Eaton NZMB2-S18-BT-CNA Circuit Breaker - Magnetic
Part Number: NZMB2-S18-BT-CNA
Quick Summary
NZMB2-S18-BT-CNA is a reliable molded case circuit breaker designed for motor protection in industrial control panels. Engineers often struggle to balance a compact footprint with fast magnetic tripping and straightforward maintenance across demanding drive systems. While formal certifications should be confirmed with Eaton, this model provides a magnetic-only trip within an NZM2 frame, offering robust short-circuit protection up to 25 kAIC at 440 Vac. For reassurance, refer to Eaton’s specification materials and warranty terms as you validate compliance with uptime targets. The combination of a front-frame clamp, box terminals, and an ergonomic rocker lever supports quick field service, while the 18 A rating aligns with common motor starter protections in modern automation lines.
Product Information
Extended Description
NZMB2-S18-BT-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, Three-pole, 18A, 440 Vac, 25 kAIC, Box, Motor protection without overload release, Rocker lever, motor drive, 128-224A delayed, Front frame clamp
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S18-BT-CNA
Model Code
NZMB2-S18-BT-CNA
EAN
4015081073221
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
18 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
128-224A delayed
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Number of poles
Three-pole
Power Xpert Protection Manager x64
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB2-S18-BT-CNA
Intelligent power starts with accurate, actionable data
Feature → Magnetic-only trip on a three-pole NZMB2 within the NZM2 frame delivers fast, selective motor protection. Business Impact → Reduces motor damage and minimizes downtime by interrupting fault currents efficiently. Application → Ideal for motor drives in control panels where overload protection is provided externally. Feature → 18 A amperage rating and 440 Vac voltage rating. Business Impact → Enables safe operation for typical industrial motors without oversizing the protective device. Application → Suitable for standard motor starter circuits in automation lines. Feature → Short-circuit breaking capacity and interrupt rating at 25 kAIC. Business Impact → Enhances upstream fault tolerance, protecting downstream controllers and wiring from high fault currents. Application → Suitable for panels in high-inrush environments such as conveyors and pumps. Feature → Front frame clamp terminals. Business Impact → Facilitates easier installation and safer maintenance with front-access wiring. Application → Quick retrofit or new-panel assembly in tight spaces. Feature → Included accessories: rocker lever, motor drive. Business Impact → Improves operability and integration with motor drives, reducing commissioning time. Application → Controller panels and drive configurations requiring ergonomic operation. Feature → Motor protection without overload release. Business Impact → Enables coordination with external overload relays, expanding protection strategy while simplifying replacement cycles. Application → OEM and maintenance teams benefit from modular protection strategy in automation lines.
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FAQs
NZMB2-S18-BT-CNA is designed for front-frame mounting with box terminals, enabling safe, accessible wiring and quick servicing. Its 4.05 in depth, 7.24 in height, and 4.13 in width support compact panel layouts, while the front-frame clamp simplifies wiring during initial installation and future maintenance.
The magnetic-only trip provides fast, non-thermal interruption of fault currents, reducing stress on motor windings and drive electronics. In three-pole configurations, this ensures synchronized tripping across all phases, improving reliability in start-stop cycles and protecting driven equipment from short-circuit events.
Yes. The unit is described as motor protection without overload release, meaning you can coordinate with external overload relays to provide full motor protection. This approach allows you to tailor protection to motor temperature, load profile, and startup characteristics while keeping a compact protection scheme.
Formal certification details should be obtained from Eaton, as the product lists ‘Compliances: Contact Manufacturer.’ The device provides a 25 kAIC interrupt rating and 440 Vac operation, which align with common industrial safety standards once verified and documented by Eaton for your region.
The breaker’s compact NZM2 frame, ergonomic rocker lever, and front-frame wiring reduce installation time and service effort. Its robust 25 kAIC fault rating improves uptime in fault-prone lines, while the ability to pair with external overload protection helps optimize cost, spare parts, and maintenance scheduling for motor-driven applications.