Eaton NZMB2-A40-BT-NA Molded Case Circuit Breaker - 25 kAIC

Part Number: NZMB2-A40-BT-NA
Manufacturer
Eaton
Part number
NZMB2-A40-BT-NA

Quick Summary

NZMB2-A40-BT-NA Molded Case Circuit Breaker provides reliable overcurrent protection for distribution panels in industrial facilities. Engineers often contend with nuisance trips and limited installation space; this unit’s fixed thermal, adjustable magnetic trip lets you tailor protection without overdesign. Certification details are provided by the manufacturer, and compliance should be confirmed against Eaton’s datasheet for your region. With front-frame clamp terminals and options like rocker lever and motor drive, installation is straightforward and scalable for distribution panels. The combination supports faster commissioning, reduces wiring errors, and enhances system reliability across motor control centers and panel boards. In practice, you gain predictable protection aligned with 440 Vac networks and 25 kAIC fault levels.

Product Information

Extended Description

NZMB2-A40-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, 350-350A, Three-pole, 40A, 440 Vac, 25 kAIC, Box, Distribution circuit protect., 32-40A, Front frame clamp, 32-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-A40-BT-NA
EAN
4015081074235
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
5 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
40 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
Adjustment range short-circuit release
320-400A delayed
Setting Range Ol Protector
32-40A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
32-40A
Number of poles
Three-pole
Trip rating
350-350 A
Feature: 40 A rating with 25 kAIC interrupt capacity provides robust protection for feeders and downstream equipment. Business Impact: Reduces fault energy and unplanned downtime, improving overall line reliability in distribution panels. Application: Suitable for 40 A feeder branches in industrial power distribution networks. Feature: NZM2 frame compatibility and front-frame clamp terminals enable quick, secure mounting in compact enclosures. Business Impact: Faster commissioning and simpler maintenance, lowering installation labor costs. Application: Retrofit projects and new panel builds using box-terminals. Feature: Adjustable trip (T185) with an OL protector range of 32-40 A supports selective coordination. Business Impact: Minimizes nuisance trips and protects only the affected circuit, improving line uptime. Application: Panels with multiple feeders and motor loads requiring coordinated protection. Feature: Accessories such as rocker lever and motor drive expand control options. Business Impact: Enhanced operability and remote or automated control, reducing manual intervention. Application: Control panels and motor control centers needing easy local/manual overrides. Feature: Compact size and weight (4.05 in x 4.13 in x 7.24 in; 5 lb) streamline cabinet design and spare-part inventory. Business Impact: Lower space requirements and simplified logistics, accelerating installation in constrained environments. Application: New installations and upgrades in space-limited electrical rooms. Warranty and support: Standard Eaton policy provides coverage from installation or shipment date, supporting long-term ownership costs. Application: Asset management and total cost of ownership (TCO) considerations in distributed protection schemes.

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FAQs

Install the NZMB2-A40-BT-NA using the front-frame clamp terminals aligned with the NZM2 frame mounting pattern. Ensure the device is securely seated, connectors are clean, and the expected 40 A operating range corresponds to the panel ratings. Use the rocker lever or motor drive accessories as needed for operational control. Verify torque and clearance according to Eaton installation guidelines to maintain optimal performance and safety.
Key specs include 40 A amperage rating, 440 Vac voltage rating, and 25 kAIC short-circuit breaking capacity with a three-pole configuration. The trip type is T185, and the device uses front-frame clamp terminals on the NZM2 frame. The setting range for overload protection is 32-40 A, with a 320-400 A delayed short-circuit release, suitable for distribution circuits in industrial environments.
Yes. Its NZM2 frame, 40 A rating, 3-pole design, and 25 kAIC interrupt capability make it appropriate for distribution panels and motor control centers where reliable protection and selective tripping are important. The front-frame clamp and available accessories simplify integration into MCCs and panel boards, supporting scalable protection across multiple feeders.
Compliance details are not listed in the provided data. Please consult Eaton’s official specification sheets for CE, UL, IP, and region-specific ratings. The Eaton NZMB2-A40-BT-NA datasheet and installation guides provide the authoritative certification information and regional acceptance criteria needed for regulatory compliance.
Warranty terms follow Eaton Selling Policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This warranty supports protection device integrity and practical ownership costs, with Eaton providing product support and documentation through its channel partners for installation guidance and field service as needed.