Eaton NZMB2-S8-BT-CNA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-S8-BT-CNA
Quick Summary
The Eaton NZMB2-S8-BT-CNA Molded Case Circuit Breaker is a magnetic-trip, three-pole protection device designed for motor drives and industrial equipment. Engineers often confront nuisance trips or mismatched protection when loads vary; this unit provides an adjustable short-circuit release from 48 to 84 A and a magnetic-only trip to respond quickly to faults. Certification details are not specified in the data; consult Eaton for CE/UL/IEC conformance and integration guidance. Built on the NZM2 frame with front-frame clamp compatibility, it offers reliable protection in compact panel spaces. When paired with rocker lever and motor-drive accessories, it supports streamlined maintenance and improved system uptime for motor control centers.
Product Information
Extended Description
NZMB2-S8-BT-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, Three-pole, 8A, 440 Vac, 25 kAIC, Box, Motor protection without overload release, Rocker lever, motor drive, 48-84A delayed, Front frame clamp
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S8-BT-CNA
Model Code
NZMB2-S8-BT-CNA
EAN
4015081073207
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
8 A
Voltage rating
440 Vac
Trip Type
Magnetic only
Circuit breaker type
NZMB2
Terminals
Box
Frame
NZM2
Class
Motor protection without overload release
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
48-84A delayed
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Number of poles
Three-pole
Feature: Magnetic only trip with adjustable short-circuit release (48-84 A). Benefit: Delivers precise protection for motors with varying inrush, reducing nuisance trips and extending motor life. Application: Industrial motor drives and pump applications where starting currents fluctuate. Feature: NZM2 frame, three-pole, front-frame clamp terminals. Benefit: Seamless replacement in standard panels and quick, secure wiring for reliable operation. Application: Retrofit projects and new installations in control cabinets with common NZM2 footprints. Feature: 25 kAIC interrupt/breaking capacity. Benefit: Superior fault isolation in high-current scenarios, minimizing damage to downstream equipment. Application: Heavy-duty, three-phase motor systems in manufacturing lines. Feature: Accessories: rocker lever, motor drive compatibility. Benefit: Enhanced operator control and adaptable integration with motor drive assemblies. Application: Panel installations requiring accessible operation and drive-ready protection. Feature: Motor protection without overload release. Benefit: Targeted short-circuit protection when external overload devices are used, offering design flexibility. Application: Systems where separate overload protection is designated upstream.
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FAQs
Yes. The NZMB2-S8-BT-CNA is designed around the NZM2 frame and uses a front-frame clamp connection method, which aligns with common NZM2-compatible panels and simplifies installation and future maintenance. Ensure mounting space and terminal clearance meet the 4.13 in width, 7.24 in height, and 4.05 in depth specifications for proper fit.
The device features a magnetic-only trip type with a short-circuit breaking capacity of 25 kAIC, suitable for rapid fault clearance in three-phase motor circuits. It is rated for 440 Vac and supports an adjustable short-circuit release range of 48–84 A, enabling tailored protection for varying motor loads.
Yes, the NZMB2-S8-BT-CNA is compatible with motor-drive applications and includes or supports accessories such as a rocker lever and motor-drive options. This enhances operator control and simplifies integration into drive-ready panels, improving startup reliability and post-installation adjustability.
The provided data does not specify explicit certifications (such as CE, UL, or IEC). For compliance details, consult Eaton or the official specification sheet. Verifying certifications is essential when this device is deployed in regulated environments or across different regional markets.
Benefits include reduced downtime due to fast magnetic tripping and precise protection for motor loads, which lowers wear on downstream components. The front-frame clamp design simplifies installation and servicing, potentially reducing commissioning time and ongoing maintenance costs in motor control centers.