame clamp terminals, three-pole configuration and NZMB2 type supports standardized installation in modern distribution panels, while a 25 kAIC interrupt rating provides a robust safety margin for demanding loads such as conveyors and HVAC drives. Overload range 80-100 A is matched by the 100 A nominal rating, ensuring protection aligns with typical operating currents and startup transients.
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FAQs
The NZMB2-A100-BT-NA is designed for three-phase distribution panels using the NZM2 frame. It supports 100 A nominal ratings at 440 Vac, with front-frame clamp terminals for straightforward terminations. It fits standard industrial panel boards and can be integrated into existing NZM-based installations with compatible mounting and wiring practices. Accessories such as a rocker lever and motor drive are available to expand control options without replacement.
Key specifications include a 25 kAIC interrupt rating and a fixed thermal with adjustable magnetic trip (T185). The device offers an adjustable short-circuit release range of 600-1000 A (delayed) to help coordinate upstream protection. With a 100 A nominal rating at 440 Vac and three-pole configuration, it provides reliable protection for moderate to high fault currents in industrial networks.
Yes. Its three-pole design, 440 Vac rating, and 25 kAIC interrupt capacity make it suitable for motor control centers and pump circuits in industrial facilities. The front-frame clamp and compatible rocker lever/motor drive accessories simplify installation and enable flexible control schemes, reducing commissioning time and enabling easier modernization of MCCs and pump stations.
Eaton specifies a warranty under policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. Routine maintenance should focus on terminal torque checks, visual inspection of mounting, and ensuring accessories remain properly seated. The durable NZM2 frame design supports long service life in typical distribution applications.
The unit supports overload protection in the 80-100 A range, aligning with its 100 A nominal rating to protect downstream devices during overload conditions. This setting, combined with the adjustable magnetic trip and three-pole arrangement, helps maintain safe operation of 3-phase loads such as motors, conveyors, and HVAC drives, while enabling coordinated protection with upstream breakers.