Eaton NZMB2-S63-CNA Complete MCB - 150 kAIC Rating
Part Number: NZMB2-S63-CNA
Quick Summary
Eaton NZMB2-S63-CNA is a complete molded case circuit breaker designed for motor protection in industrial control panels. Engineers frequently face nuisance trips and downtime when matching protection curves to motor start profiles and compact panel layouts. Certification specifics should be confirmed with Eaton; the data lists 'Compliances: Contact Manufacturer,' while common industry standards to verify include CE certification, IP ratings, and SIL considerations. This device delivers robust magnetically driven protection at 63 A, 440 Vac, with a 150 kAIC short-circuit capacity, while offering easy installation, compatibility with the NZM2 frame, and motor-protection without overload release. Together, these features support safer, more reliable machine operation and reduce total cost of ownership in demanding facilities.
Product Information
Extended Description
NZMB2-S63-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Magnetic only trip, Three-pole, 63A, 440 Vac, 25 kAIC, Motor protect. w/o overload release, Thermomagnetic switch off, 80-100A, 800-1250A delayed, Screw
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-S63-CNA
EAN
4015082692452
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
4.1 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
Thermomagnetic switch off
Amperage Rating
63 A
Voltage rating
440 Vac
Trip Type
Magnetic only
Circuit breaker type
NZMB2
Frame
NZM2
Class
Motor protection without overload release
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
800-1250A delayed
Setting Range Ol Protector
80-100A
Short-circuit breaking capacity
150 kAIC
Interrupt rating
25 kAIC
Connection
Screw
Rated operational current
30 kW at 230 Vac 55 kW at 400 Vac
Number of poles
Three-pole
Feature: Magnetic-only trip with adjustable short-circuit release (800-1250A delayed) enables rapid fault isolation for motor circuits. Business Impact: Minimizes arc exposure, reduces unplanned downtime, and protects upstream equipment. Application: Ideal for motor drives, conveyors, and pump circuits within industrial panels. Feature: 63 A, 440 Vac, three-pole NZMB2/NZM2 frame compatibility. Business Impact: Aligns with standard power distribution and simplifies replacement in existing lineups. Application: Suitable for new builds or retrofits in machine control panels. Feature: Short-circuit breaking capacity 150 kAIC and interrupt rating 25 kAIC. Business Impact: Delivers high fault tolerance for demanding, high-energy systems, lowering downstream component risk. Application: Critical in large motors and high-inertia loads. Feature: Motor protection without overload release and available accessories (rocker lever, motor drive). Business Impact: Reduces part count and accelerates commissioning. Application: Fits OEM equipment and retrofit projects seeking integrated protection. Feature: Screw connection and compact dimensions (4.05 in L × 7.24 in H × 4.13 in W; 4.1 lb). Business Impact: Easier field installation and replacement with predictable footprint. Application: Space-constrained control panels and compact machine enclosures.
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FAQs
NZMB2-S63-CNA uses a screw connection and is designed for the NZM2 frame, supporting three-pole configurations. Its compact dimensions (4.05 in L, 7.24 in H, 4.13 in W) and 4.1 lb weight simplify installation in space-constrained panels. For retrofit projects, confirm panel clearance and conductor termination, and align with the device’s 63 A rating and 440 Vac operation to ensure proper coordination with upstream protection.
Key metrics include a 63 A current rating, 440 Vac voltage rating, magnetic-only trip, 150 kAIC short-circuit capacity, and 25 kAIC interrupt rating. These specifications enable fast fault interruption, robust protection for high-energy motor starts, and compatibility with standard industrial power systems. The adjustable short-circuit release (800–1250 A delayed) allows tuning for startup transients, reducing nuisance trips in varying load conditions.
Yes. The three-pole NZMB2 on the NZM2 frame is well-suited for motor control centers, CNC machines, conveyors, and other customer load centers. Its motor-protection-without-overload-release class supports reliable protection where separate overload relays are not desired. With 63 A at 440 Vac and high fault-capacity performance, it aligns with mid-range to large motor protection needs in automation environments.
The data indicates compliance details should be confirmed with the manufacturer ('Compliances: Contact Manufacturer'). When sourcing, request certifications such as CE marking, IP protection ratings, and applicable SIL documentation. These confirmations ensure the device meets your plant’s safety, reliability, and regulatory requirements for motor protection in your jurisdiction.
ROI benefits come from reduced downtime due to faster fault isolation, lower replacement costs due to higher fault tolerance (150 kAIC), and simplified installation with integrated motor protection. The unit’s compact footprint and compatible NZM2 frame can shorten panel fabrication time, while the adjustable release helps tailor protection to motor start profiles, delivering predictable performance and operational efficiency.