Eaton NZMB1-S18-CNA Molded Case Breaker - Magnetic 25 kAIC

Part Number: NZMB1-S18-CNA
Manufacturer
Eaton
Part number
NZMB1-S18-CNA

Quick Summary

NZMB1-S18-CNA is a magnetic-only molded case circuit breaker designed for motor protection in three-phase industrial drives. For engineers facing nuisance trips and the challenge of reliable protection at 480 Vac, this device minimizes false tripping and simplifies coordination with the NZM1 frame. Certification status should be confirmed with the manufacturer; while the NZM/NZMB1 family commonly aligns with CE and UL listings and IP-rated enclosures in various regions. This solution delivers fast magnetic protection and a compact footprint, supporting efficient panel design and predictable maintenance, with a clear focus on motor protection without overload release.

Product Information

Extended Description

NZMB1-S18-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Magnetic only trip, 208-338A, Three-pole, 18A, 480 Vac, 25 kAIC, Motor protection without overload release, Magnetic switch off, 5.5 kW at 230 Vac, 11 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-S18-CNA
EAN
4015081028610
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
2.45 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
18 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
5.5 kW at 230 Vac 11 kW at 400 Vac
Number of poles
Three-pole
Trip rating
208-338 A
Feature: Magnetic-only trip enables rapid short-circuit isolation. Business Impact: Reduces downtime by delivering fast fault clearance in 3-phase motor circuits, improving equipment uptime and safety. Application: Ideal for industrial drives and panelboards where quick response to faults is critical. Feature: Amperage rating of 18 A aligns with typical motor protection loads. Business Impact: Ensures proper protection without oversizing, lowering total installed cost and improving coordination with upstream protection. Application: Suitable for 18 A motor circuits in manufacturing lines and automation cabinets. Feature: Short-circuit breaking capacity of 25 kAIC provides robust fault withstand. Business Impact: Elevates system resilience against high-energy faults, reducing collateral damage to feeders and downstream devices. Application: Panels and switchgear serving medium-power motors. Feature: NZM1 frame compatibility simplifies panel design and interchangeability. Business Impact: Streamlines retrofits and reduces spare part variety, lowering maintenance time and inventory. Application: New installations and upgrades within existing NZM1-based systems. Feature: Motor protection without overload release offers a focused protection approach. Business Impact: Eliminates unnecessary coordination with overload relays in simple motor circuits, reducing wiring and setpoint discrepancies. Application: Clean, cost-effective protection for motor circuits where separate overload is provided elsewhere. Feature: Performance metrics include 5.5 kW at 230 Vac and 11 kW at 400 Vac. Business Impact: Clear, actionable performance expectations aid design engineers in selecting appropriate protective devices for given motor loads. Application: Small to mid-size motors in manufacturing and processing lines.

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FAQs

NZMB1-S18-CNA is a three-pole magnetic-only MCCB designed for NZM1 frame assemblies. It fits standard NZM1-based panelboards and drive enclosures, supports 480 Vac systems, and integrates with motor control schemes where space-saving protection is required. Ensure mounting footprint and DIN rail compatibility align with your enclosure design.
Key specs include 18 A amperage rating, 480 Vac voltage rating, three-pole configuration, and 25 kAIC short-circuit breaking capacity. It is intended for motor protection without overload release, with a trip type that is magnetic only. Verify the exact regional compliance status with Eaton prior to purchase.
Yes. The device protects motors up to 5.5 kW at 230 Vac and 11 kW at 400 Vac within its rated magnetic trip range. It provides fast fault isolation in magnet-only protection schemes, and may be paired with an external overload relay if overload protection is required in your application.
Certification status should be confirmed with the manufacturer. Typical regional listings for Eaton NZM/MNZMB1 style devices include CE and UL markings, along with enclosure IP ratings where applicable. Always request current certification documentation for your target market and panel requirements.
Eaton’s policy provides a warranty of one year from installation or eighteen months from shipment, whichever occurs first. For maintenance, rely on regular inspections of the magnetic trip mechanisms and contact Eaton for service guidance if there are repeated nuisance trips or abnormal operation.