Eaton NZMB1-S3-CNA Molded Case Breaker - 25 kAIC
Part Number: NZMB1-S3-CNA
Quick Summary
Eaton NZMB1-S3-CNA is a complete molded case circuit breaker for motor protection in industrial control panels. Many users struggle with reliable high-current protection during motor starts and rapid fault isolation. Note that regional certifications such as CE, UL, or IP ratings depend on local approvals and should be confirmed with Eaton. In practice, this magnetic-only trip unit, NZM1 frame, and 320–560 A range deliver quick fault clearance while keeping die-cast housing compact. From a business perspective, you gain uptime, predictable replacement cycles, and cost-efficient maintenance when matched to the NZM1 family lineup, with strong protection without overload releases.
Product Information
Extended Description
NZMB1-S3-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Magnetic only trip, 320-560A, Three-pole, 3A, 480 Vac, 25 kAIC, Motor protection without overload release, Magnetic switch off, 11 kW at 230 Vac, 18.5 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-S3-CNA
EAN
4015081027576
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
3 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
Special features
Magnetic switch off
Amperage Rating
3 A
Voltage rating
480 Vac
Trip Type
Magnetic only
Circuit breaker type
NZMB1
Frame
NZM1
Class
Motor protection without overload release
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Rated operational current
11 kW at 230 Vac 18.5 kW at 400 Vac
Number of poles
Three-pole
Trip rating
320-560 A
Feature → Magnetic-only trip provides fast fault clearance, significantly reducing downtime and arc exposure in demanding motor-start applications, especially in conveyors and pumps. Business Impact → Improves equipment uptime and operator safety while lowering maintenance costs. Application → Ideal for high-inrush motor drives in manufacturing environments where rapid disconnection is critical. Feature → NZMB1 on the NZM1 frame ensures standardized interoperability and compact footprint. Business Impact → Simplifies sourcing, stocking, and panel design across multiple projects. Application → Fits common Eaton control panels and motor control centers requiring modular, compatible breakers. Feature → 320–560 A trip rating and 25 kAIC interrupt capacity. Business Impact → Supports a broad current window with robust fault-current withstand, reducing system-wide damage. Application → Suitable for medium to large motors operating under high fault currents in process industries. Feature → 3-pole construction with 480 Vac rating and 11 kW at 230 Vac / 18.5 kW at 400 Vac. Business Impact → Delivers dependable protection across multiple voltages with predictable performance. Application → Perfect for three-phase motors in mixed-voltage facilities. Feature → Lightweight, compact dimensions (2.68 in depth, 3.54 in width) and 3 lb weight. Business Impact → Eases panel layout, reduces cabinet size, and lowers installation time. Application → Beneficial in space-constrained control panels and retrofit projects. Feature → Warranty policy (1 year from installation or 18 months from shipment). Business Impact → Minimizes ownership risk and supports efficient procurement cycles. Application → Appropriate for projects with strict warranty and service terms.
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FAQs
Install the NZMB1-S3-CNA as a three-pole device within a compatible NZM1-based panel. Verify busbar connections, secure mounting, and ensure the 480 Vac rating aligns with system voltage. Use proper labeling and confirm cooling and clearance per OEM guidelines to maintain magnetic trip effectiveness.
Key specs include 3 A amperage rating, 320–560 A trip range, 25 kAIC short-circuit breaking capacity, 480 Vac voltage rating, magnetic-only trip, and three-pole configuration. Motor performance notes show 11 kW at 230 Vac and 18.5 kW at 400 Vac.
Yes. The magnetic-only trip in the NZMB1-S3-CNA provides rapid fault clearance for motor starting transients, reducing arc duration and equipment damage during fault conditions while enabling reliable protection without overload release.
Regional certifications such as CE, UL, and IP ratings depend on local approvals. Compliances are noted as manufacturer-guided; confirm specific certifications with Eaton or the local distributor before procurement or installation.
Warranty is Eaton Selling Policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This reduces ownership risk and supports maintenance planning and cost containment over the equipment life cycle.