Eaton NZMB2-M125 Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-M125
Quick Summary
The Eaton NZMB2-M125 Molded Case Circuit Breaker provides reliable overcurrent protection for industrial motor circuits. In real-world applications, engineers often confront mismatched trip curves and retrofit complexity that increase downtime. Certification considerations commonly include CE marking and UL/CSA recognition, along with IEC standards, with final approvals verified in the manufacturer datasheet. By combining adjustable thermal-magnetic protection with a compact NZM2 frame, this device delivers strong motor protection while simplifying panel integration and serviceability, enabling higher uptime and lower lifecycle costs across industrial applications.
Product Information
Extended Description
NZMB2-M125 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, 1280-2240A delayed, Three-pole, 160A, 600 Vac, 25 kAIC, Motor protection, 125-160A, Screw, 45 kW at 230 Vac, 90 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-M125
EAN
4015082657154
Product Length/Depth
8.5 in
Product Height
5.75 in
Product Width
3.75 in
Product Weight
5.46 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
160 A
Voltage rating
600 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Frame
NZM2
Class
Motor protection
Accessories
Rocker lever, motor drive
Setting Range Ol Protector
125-160A
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
Trip rating
1280-2240 A delayed
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB2-M125
Feature: Three-pole NZMB2 within the NZM2 frame delivers compact footprint and easy panel integration. Business Impact: Reduces enclosure size and wiring complexity, cutting installation time and saving cabinet space in control rooms and MCCs. Application: Ideal for motor-protection duties in harsh industrial environments where space is at a premium. Feature: Fixed thermal with adjustable magnetic trip (T185) and a setting range of 125–160 A. Business Impact: Enables precise coordination with motor loads and drives, minimizing nuisance trips while preserving equipment protection. Application: Conveyor lines, pumps, and fans where load profiles vary seasonally. Feature: Short-circuit breaking capacity of 25 kAIC and 25 kA interrupt rating. Business Impact: High fault withstand improves system reliability and reduces cascade effects during faults. Application: Heavy machinery and high inrush applications in manufacturing floors. Feature: Screw connection and included accessories (rocker lever, motor drive). Business Impact: Streamlines installation and commissioning, reduces field wiring errors, and enhances compatibility with standard control panels. Application: New builds and retrofit projects with common panel hardware. Feature: Rated operational current up to 90 kW at 400 Vac and 45 kW at 230 Vac; 160 A rating. Business Impact: Clear alignment with motor horsepower ranges and energy efficiency targets, supporting predictable protection and energy management. Application: Motors in process lines, packaging, and material handling.
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FAQs
The NZMB2-M125 uses screw-type connections and fits standard three-pole configurations within the NZM2 frame. It is designed for panel-mounted installations in industrial control panels and motor control centers, offering straightforward integration with common DIN rail and cabinet layouts. For best results, verify terminal torque specifications and enclosure clearances per the Eaton datasheet. Compatibility with motor drives and rocker-lever accessories ensures efficient commissioning and reliable operation in busy plant environments.
The T185 trip type provides fixed thermal protection with an adjustable magnetic trip, enabling selective coordination with motor loads. This reduces nuisance trips during normal inrush while still delivering fast response to short circuits. In practice, this means smoother motor startup, better panel reliability, and enhanced uptime in applications like pumps and conveyors where load fluctuations are common.
Yes. With a 160 A rating, 600 Vac voltage rating, and a 25 kAIC short-circuit rating, the NZMB2-M125 is designed for demanding industrial motor circuits. Its adjustable trip range (125–160 A) allows precise protection coordination for motors and drives, while the high interrupt capacity supports inrush events typical in fan, pump, and conveyor applications.
Certification considerations typically include CE marking and UL/CSA recognition, along with IEC-standard compliance for molded case circuit breakers. The exact approvals for NZMB2-M125 depend on the version and market origin, so always check the manufacturer datasheet or contact Eaton to confirm current certifications and installation compliance for your region.
Expected ROI stems from reduced downtime due to reliable protection, lower maintenance labor through straightforward screw-terminal installation and motor-drive compatibility, and improved protection coordination that minimizes equipment damage. By matching protection settings to motor loads (125–160 A) and leveraging a compact, high-capacity device, facilities typically see shorter commissioning times, fewer nuisance trips, and longer motor life.