Eaton NZMB2-A20-BT-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-A20-BT-NA
Quick Summary
The Eaton NZMB2-A20-BT-NA molded case circuit breaker protects distribution panels by providing dependable overcurrent protection for 440 Vac systems. Engineers often struggle with nuisance trips, space constraints, and difficult accessory compatibility; this unit addresses those challenges with a compact three-pole design and adjustable magnetic trip. Built on the NZM2 frame, it features fixed thermal and adjustable magnetic tripping (T185) and a robust 25 kAIC interrupt rating, supporting reliable protection in demanding environments. The warranty and manufacturer-compliance approach give procurement teams confidence during long deployments, while the front-frame clamp terminals and box connections simplify field installation. Together, these attributes translate to improved panel uptime, reduced maintenance, and streamlined replacement in distribution circuit protection applications.
Product Information
Extended Description
NZMB2-A20-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, 380-630A, Three-pole, 20A, 440 Vac, 25 kAIC, Box, Distribution circuit protect., 15-20A, Front frame clamp, 15-20A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-A20-BT-NA
EAN
4015081074204
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 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
20 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
350-350A delayed
Setting Range Ol Protector
15-20A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
15-20A
Number of poles
Three-pole
Trip rating
380-630 A
Power Xpert Protection Manager x64
Eaton Specification Sheet - NZMB2-A20-BT-NA
Intelligent power starts with accurate, actionable data
Feature → Business Impact → Application: The NZMB2-A20-BT-NA uses a three-pole NZM2 frame with front frame clamp terminals, delivering a tidy, secure connection at install time. This reduces wiring errors, speeds up panel assembly, and simplifies future maintenance. In distribution panels and motor control centers, the compact footprint helps fit dense layouts while maintaining safe clearance and thermal performance. Feature → Business Impact → Application: Amperage rating of 20 A with a 440 Vac supply and a 25 kAIC interrupt capacity supports typical plant loads and fault scenarios without nuisance tripping. The combination enables reliable protection for feeders, branch circuits, and machine controls, ensuring uptime in production environments. Feature → Business Impact → Application: The product provides an adjustable overload range of 15-20 A and a fixed setting for short-circuit release of 350 A delayed, enabling selective coordination with downstream devices. This reduces downstream outages while preserving fast fault clearance where needed in circuits feeding critical equipment. Feature → Business Impact → Application: Accessories including rocker lever and motor drive option simplify integration with motor control systems and panel doors. Front-frame clamp and box terminals offer straightforward field retrofits and validated compatibility across Eaton’s NZM2 family, minimizing spare-part inventories. Feature → Business Impact → Application: Built for distribution circuit protection with a footprint of 4.05 in depth, 7.24 in height, 4.13 in width and a weight of 4.1 lb, this unit fits typical enclosure footprints. The Eaton warranty policy provides post-sale support, helping maintenance teams justify lifecycle costs and optimize replacement intervals.
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FAQs
The NZMB2-A20-BT-NA uses front frame clamp terminals and a box connection scheme, designed to simplify wiring and improve pull-out stability. This reduces installation time, minimizes wiring errors, and eases future maintenance or retrofits within distribution panels and motor control centers.
The unit is rated for 20 A at 440 Vac and provides a 25 kAIC short-circuit breaking capacity. It employs fixed thermal with adjustable magnetic trip (T185), supporting selective coordination and fast fault clearance while protecting feeders and control circuits in industrial environments.
Yes. Its three-pole design, NZM2 frame, and front-frame clamp terminals are compatible with standard distribution panels and motor control centers. With a compact footprint and robust fault-current rating, it fits dense panel layouts while maintaining protection for motors and feeders in demanding industrial settings.
Compliances are defined by region and application. The product carries Eaton’s standard warranty (25-000) and requires confirmation from the manufacturer for specific regional certifications. Always verify local electrical standards and ensure compatibility with your enclosure and panel assembly requirements.
The unit offers reliable, long-term overcurrent protection with a 25 kAIC rating and 440 Vac operation, reducing unplanned downtime. The adjustable trip settings help prevent nuisance trips, while the front-frame and accessory options streamline installation and future upgrades, contributing to lower maintenance costs and longer service intervals.