Eaton NZMB1-S12-CNA NZM Complete MCCB - Magnetic-only Trip
Part Number: NZMB1-S12-CNA
Quick Summary
NZMB1-S12-CNA is a magnetic-only trip molded case circuit breaker designed for motor protection in industrial equipment. Shop-floor teams often struggle with replacements that fit existing panels and minimize downtime. Compliances for this class typically include CE marking and IEC alignment, with final certification verified by Eaton. Leveraging the NZM1 frame and compact footprint delivers reliable protection in tight spaces, preserving panel coherence while reducing wiring complexity. With 12 A at 480 VAC and a 25 kAIC short-circuit rating, it supports efficient motor control without overload release. Its magnetic switch-off feature further simplifies safe shutdowns, making it well suited for high-demand automation environments.
Product Information
Extended Description
NZMB1-S12-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Magnetic only trip, 126-216A, Three-pole, 12A, 480 Vac, 25 kAIC, Motor protection without overload release, Magnetic switch off, 4 kW at 230 Vac, 7.5 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-S12-CNA
EAN
4015081028603
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
3 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
Special features
Magnetic switch off
Amperage Rating
12 A
Voltage rating
480 Vac
Trip Type
Magnetic only
Circuit breaker type
NZMB1
Frame
NZM1
Class
Motor protection without overload release
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Rated operational current
7.5 kW at 400 Vac 4 kW at 230 Vac
Number of poles
Three-pole
Trip rating
126-216 A
Eaton Specification Sheet - NZMB1-S12-CNA
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Magnetic-only trip provides instant disconnection on short circuits, reducing fault energy and protecting motors. Business Impact: Minimizes downtime and arc exposure, improving machine availability. Application: Conveyor lines, pumps, and fans elect to prevent cascading faults. The NZM1 frame compatibility ensures predictable installation in existing panels. Feature: Three-pole design and 12 A rating deliver balanced protection across all phases. Business Impact: Simplifies panel wiring, enhances coordination with upstream protections, and supports scalable protection across small to medium motors. Application: Skid-mounted equipment and compact automation racks. Feature: 480 VAC operation with 25 kAIC interrupt capacity offers robust fault handling. Business Impact: Reduces the need for downstream coordination and increases fault clearance reliability. Application: Medium-voltage motor circuits and plant-wide motor control centers. Feature: Motor protection without overload release focuses protection on short-circuit events. Business Impact: Limits mechanical stress and reduces nuisance trips during startup surges. Application: Motor starters, drives, and PTO-driven equipment. Feature: Compact NZM1 frame and 3 lb weight enable easier retrofit and panel maintenance. Business Impact: Lowers installation time and adds mounting flexibility. Application: Retrofit projects and space-constrained control panels. Feature: Magnetic switch-off provides rapid, deliberate shutdown capability. Business Impact: Improves safety during maintenance and emergency stops. Application: All motor-driven processes where quick disconnection is critical.
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FAQs
Yes. The NZMB1-S12-CNA is specified for the NZM1 frame and three-pole configurations, ensuring consistent mounting and electrical fit within standard NZM1 panel cutouts. Follow Eaton installation guidelines for wiring polarity and terminal torque to optimize protection and minimize downtime.
The device provides a 25 kAIC short-circuit breaking capacity and operates at 480 VAC. It is rated for 12 A and supports magnetic-only tripping to quickly isolate faults without an overload release, suitable for motor circuits up to 7.5 kW at 400 VAC and 4 kW at 230 VAC.
This three-pole, magnetic-only MCCB is designed for motor protection in automation lines, conveyors, pumps, and fans. It protects motors against short circuits while not providing overload protection, so it is most effective when combined with appropriate overload protection in the system design, per motor and drive requirements.
Compliances are listed as ‘Contact Manufacturer’ for this model. Typical industry practice for similar products includes regulatory alignment such as CE marking and IEC standards, but final certification should be confirmed with Eaton to ensure project-specific approvals.
Eaton’s warranty policy for this product is one year from installation or eighteen months from shipment, whichever occurs first, under Selling Policy 25-000. This supports maintenance planning and supports ROI through predictable replacement cycles and documented service terms.