Eaton NZMB1-A125-NA NZM MCCB - 3-pole 125A 480Vac 25 kAIC
Part Number: NZMB1-A125-NA
Quick Summary
The Eaton NZMB1-A125-NA is a complete molded case circuit breaker designed to protect distribution circuits in industrial power systems. Engineers often wrestle with nuisance trips, space constraints, and the need for reliable protection coordination across multiple feeders. This model offers a robust 125 A rating at 480 Vac with a 25 kAIC short‑circuit capacity, and it uses a three‑pole NZMB1 frame for compact installation. Note that listed certifications vary by market, and the Compliances field indicates 'Contact Manufacturer'—check the Eaton datasheet for CE, UL, or IEC approvals as required. In practice, using NZMB1-A125-NA improves uptime, simplifies panel layouts, and reduces spare-part complexity while delivering dependable protection aligned with modern automation architectures.
Product Information
Extended Description
NZMB1-A125-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip, 750-1250A delayed trip rating, Three-pole, 125A, 480 Vac, 25 kAIC, Distribution circuit protection, 100-125A, Front frame clamp, 100-125A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-A125-NA
EAN
4015082815622
Product Length/Depth
3.54 in
Product Height
3.32 in
Product Width
3.32 in
Product Weight
3 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
480 Vac
Trip Type
T268
Circuit breaker type
NZMB1
Frame
NZM1
Class
Distribution circuit protection
Accessories
Rocker lever
Setting Range Ol Protector
100-125A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
100-125A
Number of poles
Three-pole
Trip rating
750-1250 A delayed
125 A amperage rating at 480 Vac aligns with mid‑sized feeders in continuous production lines, delivering precise overcurrent protection without over-sizing panels. The thermal‑magnetic trip (T268) reacts quickly to faults while allowing normal startup surges; this reduces nuisance trips and improves line uptime. In industrial automation environments, the NZMB1-A125-NA supports reliable distribution circuit protection across multiple machines and zones. With a short‑circuit breaking capacity of 25 kAIC and an interrupt rating of 25 kAIC, the device withstands high fault currents typical of motor drives and heavy loads, enabling safer coordination with upstream devices. The 750–1250 A delayed trip rating provides staged protection for feeders connected to fluctuating loads, enabling safer coordination with upstream devices. Front frame clamp connection and the NZM1 frame geometry enable straightforward retrofits and quick field installation in compact panels. The three‑pole configuration keeps wiring tidy and supports balanced distribution protection across phases. The included rocker lever accessory enhances disconnection visibility and control during maintenance. Designed for reliable uptime, the NZMB1‑A125‑NA pairs with Eaton’s NZM1 family to offer consistent trip characteristics and predictable coordination. In practice, engineers appreciate the compact dimensions (3.54 in length, 3.32 in height and width) and a rugged 3 lb weight for easy handling and minimal panel intrusion. The warranty under Eaton policy supports long-term service planning and spare‑parts planning. From a procurement perspective, the NZMB1‑A125‑NA reduces part diversity and simplifies stocking with a single three‑pole MCCB for 125 A protection. The product’s front-frame mounting and standardized settings (100–125 A) help ensure fast commissioning and repeatable results across shift changes. For markets requiring specific approvals, refer to the Eaton specification sheet to verify CE, UL, or IEC certifications where applicable.
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FAQs
The NZMB1-A125-NA uses a front-frame clamp mounting approach within the NZM1 frame family, enabling straightforward retrofit in compact distribution panels. Its three-pole configuration aligns with standard 125 A feeders, simplifying wiring hierarchies and ensuring consistent trip characteristics with minimal panel intrusion. For best results, verify frame compatibility and mounting clearances in the Eaton NZM1 documentation and your panel specification.
Key specs include a 125 A amperage rating, 480 Vac voltage rating, and a short-circuit breaking capacity of 25 kAIC. It is a three-pole NZMB1 device with a T268 trip type and a setting range of 100–125 A for overload protection. The device uses a front-frame clamp connection and belongs to the NZM1 frame family, optimized for distribution circuit protection in industrial environments.
Yes. The NZMB1-A125-NA is designed for distribution circuit protection in industrial panels, offering a balanced three-pole configuration, reliable thermal-magnetic protection, and a robust 25 kAIC short-circuit rating suitable for motor loads and fluctuating processes. Its compact dimensions and front-frame mounting simplify installation in space-constrained automation enclosures.
Certifications are not listed in the provided data; refer to the Eaton specification sheet to verify market-specific approvals such as CE, UL, or IEC certifications. Compliance can vary by region, so review the official datasheet for your installation location and any regional electrical codes that apply to protection devices in industrial panels.
The product carries Eaton’s warranty policy, typically one year from installation or eighteen months from shipment, whichever occurs first. This supports long-term service planning and parts availability. For maintenance, rely on standard inspection intervals for molded case circuit breakers and refer to Eaton’s maintenance guidelines to ensure reliable operation and coordination with upstream protection.