Eaton NZMB1-M50 Moulded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-M50
Quick Summary
NZMB1-M50 molded case circuit breaker from Eaton protects motor-driven equipment in industrial environments. Engineers often wrestle with nuisance trips and miscoordination between protection settings and motor start-up. IP20 enclosure protection helps meet common panel-mounted safety standards, while CE and SIL certifications should be verified with the manufacturer to ensure compliance in your region. The thermomagnetic release and phase-failure sensitivity deliver precise protection for motors, while a 50 A setting at up to 440 Vac supports compact, cost-effective protection schemes. This combination reduces downtime, simplifies installation, and aligns with standard control-panel practices, offering reliability alongside a clear path to regulatory conformity and easier procurement.
Product Information
Extended Description
NZMB1-M50 Eaton: Eaton Series C molded case circuit breaker, NZM1-frame, Thermomagnetic release,10A - Trip Setting,Box,40-50A,No Aux switch,IP20,50A,3P,640-1120A,25 kAIC,63-80A,440 Vac, Thermomagnetic release,Motor protection
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-M50
EAN
4015082657116
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
Phase failure sensitive, thermomagnetic switch off
Amperage Rating
50 A
Voltage rating
440 Vac
Trip Type
T271
Circuit breaker type
NZMB1
Auxiliary switch
No
Protection
IP20
Terminals
Box Terminal
Frame
NZM1
Class
Motor protection
Setting Range Ol Protector
63-80A
Short-circuit breaking capacity
25 kAIC
Overload range
40-50A
Number of poles
Three-pole
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMB1-M50
Eaton Specification Sheet - NZMB1-M50
Feature: Three-pole NZM1 frame design provides balanced protection across all three phases. Benefit: Improves motor protection reliability and reduces uneven load stress, which translates to longer motor life and fewer unplanned outages in conveyors, pumps, and fans. Application: Suitable for three-phase motor circuits in industrial plants. Long-tail keywords: three-pole molded case circuit breaker, motor protection class, NZM1 frame. Feature: Thermomagnetic release with phase-failure sensitivity. Benefit: Delivers fast, selective trip responses to overcurrent while recognizing phase loss, minimizing collateral downtime and equipment damage. Application: Critical for start-up surges and fault conditions in manufacturing lines. Long-tail keywords: thermomagnetic release, phase failure sensitive, motor protection. Feature: Adjustable overload range 63–80 A and fixed 50 A rating. Benefit: Tailors protection to specific motor loads and operating conditions, reducing nuisance trips and preserving production continuity. Application: Motors with varying load profiles in process lines and packaging equipment. Long-tail keywords: overload range 63-80A, 50 A rating, protection settings. Feature: IP20 enclosure with box terminals. Benefit: Safe, plug-and-play wiring in standard control cabinets, enabling quicker installation and easier maintenance. Application: Panel-mounted protection in industrial control systems. Long-tail keywords: IP20 protection, box terminal, control panel mounting. Feature: Short-circuit capacity of 25 kAIC. Benefit: Strong fault-handling capability protects downstream drives and wiring from high-energy faults, reducing equipment damage and downstream downtime. Application: Safety-critical motor circuits and feeders in electrical distribution. Long-tail keywords: short-circuit breaking capacity 25 kAIC, motor protection, rugged protection. Feature: Comprehensive motor protection class and compact footprint. Benefit: Combines motor protection with space-efficient design to maximize panel density and ease of procurement. Application: Small to mid-size industrial installations with limited cabinet space. Long-tail keywords: motor protection class, compact molded case breaker, cabinet-friendly design.
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FAQs
Installation requires mounting the NZMB1-M50 on a suitable panel rail or enclosure, connecting the three phase lines to the box terminals, and ensuring correct alignment with the NZM1 frame. Verify torque specs for terminations and confirm correct phase sequence. The IP20 rating supports standard indoor control panels; consider panel ingress protection and safe de-energization practices during wiring.
Key specs include three poles, 50 A amperage rating, 440 Vac voltage rating, 25 kAIC short-circuit breaking capacity, IP20 protection, and a thermomagnetic release with phase-failure sensitivity. The overload setting range is 63–80 A, and the trip type is T271. These parameters guide proper matching to motor loads and fault conditions.
Yes. The motor-protection class, phase-failure sensitivity, and thermomagnetic trip make it well-suited for motor circuits in conveyors and pumps. Its 50 A rating and 25 kAIC capacity help protect downstream equipment from overloads and short circuits, while the IP20 enclosure supports installation in typical control panels in such applications.
The provided data does not specify CE or SIL certifications. IP20 protection is stated, but CE/SIL status should be confirmed with the manufacturer. When compliance is critical, request official certification documentation from Eaton to ensure regulatory alignment for your region and application.
Warranty follows Eaton policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. For ongoing support, refer to the Eaton seller or distributor network and request the latest service guidance, installation tips, and warranty terms specific to your region and project.