Eaton NZMB2-S12-CNA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-S12-CNA
Quick Summary
NZMB2-S12-CNA is a molded case circuit breaker for motor protection in industrial electrical panels. Engineers often face the challenge of protecting motors from faults while keeping panel space and installation costs under control. This model meets rugged industrial requirements with a magnetic-only trip and a 25 kAIC short-circuit rating, built on the NZM2 frame for scalable motor control. The product supports 440 Vac systems across three poles and up to 90 kW at 400 Vac, with a 12 A rating. Compliance is defined by the manufacturer, with a standard one-year warranty; verify any CE, UL, or IP requirements for your installation. In practice, it enables compact, robust protection that integrates with rocker lever and motor drive accessories for streamlined installation and uptime.
Product Information
Extended Description
NZMB2-S12-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, Three-pole, 12A, 440 Vac, 25 kAIC, Motor protection without overload release, 1280-2240A delayed, Screw, 45 kW at 230 Vac, 90 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S12-CNA
EAN
4015081028757
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
Frame
NZM2
Class
Motor protection without overload release
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
1280-2240A delayed
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Screw
Rated operational current
90 kW at 400 Vac 45 kW at 230 Vac
Number of poles
Three-pole
Eaton Specification Sheet - NZMB2-S12-CNA
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: Magnetic-only trip provides fast fault interruption, reducing motor damage and downstream downtime in high-energy startup environments. This translates to improved machine availability and lower maintenance costs for OEM panels and distributed drives. Application: Motor control centers and panel boards in manufacturing lines requiring reliable short-circuit protection without overload release. Feature → Business Impact → Application: NZMB2 frame (NZM2) ensures seamless compatibility with existing Eaton NZM2 devices, enabling straightforward retrofits and standardized maintenance. Application: Upgrading legacy protection schemes in multi-motor systems with consistent protection coordination. Feature → Business Impact → Application: 25 kAIC interrupt rating supports fault currents typical in industrial facilities, improving protection margins and compliance with plant-wide safety standards. Application: Main feeders in motor-driven equipment and infeed protection for critical loads. Feature → Business Impact → Application: Screw termination simplifies field wiring and reduces installation time, lowering labor costs. Application: New installations and panel renewals where quick, secure connections matter. Feature → Business Impact → Application: Adjustable short-circuit release (1280-2240A delayed) enables tailored coordination with upstream protection, reducing nuisance trips and optimizing selectivity. Application: Custom motor protection schemes for diverse load profiles. Feature → Business Impact → Application: Accessories like rocker lever and motor drive enhance usability and maintenance, improving reliability and operator ergonomics. Application: On-site commissioning and routine operation in demanding environments.
Get a Quick Quote for a Eaton NZMB2-S12-CNA
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton NZMB2-S12-CNA?
Enquire Now
FAQs
NZMB2-S12-CNA uses screw termination for secure field wiring in a three-pole configuration. Its compact 4.05 in depth, 4.13 in width, and 7.24 in height fit standard electrical panels, and its 4.1 lb weight facilitates ease of handling during panel assembly or retrofit projects.
The device provides a 12 A rated current, 440 Vac voltage rating, and a magnetic-only trip with a 25 kAIC short-circuit breaking capacity. It is a three-pole NZMB2 unit built on the NZM2 frame, designed for rapid interruption of motor faults without overload release.
Yes. It supports up to 400 V class motor protection with rated operational power of 90 kW at 400 Vac and 45 kW at 230 Vac. Its magnetic trip is well suited for high-inrush motor starts, delivering reliable safeguards for industrial drives and conveyors.
Eaton provides a warranty under Selling Policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. Compliances are listed as ‘Contact Manufacturer’; verify regional certifications such as CE, UL, or IP ratings with Eaton for your market requirements.
Accessories include a rocker lever and motor drive to streamline operation and mounting. The NZMB2 unit is designed to be compatible with the NZM2 frame, enabling straightforward integration with existing Eaton protection schemes and simplifying upgrades in multi-motor installations.