Eaton NZMB2-S125-BT-CNA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-S125-BT-CNA
Quick Summary
The Eaton NZMB2-S125-BT-CNA is a molded case circuit breaker designed for motor protection in industrial control panels. Engineers often struggle to balance surge handling with space constraints when protecting large motors in compact housings. Compliance details are provided by the manufacturer; check the Eaton datasheet for applicable marks and certifications. With a 125 A rating, 440 VAC operation, and a 25 kAIC interrupt capacity, this unit supports reliable protection, reduced downtime, and straightforward installation in NZM2-frame assemblies for control panels and dedicated motor-drive applications.
Product Information
Extended Description
NZMB2-S125-BT-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, 1000-1750A delayed trip rating, Three-pole, 125A, 440 Vac, 25 kAIC, Box, Motor protection without overload release, Front frame clamp
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S125-BT-CNA
EAN
4015081073306
Product Length/Depth
5.9 in
Product Height
7.7 in
Product Width
4.1 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
125 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
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Number of poles
Three-pole
Trip rating
1000-1750 A delayed
Eaton Specification Sheet - NZMB2-S125-BT-CNA
Selling Policy 25-000 - Distribution and Control Products and Services
Feature: Magnetic-only trip provides fast, reliable interruption during overload and short-circuit events. Business Impact: reduces motor damage and unexpected downtime while simplifying protective coordination. Application: ideal for motors that require magnetic protection without overload release in compact control panels. The NZMB2-S125-BT-CNA delivers precision protection in 3-phase systems, enabling predictable startup behavior and enhanced equipment longevity. Feature: 125 A amperage rating with 440 Vac operating voltage and 25 kAIC short-circuit rating. Business Impact: supports robust short-circuit containment and safe disconnection of high-inrush loads, lowering damage risk and maintenance costs. Application: suitable for medium-size industrial motors and downstream loads in manufacturing lines and material-handling equipment. Feature: NZM2 frame compatibility, front frame clamp terminals, and box connections. Business Impact: facilitates effortless panel integration, faster installation, and reliable electrical integrity. Application: well-suited for new builds and retrofit projects in machine control panels where space and accessibility matter. Feature: Accessories including rocker lever and motor drive option. Business Impact: improves operator control and offers flexible integration with motor drives and control schemes. Application: makes field adjustments and commissioning straightforward in automation environments. Feature: Delayed trip rating from 1000 to 1750 A. Business Impact: accommodates motor surge profiles during startup, protecting circuits while preventing nuisance trips. Application: particularly beneficial for high-inertia loads and conveyor systems in dynamic manufacturing lines. Note: The product description references a front-frame clamp connection and motor-protection-without-overload-release classification, aligning with common motor-protection strategies in industrial automation.
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FAQs
NZMB2-S125-BT-CNA uses front-frame clamp terminals and box connections, enabling quick, secure mounting in NZM2-frame enclosures. This design simplifies wiring and reduces installation time, while maintaining reliable isolation for three-pole, 125 A circuits. For retrofits, verify enclosure compatibility and ensure clear access for maintenance and testing.
The device provides a 125 A amperage rating at 440 Vac with magnetic-only trip protection, and a short-circuit current rating of 25 kAIC. The delayed-trip option ranges 1000–1750 A to accommodate motor start-up transients. These ratings support reliable motor protection in three-phase loads while minimizing nuisance trips during startup.
Yes. With a motor-protection-without-overload-release class and a magnetic-only trip, this breaker is well suited for automation equipment, conveyors, pumps, and other three-phase motors. Its 125 A rating, 440 Vac limit, and 25 kAIC interrupt capacity provide robust protection in panel-mounted control systems while enabling straightforward integration with motor drives.
Compliance details in the provided data indicate a 'Contact Manufacturer' status. For formal certifications such as CE or UL, consult the Eaton specification sheet linked in the product data to confirm current marks and listings applicable to your region and application before procurement or installation.
Warranty aligns with Eaton policy SP 25-000, offering one year from installation or eighteen months from shipment, whichever occurs first. This coverage supports reduced total cost of ownership by protecting against early defects, while the rugged front-frame mounting and reliable magnetic protection help minimize maintenance downtime in production environments.