Eaton NZMB1-M100 NZM MCCB - 25 kAIC Short-Circuit Rating
Part Number: NZMB1-M100
Quick Summary
Eaton NZMB1-M100 is a molded case circuit breaker designed to protect motors and circuits in industrial control panels. Engineers often contend with nuisance trips and motor damage during startup; this model's thermomagnetic trip and phase-failure sensing help reduce unplanned downtime. Key capabilities include a 25 kAIC short-circuit rating, 440 Vac operation, and motor-protection class, while a 320-560 A trip range supports selective coordination for larger drives. Compliance specifics aren’t listed in the data; verify CE/UL/IEC applicability with Eaton as required for your facility. With a compact NZM1 frame and a 2.45 lb weight, it delivers reliable protection without heavy equipment changes.
Product Information
Extended Description
NZMB1-M100 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip, 320-560A, Three-pole, 100A, 440 Vac, 25 kAIC, Motor protect., Phase failure sensitive, thermomagnetic switch off, 32-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-M100
EAN
4015082657147
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
2.45 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
100 A
Voltage rating
440 Vac
Trip Type
T268
Circuit breaker type
NZMB1
Frame
NZM1
Class
Motor protection
Setting Range Ol Protector
32-40A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Rated operational current
18.5 kW at 400 Vac 11 kW at 230 Vac
Number of poles
Three-pole
Trip rating
320-560 A
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-M100
Feature → Business Impact → Application: Three-pole NZMB1 on the NZM1 frame provides robust, balanced protection across all three phases, enabling compact, modular panel designs and easier installation in existing controls. This supports improved reliability and easier maintenance in motor-driven applications such as conveyors and pumps. Feature → Business Impact → Application: A 25 kAIC short-circuit rating reduces the risk of cascading faults during high fault currents, lowering downtime and backup costs, especially in heavy motor-startups found in packagers and material handling. Feature → Business Impact → Application: The 32-40 A setting range enables selective coordination with motors, drives, and feeders, optimizing protection without unnecessary trips in automation panels. Feature → Business Impact → Application: Phase failure sensitivity detects single-phase loss, preventing partial protection failure and protecting motors from uneven loading in fans and conveyors. Feature → Business Impact → Application: Thermomagnetic trip provides fast, reliable overload and short-circuit protection, reducing wear on contacts and extending equipment life in fans, pumps, and machine tools. Feature → Business Impact → Application: 440 Vac operation aligns with common plant power distribution, simplifying integration with existing electrical infrastructure and standard MCCBs. Feature → Business Impact → Application: Compact dimensions and a light 2.45 lb weight simplify retrofit projects and new installations, enabling faster commissioning in control panels and OEM assemblies.
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FAQs
NZMB1-M100 is designed for Eaton’s NZM1 frame as a three-pole device. It should be mounted in compatible enclosures, observing the device footprint of 2.68 in depth, 5.71 in height, and 3.54 in width. The unit weighs about 2.45 lb, which eases handling during installation. Use the 32-40 A setting to tailor protection to the motor load and ensure secure terminal connections per the datasheet.
The product combines a motor-protection class with phase-failure sensitivity and a thermomagnetic trip, which together prevent nuisance trips and motor damage during startup. Its 100 A rating, 440 Vac capability, and 25 kAIC short-circuit rating support reliable protection for motors and drives in automation panels, conveyors, and pumps, with coordination options across a broad trip range.
Key specs include 100 A amperage rating, 440 Vac voltage rating, 25 kAIC interrupt capacity, 3-pole configuration, NZM1 frame, setting range 32-40 A, and a trip rating of 320-560 A. These figures determine protection level, fault clearance speed, and coordination with motor loads, enabling safe operation of three-phase motors in industrial environments.
The provided data notes compliance as 'Contact Manufacturer,' so CE/UL/IEC or other certifications should be confirmed with Eaton based on your facility requirements. In practice, verify that the device meets the standards applicable to your region and project, and request current certificates or declarations from Eaton to ensure regulatory alignment.
Expect low maintenance due to a thermomagnetic trip and phase-failure sensing that reduce nuisance trips. The unit’s durable design, motor protection class, and 25 kAIC rating contribute to longer motor life and fewer outages. Warranty is Eaton policy 25-000 (one year from installation or 18 months from shipment), providing a fixed baseline for service planning and total cost of ownership considerations.