Eaton NZMB2-AF125-BT-NA NZM complete molded case circuit breaker - 25 kAIC
Part Number: NZMB2-AF125-BT-NA
Quick Summary
NZMB2-AF125-BT-NA is a rugged molded case circuit breaker designed to protect distribution circuits in industrial panels. This model helps reduce nuisance trips and simplifies panel layouts by combining a fixed thermal and adjustable magnetic trip in a compact NZM2 frame. In line with global practice, electrical protection devices in this class commonly support CE/UL-style compliance and robust enclosure concepts, with region-specific approvals confirmed by Eaton. For electrical engineers and maintenance teams, the 125 A rating paired with a 25 kAIC short-circuit rating delivers reliable protection of motors and feeders while enabling straightforward commissioning and lifecycle cost reductions. The device integrates front-frame clamp terminals for quick wiring in space-constrained installations, supporting faster, safer field work.
Product Information
Extended Description
NZMB2-AF125-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, 750-1250A delayed, Three-pole, 125A, 440 Vac, 25 kAIC, Box, Distribution circuit protection, 125-125A, Front frame clamp, 125-125A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF125-BT-NA
EAN
4015081072910
Product Length/Depth
8.5 in
Product Height
5.75 in
Product Width
3.75 in
Product Weight
5.46 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
440 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Terminals
Box
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Setting Range Ol Protector
125-125A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
125-125A
Number of poles
Three-pole
Trip rating
750-1250 A delayed
Feature: NZM2 frame and complete molded case construction provide robust protection in a compact footprint. Business Impact: Reduces panel size and improves reliability under fault conditions, lowering downtime and maintenance costs. Application: Distribution circuit protection in MCCs and switchgear where space is at a premium. Feature: Fixed thermal, adjustable magnetic trip (T185) with a setting range of 125-125 A. Business Impact: Precise coordination with upstream devices and reduced nuisance trips, optimizing machine uptime and energy use. Application: Motors and feeders requiring tailored fault response in industrial panels. Feature: 125 A amperage rating and 440 VAC operating voltage with a 25 kAIC short-circuit rating. Business Impact: Suitable for common industrial feeders and high fault current environments, ensuring fast, reliable interruption. Application: Panel feeders and distribution circuits in manufacturing lines. Feature: Front frame clamp terminals for secure, quick connections. Business Impact: Speeds installation and minimizes wiring errors, improving site productivity and safety. Application: Retrofit projects and new builds where accessible front-frame mounting is advantageous. Feature: Accessories including rocker lever and motor drive support. Business Impact: Enhanced operability and integration with motor control schemes, reducing manual handling and control wiring. Application: Machine wiring and control panel assemblies. Feature: 3-pole configuration with a distribution-class rating and 125-125 A overload protection. Business Impact: Clear protection topology for multi-phase systems, enabling consistent coordination and simplified maintenance. Application: Three-phase distribution circuits in industrial plants.
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FAQs
Use the front-frame clamp terminals for secure, space-efficient connections in panel doors or recessed enclosures. Ensure adequate clearance for wiring and tighten to supplier-recommended torque values. The design supports quick wiring changes, simplifies maintenance, and reduces installer time in confined spaces.
Key specs include a 125 A amperage rating, 440 VAC operating voltage, and a 25 kAIC short-circuit breaking capacity. It is a three-pole NZMB2 unit with a fixed thermal and adjustable magnetic trip (T185), and a setting range of 125-125 A for precise protection coordination.
Yes. The three-pole NZM2 frame, 125 A rating, and 25 kAIC capacity enable reliable protection in motor control centers and distribution panels. The available accessories (rocker lever, motor drive) support motor-starting coordination and operator convenience in MCC environments.
Compliance details should be confirmed with Eaton for your region. Devices in this class are typically aligned with IEC 60947-2 family standards and region-specific listings (for example CE or UL). Always verify the exact certifications required for your installation site.
The NZMB2-AF125-BT-NA provides predictable trip performance, reducing unplanned outages and enabling faster commissioning. The warranty terms (one year from installation or 18 months from shipment) offer protection during early life, contributing to lower lifecycle costs when paired with efficient installation via front-frame clamps.