Eaton NZMB2-4-A125 NZM MCCB - 25 kAIC
Part Number: NZMB2-4-A125
Quick Summary
NZMB2-4-A125 is an Eaton NZM complete molded case circuit breaker for distribution protection in industrial panels. For engineers, selecting the correct protection and trip coordination can be challenging, especially in high-current panels where space and wiring complexity matter. The NZMB2-4-A125 delivers adjustable magnetic trip (T185), front screw terminals, and a four-pole configuration, helping you tune protection precisely while simplifying installation. Specific standards vary by region; please verify certifications such as CE, SIL, or IP ratings with Eaton to ensure regulatory compliance in your market. By standardizing on the NZM2 frame with this unit, maintenance is streamlined, stock is reduced, and system uptime is maximized, delivering reliable, scalable protection for distribution circuits in industrial environments. Secondary keywords include molded case circuit breaker, distribution circuit protection, and 600 Vac suitability.
Product Information
Extended Description
NZMB2-4-A125 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, 750-1250A delayed, Four-pole, 125A, 600 Vac, 25 kAIC, Distribution circuit protection, 100-125A, Front screw, 100-125A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-4-A125
EAN
4015082658472
Product Length/Depth
5.51 in
Product Height
5.86 in
Product Width
5.86 in
Product Weight
5.17 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
600 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Setting Range Ol Protector
100-125A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front screw
Overload range
100-125A
Number of poles
Four-pole
Trip rating
750-1250 A delayed
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB2-4-A125
Implementation of arc flash mitigating solutions at industrial manufacturing facilities
125 A rating, 600 Vac, 25 kAIC, four-pole, front-screw connection form the core specification set of the NZMB2-4-A125. This combination provides robust distribution circuit protection with fast interruption under short-circuit events, while its compact footprint eases panel layout and wiring. Ideal applications include industrial distribution panels, motor control centers, and switchgear assemblies where dependable protection and straightforward maintenance matter. The adjustable magnetic trip (T185) with a 100–125 A setting range delivers precise coordination with downstream devices, reducing nuisance trips and downtime during varying load transients. Four-pole construction ensures balanced protection across all three phases and neutral in 4-wire systems, simplifying wiring and enhancing safety in complex electrical networks. Front screw terminals enable straightforward field wiring and quick maintenance access, while accessories like rocker lever and motor drive support streamline operation. A 25 kAIC interrupt rating reinforces reliability in high-energy circuits, helping meet common distribution protection standards and enabling smoother regulatory alignment. Compatibility with the NZM2 frame supports consistent panel design, easier stocking, and faster replacement cycles, contributing to lower maintenance costs and improved uptime in manufacturing environments.
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FAQs
The NZMB2-4-A125 is designed for the NZM2 frame with four-pole construction and front-screw terminals. For installation, ensure compatible mounting within standard 4-pole enclosure spaces, verify terminal clearances, and follow Eaton guidance for wiring sequences. The unit supports straightforward field wiring and rapid replacement to minimize panel downtime.
Key ratings include a 125 A amperage rating, 600 Vac maximum voltage, and 25 kAIC short-circuit breaking capacity. The trip type is T185, with a setting range of 100–125 A. These settings enable precise coordination with downstream protection and help prevent nuisance trips during normal operation.
This product is suited for distribution panels, motor control centers, and switchgear assemblies in industrial facilities. Its four-pole design accommodates 3-phase systems with neutral, while the 600 Vac rating supports typical plant-level power distribution networks.
Certification details can vary by market. Eaton provides compliance information per region; buyers should verify CE, SIL, IP ratings, and other regional approvals with Eaton to ensure the product meets local regulatory requirements and safety standards.
The device offers reliable protection with precise trip coordination, reducing unexpected outages. Its modular NZM2 frame compatibility simplifies stocking and replacement, lowering maintenance time and costs. Standardized protection across panels also supports faster commissioning and improved overall equipment effectiveness (OEE) in production environments.