Eaton NZMB1-S50-CNA Molded Case Breaker - Magnetic Trip
Part Number: NZMB1-S50-CNA
Quick Summary
Eaton NZMB1-S50-CNA molded case circuit breaker protects motor circuits in industrial panels. Engineers often contend with nuisance trips and motor damage due to misconfigured protection; magnetic-only trips deliver fast, decisive protection and reduce startup delays. This model uses the NZM1 frame with three poles, a 50 A rating, and a 25 kAIC short-circuit capacity at 480 Vac, designed for motor protection without overload release. Compliance details should be confirmed with the manufacturer, but the unit is built for rugged industrial environments and easy field installation. Its compact size and moderate weight support streamlined panel layouts and lower total cost of ownership over the machine lifecycle.
Product Information
Extended Description
NZMB1-S50-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Magnetic only trip, 30-55A, Three-pole, 50A, 480 Vac, 25 kAIC, Motor protection without overload release, Magnetic switch off, 1.1 kW at 230 Vac, 2.2 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-S50-CNA
EAN
4015082812645
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
50 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
2.2 kW at 400 Vac 1.1 kW at 230 Vac
Number of poles
Three-pole
Trip rating
30-55 A
Feature Magnetic trip → Business Impact → Application: The magnetic-only trip provides fast, decisive interruption during short-circuit events, reducing motor damage and unplanned downtime in high-demand drives. This supports safer startup sequences in conveyors, pumps, and machine tools, improving overall equipment effectiveness. Application: suitable for three-phase motor circuits in industrial panels. Feature NZM1 frame three-pole design → Business Impact → Application: Ensures simultaneous disconnection of all phases, preventing phase-to-phase faults and ensuring predictable protection during faults. Application: ideal for integrating with standard NZM1-based protection schemes in new or retrofit motor control centers. Feature 50 A rating at 480 Vac with 25 kAIC → Business Impact → Application: Handles typical motor loads with high fault-current tolerance, improving panel reliability and reducing nuisance trips. Application: motor-driven equipment in manufacturing lines and HVAC drives. Feature Compact footprint (2.68 in depth × 5.71 in height × 3.54 in width) and 3 lb weight → Business Impact → Application: Simplifies panel packing, reduces enclosure space, and speeds installation. Application: retrofit projects or new builds with tight space constraints. Feature Motor protection without overload release → Business Impact → Application: Provides protective action against short circuits while relying on separate overload devices or relays for thermal protection, offering flexible protection coordination. Application: motors driven by direct magnetic protection in assembly lines. Feature Warranty and compliance notes → Business Impact → Application: Warranty policy supports service continuity; compliance details are confirmed with the manufacturer, ensuring procurement alignment. Application: reliable procurement and long-term service planning for industrial automation projects.
Get a Quick Quote for a Eaton NZMB1-S50-CNA
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton NZMB1-S50-CNA?
Enquire Now
FAQs
The NZMB1-S50-CNA is a three-pole device designed for standard three-phase panels. Mount the breaker in an appropriate NZM1-frame slot, connect three phase conductors to the input terminals, and land the output conductors to the protected load. Verify proper torque values per Eaton guidelines and ensure panel clearance for the 2.68 in depth; use appropriate wiring sleeves and field-terminations for a secure, vibration-tolerant installation.
A magnetic-only trip responds to short-circuit faults with rapid disconnection, independent of a thermal overload element. Use it when you need fast fault clearance for motor circuits with predictable overload protection provided by upstream relays or separate overload devices. This reduces motor damage from short circuits and minimizes downtime from nuisance overload trips.
Yes, the NZMB1-S50-CNA is rated for 480 Vac and a nominal 50 A load with a short-circuit rating of 25 kAIC. It is suitable for three-phase motors and related loads in manufacturing equipment, conveyors, or pumps. For continuous duty and fuse coordination, pair it with proper overload protection where required by the motor starter scheme.
Compliances are listed as Contact Manufacturer, so verify specific certifications with Eaton for your region. The product carries Eaton’s warranty policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. For procurement and service planning, note the EAN 4015082812645 and catalog number NZMB1-S50-CNA.
The magnetic trip provides fast protection, reducing motor damage and downtime after faults, which translates to improved line uptime and lower maintenance costs. Its compact NZM1 frame supports easier panel integration, potentially reducing installation time and enclosure space. Over the life of the equipment, this leads to lower total cost of ownership and greater system reliability.