Eaton NZMB2-A125 Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-A125
Quick Summary
The Eaton NZMB2-A125 molded case circuit breaker protects distribution panels with reliable overcurrent protection up to 125 A. Users often wrestle with nuisance trips or mismatched protection when selecting trip curves or frame types for multi‑phase systems. Certification considerations to verify include CE marking, IP ratings, and SIL safety level to meet global and safety standards. The NZMB2-A125 leverages the NZM2 frame, 600 Vac rating, and a 25 kAIC short‑circuit capability to support compliant, scalable distribution protection. In practice, this model translates to streamlined panel design, predictable maintenance, and lower total cost of ownership for industrial controls and motor circuits.
Product Information
Extended Description
NZMB2-A125 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, 750-1250A delayed, Three-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-A125
EAN
4015082590871
Product Length/Depth
5.9 in
Product Height
7.2 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
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
Three-pole
Trip rating
750-1250 A delayed
Feature → Business Impact → Application: The NZMB2-A125 uses a three‑pole configuration within the NZM2 frame, featuring fixed thermal and adjustable magnetic trip (T185) with a 100–125 A setting range. This delivers selective tripping for balanced multi‑phase loads, reducing downtime in complex distribution panels and enabling precise coordination with upstream protection schemes in manufacturing facilities. Application focus: distribution boards, control cabinets, and motor control centers where reliable overload protection is essential. Feature → Business Impact → Application: A 25 kAIC short‑circuit and interrupt rating provides robust fault protection, limiting downstream damage and enabling safer, more resilient power distribution in high‑demand environments. Application focus: heavy industry, processing lines, and large motor drives requiring stringent fault tolerance. Feature → Business Impact → Application: Adjustable trip characteristics (T185) and a 750–1250 A delayed trip range support inrush management and motor startup protection, improving equipment longevity and energy efficiency in automated lines. Application focus: conveyor systems, presses, and packaging equipment. Feature → Business Impact → Application: Front screw connection and compact physical footprint (5.9 in x 7.2 in x 4.1 in, 4.1 lb) simplify installation and cabinet packing density, reducing labor time and potential wiring errors during panel assembly. Application focus: new panel builds and retrofit projects where space and ease of installation matter. Feature → Business Impact → Application: Included accessories such as rocker lever and motor drive enhance ergonomics and control integration, improving operator interaction and remote control compatibility in machine automation. Application focus: control panels and machine interfaces seeking quick, accurate operation. The combination of these features supports higher reliability, faster commissioning, and lower lifecycle costs across industrial automation and electrical protection deployments.
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FAQs
The NZMB2-A125 uses a front screw connection and an NZM2 frame, designed for three‑pole installation in distribution panels. Verify a 100–125 A setting range, secure mounting on standard din rail or panel backing, and torque connections to the manufacturer’s specification. This setup streamlines wiring, improves fault isolation, and reduces commissioning time in new builds or retrofits.
Key specs include a 125 A amperage rating, 600 Vac voltage rating, and a short‑circuit breaking/interrupt rating of 25 kAIC. The trip type is T185 with a 100–125 A adjustable setting and a 750–1250 A delayed trip rating. These parameters support selective protection for multi‑phase loads and motor drives while maintaining safety margins.
Yes. The three‑pole NZMB2-A125, combined with the NZM2 frame, provides robust motor circuit protection, with a delayed trip range that accommodates motor inrush and startup conditions. Its 25 kAIC capability helps manage fault energy in high‑load environments, making it suitable for motor control centers and automated lines.
The product data specifies ‘Compliances: Contact Manufacturer,’ so confirmation of specific certifications should be obtained from Eaton. In practice, breakers of this class are commonly assessed for CE marking, UL/IEC compliance, and SIL/IP considerations depending on the installation, so verify applicable certifications with the supplier.
Warranty follows Eaton policy: one year from installation or 18 months from shipment, whichever occurs first. Benefit-wise, the device’s solid fault current rating and durable construction reduce downtime and repair costs, while the straightforward front‑screw installation can shorten commissioning and field maintenance.