Eaton NZMB1-M40 Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-M40
Quick Summary
NZMB1-M40 molded case circuit breaker protects motors and electrical circuits in industrial control panels. It minimizes nuisance trips and motor damage by combining phase failure sensing with a thermomagnetic trip for variable loads. Certification status is listed as 'Compliances: Contact Manufacturer'; verify CE, IP ratings, and SIL compatibility in the official Eaton datasheet to ensure regulatory alignment. This device is built on the NZM1 frame and delivers motor protection in 440 Vac systems, with a 40 A rating and 25 kAIC fault capacity, supporting reliable protection and improved uptime for automated processes and line equipment.
Product Information
Extended Description
NZMB1-M40 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip, 640-1120A, Three-pole, 40A, 440 Vac, 25 kAIC, Motor protect., Phase failure sensitive, thermomagnetic switch off, 63-80A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-M40
EAN
4015082657109
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
2.37 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
Phase failure sensitive, thermomagnetic switch off
Amperage Rating
40 A
Voltage rating
440 Vac
Trip Type
T268
Circuit breaker type
NZMB1
Frame
NZM1
Class
Motor protection
Setting Range Ol Protector
63-80A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Rated operational current
45 kW at 400 Vac 22 kW at 230 Vac
Number of poles
Three-pole
Trip rating
640-1120 A
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-M40
Three-pole NZMB1-M40 delivers robust protection for motor loads while occupying a compact footprint, enabling streamlined control panel design and safer starting sequences. Business impact: safer motor startup, reduced wear on contacts, and predictable maintenance intervals; Application: fault-told environments with conveyors, pumps, and fans where space is at a premium. Phase failure sensing detects loss of any phase, preventing single-phase operation that can overheat motors and cause premature failure. Business impact: lower downtime and extended motor life; Application: varying loads in manufacturing lines and HVAC systems. Thermomagnetic trip provides fast response to overcurrent and short-circuit events, protecting wiring and downstream devices. Business impact: minimized energy waste and reduced cascading outages; Application: critical drives and feeder circuits. Short-circuit breaking capacity of 25 kAIC adds resilience to high-fault environments, ensuring panel safety and equipment integrity. Business impact: improved safety margins and easier panel planning; Application: switchgear assemblies and machine control panels. Setting range Ol Protector 63-80A allows tailoring to specific motor currents, aligning protection with actual running current. Business impact: optimized protection without nuisance trips; Application: variable-speed drives and motors. NZM1 frame compatibility ensures straightforward installation in existing enclosures, reducing retrofit costs. Warranty terms provide policy-backed protection for project timelines and field service.
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FAQs
The NZMB1-M40 is ideal for motor protection in three-pole, 440 Vac control panels across industrial environments such as conveyors, pumps, and HVAC systems. Its 40 A rating supports mid-range motor circuits, while the 25 kAIC short-circuit rating provides a robust safety margin for panel boards and starter assemblies. The device fits standard NZM1 frame enclosures, enabling straightforward integration into existing panel schedules.
Phase failure sensing detects loss of any single phase, preventing motors from running on two phases and overheating. The thermomagnetic trip adds fast protection against overcurrent and short circuits. Together, they reduce nuisance trips, minimize motor wear, and shorten downtime, delivering more reliable operation in dynamic loads typical of manufacturing lines and material handling.
Yes, the NZMB1-M40 uses the NZM1 frame and is designed for three-pole installation with compact dimensions (2.68 in depth, 5.71 in height, 3.54 in width). This compatibility simplifies retrofits and new builds alike, allowing easy mounting in existing enclosures and reducing panel rework. The 63-80 A setting range enables tailored protection to match actual running currents.
Key ratings include 40 A amperage, 440 Vac voltage, and a short-circuit breaking capacity of 25 kAIC with a 3-pole configuration. The trip type is T268, and the trip rating range is 640-1120 A. These specs support motor protection, safe disconnection during faults, and reliable operation in demanding industrial applications.
Warranty follows Eaton policy 25-000: one year from installation or eighteen months from shipment, whichever comes first. Maintenance should focus on regular inspection of connections and mechanical operation, with replacement of worn parts as recommended in Eaton datasheets. For regulatory compliance and region-specific certifications, consult the official datasheet and Eaton support to confirm CE, IP, or SIL alignment.