Eaton NZMB2-S250-BT-CNA Complete MCCB - 25 kAIC
Part Number: NZMB2-S250-BT-CNA
Quick Summary
NZMB2-S250-BT-CNA molded case circuit breaker provides motor protection for industrial control panels. In demanding environments, installers struggle with reliable trip coordination and short-circuit protection. Certifications are to be confirmed with the manufacturer; common expectations include CE, UL, and IP-related ratings depending on installation and regional codes. This device uses the NZM2 frame with front-frame mounting and magnetic-only protection, delivering rugged performance for drive systems and heavy equipment. For procurement, its robust mechanical design, accessible accessories, and a one-year warranty support serviceability and total cost of ownership in electrical protection and motor-control projects.
Product Information
Extended Description
NZMB2-S250-BT-CNA Eaton: MCCB NZM, NZM2 Mag Only Breakers, Circuit Breaker, Frame clamp, front, Three-pole, 250A Perm. Current, 25 kA, 2000-2500A Undelayed Adj. Rng., Rocker lever, motor drive optional
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S250-BT-CNA
EAN
4015081073337
Product Length/Depth
5.51 in
Product Height
5.86 in
Product Width
5.86 in
Product Weight
5.17 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.
Certifications
Contact Manufacturer
Amperage Rating
250 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
2000-2500A delayed
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Number of poles
Three-pole
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB2-S250-BT-CNA
The NZMB2-S250-BT-CNA offers 250 A at 440 Vac with magnetic-only trip, built on the NZM2 frame and designed for front-frame clamp connections. This combination provides immediate, reliable short-circuit protection for high-current motors, reducing unplanned downtime and enabling safer panel operation. In panel applications such as motor control centers and drives, the compact footprint and three-pole configuration streamline installation, wiring, and maintenance. The device ships with a rocker lever and motor-drive compatibility, improving operator ergonomics and integration with drive systems. Its 25 kAIC interrupt rating supports heavy-duty fault currents, while the adjustable short-circuit release range (2000–2500 A, delayed) enhances coordination with upstream protection devices. The front-frame clamp terminals simplify servicing and replacement during routine maintenance, contributing to lower lifecycle costs. Warranty terms (one year from installation or 18 months from shipment) provide an additional layer of risk mitigation for OEMs and panel builders.
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FAQs
Install the NZMB2-S250-BT-CNA using the front-frame clamp terminals on the NZM2 frame. Verify three-pole wiring, secure the device to a standard panel cutout, and connect conductors per the engineering diagram. Ensure the device is mounted in a vertical orientation for optimal magnetic response and accessibility for maintenance, with the rocker lever in the accessible position.
The unit is rated for 250 A at 440 Vac with magnetic-only trip, intended for motor protection without an overload release. It provides a 25 kAIC short-circuit breaking capacity and an adjustable short-circuit release range of 2000–2500 A (delayed). It is a three-pole circuit breaker in the NZMB2 family with front-frame clamp terminals.
Yes. The product is designed for motor protection with magnetic-only trip and does not include an overload release. This makes it suitable for fast fault interruption in motor circuits where overload protection is provided elsewhere in the drive or control system, aligning with motor-control center practices.
Best suited for motor control centers, drive panels, and heavy machinery control in industrial settings. Its NZM2 frame, 3-pole arrangement, and front-frame mounting support dense panel layouts, while its high short-circuit rating and magnetic trip provide robust protection for high-current motors and feeders.
Warranty terms state one year from installation or eighteen months from shipment, whichever comes first. For certifications and specific regulatory compliance, consult the manufacturer’s datasheet or support team, as listed on the product page. Manufacturer support also covers installation guidance and compatibility inquiries about motor-drive integration.