Eaton NZMB2-AF20-BT-NA NZM Complete MCCB - 25 kAIC
Part Number: NZMB2-AF20-BT-NA
Quick Summary
The Eaton NZMB2-AF20-BT-NA is a molded case circuit breaker for reliable distribution protection in industrial panels. Engineers often struggle with coordinating thermal and magnetic trips across a three-pole device in compact spaces. Compliances are listed as contact manufacturer; verify regional certifications like CE or UL with Eaton to ensure site-specific approvals. With a robust 25 kAIC interrupt rating and a compact NZM2 frame, this unit provides scalable protection for 440 Vac systems, supporting efficient maintenance and reduced downtime. Its 20 A overload setting and optional rocker lever/motor drive simplify integration with existing automation cabinets and motor control centers.
Product Information
Extended Description
NZMB2-AF20-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adjustable magnetic trip, Three-pole, 20A, 440 Vac, 25 kAIC, Box, Distribution circuit protection, 20-20A, 350-350A delayed, Front frame clamp, 20-20A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF20-BT-NA
EAN
4015081072583
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
20-20A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
20-20A
Number of poles
Three-pole
Feature → Business Impact → Application: The NZMB2-AF20-BT-NA uses the NZM2 frame in a three-pole configuration with fixed thermal protection and an adjustable magnetic trip (T185). This combination delivers precise overload protection while accommodating inrush conditions typical of motor loads, reducing nuisance trips and improving overall uptime in distribution panels and machine control cabinets. Application-wise, it fits compact panel designs where reliable distribution circuit protection at 440 Vac is critical. Feature → Business Impact → Application: The unit offers a short-circuit breaking capacity of 25 kAIC and a 440 Vac rating, enabling safe interruption of high fault currents in industrial facilities. This translates to enhanced system safety, reduced equipment damage, and smoother maintenance cycles for main distribution boards and process line feeders. Feature → Business Impact → Application: Front frame clamp terminals simplify wiring and enable straightforward field installation or retrofits, minimizing commissioning time and minimizing the risk of connection faults during upgrades in existing panels. This is particularly advantageous for panel builders upgrading to higher fault protection without extensive rewiring. Feature → Business Impact → Application: Optional accessories, including rocker lever and motor drive, support easier manual operation or motorized control integration within automation cabinets, lowering maintenance effort and enabling remote or automated switching sequences in control rooms. Feature → Business Impact → Application: The 20-20A overload setting and clearly defined setting range provide precise coordination with downstream protection devices, enabling engineers to tune protection to motor starters and feeders. This reduces runaway trips in complex power distribution networks and supports compliant, auditable protection schemes in manufacturing environments.
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FAQs
The NZMB2-AF20-BT-NA is designed for the NZM2 frame and three-pole configurations in distribution panels and machine control cabinets. It uses front frame clamp terminals for quick wiring and is suited to 440 Vac systems with a 25 kAIC fault rating. Compatible accessories include a rocker lever and motor drive for enhanced operability in automation environments.
Installation benefits come from the front frame clamp terminals that simplify wiring and panel retrofits. The device fits within the NZM2 frame and utilizes a three-pole layout, making it straightforward to coordinate with upstream and downstream protection in existing distribution boards. Ensure correct seating and secure front-access connections during commissioning.
Yes. The NZMB2-AF20-BT-NA features a 25 kAIC short-circuit breaking capacity at 440 Vac, which supports high fault currents typical of industrial facilities. This capability helps protect upstream transformers and switchgear while maintaining system availability during fault events.
The unit offers fixed thermal protection with an adjustable magnetic trip (T185), a 20 A amperage rating, and a short-circuit rating of 25 kAIC. The overload range is specified as 20-20A, and the setting range for the short-circuit release is 350-350A delayed, enabling precise coordination with motor starters and feeders in panel assemblies.
Eaton provides a standard warranty per policy 25-000, which covers one year from installation or eighteen months from shipment, whichever occurs first. For regional certifications and compliance, confirm with the manufacturer to ensure the product meets your local UL/CE requirements and installation standards.