Eaton NZMB2-S125-CNA Molded Case Circuit Breaker - 25 kAIC Magnetic Trip
Part Number: NZMB2-S125-CNA
Quick Summary
The Eaton NZMB2-S125-CNA molded case circuit breaker provides reliable motor protection for industrial control panels. Engineers often struggle to choose devices that withstand start-up surges and deliver fast, predictable trips without nuisance shutdowns. This model features magnetic-only operation with a 25 kAIC interrupt rating and fits the NZM2 frame, offering robust protection while supporting regional compliance through the manufacturer. In practice, it helps reduce downtime, simplifies retrofit projects, and integrates with common motor-control architectures using a compact, screw-terminal footprint for dependable panel installation.
Product Information
Extended Description
NZMB2-S125-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, 84-144A delayed, Three-pole, 12A, 440 Vac, 25 kAIC, Motor protection without overload release, Screw, 3 kW at 230 Vac, 5.5 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S125-CNA
EAN
4015082692483
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
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
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Screw
Rated operational current
5.5 kW at 400 Vac 3 kW at 230 Vac
Number of poles
Three-pole
Trip rating
84-144 A delayed
Feature: Magnetic-only trip, 12 A rating, 440 Vac. Business Impact: Fast, secure fault interruption minimizes motor damage and panel downtime, improving machine uptime in dynamic production lines. Application: Ideal for motor drives and three-phase loads in manufacturing environments. Feature: NZM2 frame compatibility, three-pole design. Business Impact: Easy integration into existing NZM2-based control panels and standardized assemblies, reducing retrofit time and wiring complexity. Application: New installations or upgrades in compact control cabinets. Feature: Screw terminations. Business Impact: Secure, vibration-resistant connections that lower field maintenance and contact resistance over time. Application: Industrial panel assembly subject to mechanical stress. Feature: 25 kAIC interrupt rating. Business Impact: High fault withstand capability supports short-circuit protection for medium-power motors, reducing asset risk. Application: Protective device selection for machines with high inrush. Feature: 84-144 A delayed trip with motor protection without overload release. Business Impact: Controls motor start-up inrush while preserving prevention of overload trips, lowering mis-operation in dynamic loads. Application: Start-up-laden equipment like conveyors and pumps. Feature: 5.5 kW at 400 Vac and 3 kW at 230 Vac. Business Impact: Supports a range of motor sizes without oversizing, optimizing energy use and panel footprint. Application: Medium-power motor applications in packaging, processing, and machine tools.
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FAQs
Yes. The NZMB2-S125-CNA is designed for the NZM2 frame and uses standard screw terminations for secure panel mounting. It is a three-pole magnetic-only breaker with a compact footprint (5.9 in L × 7.7 in H × 4.1 in W) and weighs about 4.1 lb, making Retrofit and installation straightforward in existing NZM2-based panels.
Key specs include a 12 A rated current, 440 Vac voltage rating, magnetic-only trip, and 25 kAIC short-circuit capacity. It is a three-pole device in the NZMB2 family (NZM2 frame) with secure screw connections and a rated operational power range of 3 kW at 230 V and 5.5 kW at 400 V.
Ideal for motor control panels and drives in manufacturing lines, it provides fast magnetic protection for motors during startup, reducing nuisance trips. It supports 5.5 kW at 400 V and 3 kW at 230 V, enabling compact, efficient protection for medium-power motor loads in machine tools, conveyors, and pumps.
The breaker is covered under Eaton policy 25-000, offering one year from installation or eighteen months from shipment, whichever comes first. Compliance details vary by region; consult Eaton for CE, UL, or other approvals and ensure the device meets your local electrical standards.
Use the secure screw-terminals and, where applicable, add the rocker lever or motor-drive accessories to optimize mounting and operation. Ensure proper torque on connections, install in a ventilated enclosure, and verify panel accessibility for maintenance. The magnetic-only trip reduces wear, supporting long-term reliability in dynamic motor applications.