Eaton NZMB2-S12-BT-CNA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-S12-BT-CNA
Quick Summary
The Eaton NZMB2-S12-BT-CNA molded case circuit breaker protects motor circuits and feeders in industrial control panels. Engineers often struggle to balance reliable protection with compact panel space and easy serviceability. For this family, critical considerations include potential certifications such as CE, SIL, and IP; verify current approvals with Eaton since the Compliances field for this model indicates 'Contact Manufacturer.' By leveraging the NZM2 frame, magnetic-only trip, and front frame clamp, you gain installation simplicity and predictable, fast tripping for 12 A circuits at 440 Vac, with a 25 kAIC short-circuit rating. This translates to reduced downtime, improved motor protection, and streamlined maintenance in modern automation environments.
Product Information
Extended Description
NZMB2-S12-BT-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, Three-pole, 12A, 440 Vac, 25 kAIC, Box, Motor protection without overload release, Rocker lever, motor drive, 80-140A delayed, Front frame clamp
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S12-BT-CNA
Model Code
NZMB2-S12-BT-CNA
EAN
4015081073214
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
12 A
Voltage rating
440 Vac
Trip Type
Magnetic only
Circuit breaker type
NZMB2
Terminals
Box
Frame
NZM2
Class
Motor protection without overload release
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
80-140A delayed
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Number of poles
Three-pole
Power Xpert Protection Manager x64
Eaton Specification Sheet - NZMB2-S12-BT-CNA
Intelligent power starts with accurate, actionable data
Feature → Business Impact → Application: The NZMB2-S12-BT-CNA uses a magnetic-only trip with a 25 kAIC short-circuit rating, delivering fast, selective protection for motor circuits and feeders. This improves system uptime and protects expensive drives from transient faults, enabling consistent performance in manufacturing lines and packaging equipment. Application: motor protection for small to medium drives in control panels and switchgear. Feature → Business Impact → Application: Three-pole design with front frame clamp and box terminals simplifies wiring and mounting in tight enclosures, reducing installation time and risk of misconnection. This supports rapid deployment in new lines or retrofits in OEM machines. Application: compact motor starters, conveyors, and pump packages where space is at a premium. Feature → Business Impact → Application: NZM2 frame compatibility and adjustable short-circuit release (80-140 A delayed) provide tailored protection across motor sizes, improving selectivity and coordination with upstream breakers. Application: drive-ready protection for motors with varying inrush and startup profiles. Feature → Business Impact → Application: Rocker lever and motor-drive accessories streamline operator interaction and automatic control integration, reducing setup errors and enabling quick manual testing. Application: maintenance-friendly panels and retrofit projects. Feature → Business Impact → Application: 12 A rating with 440 Vac supports standard industrial power levels, while 25 kAIC capacity handles high fault currents, delivering robust protection for critical equipment. Application: process lines, packaging systems, and machine tools requiring dependable motor protection in a compact form factor.
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FAQs
Yes. The NZMB2-S12-BT-CNA is a three-pole molded case circuit breaker designed for motor protection in panel boards and switchgear. With a front frame clamp connection and box terminals, it supports straightforward wiring, reliable magnetic trip operation, and easy coordination with upstream protection devices on three-phase motor circuits.
Key specs include a 12 A amperage rating, 440 Vac voltage rating, three poles, magnetic-only trip, NZMB2 circuit breaker type, and 25 kAIC short-circuit breaking capacity. The device belongs to the NZM2 frame family and features a front frame clamp with box terminals for secure, reliable installation.
The front frame clamp design simplifies mounting in control panels, reduces installation time, and improves PCB and enclosure alignment. It minimizes wiring errors and allows faster field retries after maintenance, which is beneficial for OEMs and technicians working on motor drives and compact switchgear.
You can access the Eaton Specification Sheet for NZMB2-S12-BT-CNA, Power Xpert Protection Manager x64, and related white papers. These resources provide wiring diagrams, mounting instructions, and software compatibility details to support integration, configuration, and troubleshooting in industrial environments.
The product carries Eaton’s standard warranty policy: one year from installation or eighteen months from shipment, whichever occurs first. This coverage addresses manufacturing defects and provides a basis for service and replacement in the event of early failure or performance issues, subject to the policy terms.