Eaton NZMB1-S100-CNA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-S100-CNA
Quick Summary
NZMB1-S100-CNA molded case circuit breaker provides magnetic-only protection for motor and line protection in industrial automation. Engineers often face nuisance trips and the need for reliable, fast switching in compact frames, which can disrupt production and increase maintenance costs. While this model aligns with typical industry standards for magnetic protection, the datasheet notes Compliances as Contact Manufacturer, so confirm country-specific approvals with Eaton. By selecting this unit you gain compact, robust protection that supports uptime, streamlined panel design, and easier maintenance, with the added benefit of a 100 A rating and 25 kAIC interrupt capacity for demanding 3-phase systems.
Product Information
Extended Description
NZMB1-S100-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Magnetic only trip, 84-144A, Three-pole, 100A, 480 Vac, 25 kAIC, Motor protection without overload release, Magnetic switch off, 3 kW at 230 Vac, 5.5 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-S100-CNA
EAN
4015082812676
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
100 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
3 kW at 230 Vac 5.5 kW at 400 Vac
Number of poles
Three-pole
Trip rating
84-144 A
Feature: Magnetic-only trip provides fast, decisive fault isolation. Business Impact: Reduces nuisance trips and minimizes process downtime, improving line reliability in demanding automation applications. Application: Motor control circuits in 480 Vac three-phase systems. Feature: 100 A amperage rating with 25 kAIC short-circuit capacity. Business Impact: Protects equipment and wiring from high fault currents while enabling smaller feeders and compliant protection zones. Application: Main protection in industrial motor drives and line feeders. Feature: NZM1 frame with three-pole construction. Business Impact: Delivers a compact footprint for tight panel layouts and simplified wiring, lowering installation time and space needs. Application: Control cabinets in packaging, plastics, and material handling. Feature: Motor protection without overload release. Business Impact: Reduces nuisance maintenance by limiting unnecessary overload coordination adjustments while ensuring motor circuits are quickly interrupted on short circuits. Application: Inverter-driven orDirect-on-Line motor applications. Feature: Magnetic switch off and mechanical reliability. Business Impact: Improves safety and uptime with predictable, durable operation and straightforward troubleshooting. Application: Routine maintenance and rack-mounted panels in automation lines. Feature: 84-144 A trip rating and 3-pole design. Business Impact: Clear, scalable protection for mid-range motors and multi-motor sets, enabling straightforward phasing and coordination. Application: Three-phase motors in conveyors, presses, and assembly lines.
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FAQs
When installing the NZMB1-S100-CNA, ensure it is mounted in a suitable enclosure with proper clearance for the NZM1 frame. Use proper torque on terminals, follow panel wiring diagrams, and confirm that the 3-pole configuration matches your three‑phase supply. Verify compatibility with downstream devices and ensure the magnetic trip type suits your motor protection strategy.
Key specs include a 100 A rating and a 25 kAIC interrupt capacity, with a magnetic-only trip. This combination supports swift fault isolation in motors and feeders while limiting arc energy. The unit also handles 84–144 A trip range, suitable for mid‑range motor protection and coordinated protection schemes in three‑phase systems.
Yes. The product is described as Motor protection without overload release, which means it provides magnetic protection for faults without an integrated overload relay function. This makes it ideal for applications where magnetic trip protection is sufficient and overload coordination is managed separately.
The datasheet lists Compliances as Contact Manufacturer, so exact country-specific certifications (such as CE or UL) should be confirmed with Eaton. This ensures you meet regional regulatory requirements and site-specific approvals before deployment in your manufacturing line.
With a magnetic-only design and a compact NZM1 frame, maintenance is typically straightforward and less complex than multi-function devices. The 25 kAIC short‑circuit rating supports robust protection, reducing downtime costs from electrical faults. The 1‑year warranty (or 18 months from shipment) provides initial protection against manufacturing defects, supporting total cost of ownership improvements.