Eaton NZMB2-AF250-BT-NA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB2-AF250-BT-NA
Quick Summary
Eaton NZMB2-AF250-BT-NA is a molded case circuit breaker for distribution protection in industrial panels. It combines a fixed thermal element with an adjustable magnetic trip to address overloads and faults without compromising selectivity. Many facilities struggle with nuisance trips and mismatched protection; this unit provides precise trip settings and a 25 kAIC interrupt rating to minimize downtime. Certifications and approvals depend on regional variants, so consult Eaton to confirm CE or UL readiness for your market and any SIL considerations. For procurement value, it supports front-frame clamp installation, box terminals, and a compact NZM2 frame, delivering reliable protection with scalable installation in mind.
Product Information
Extended Description
NZMB2-AF250-BT-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMB2, Fixed thermal, adj. magnetic trip, Three-pole, 250A, 440 Vac, 25 kAIC, Box, Distribution circuit protect., 250-250A, 1500-2500A delayed, Front frame clamp, 250-250A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB2-AF250-BT-NA
EAN
4015081072965
Product Length/Depth
5.51 in
Product Height
5.86 in
Product Width
5.86 in
Product Weight
5.17 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.
Certifications
Contact Manufacturer
Amperage Rating
250 A
Voltage rating
440 Vac
Trip Type
T185
Circuit breaker type
NZMB2
Terminals
Box
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
1500-2500A delayed
Setting Range Ol Protector
250-250A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
250-250A
Number of poles
Three-pole
250 A rating at 440 Vac in a three-pole NZMB2 unit delivers robust distribution circuit protection with a 25 kAIC interrupt capacity, ensuring fast fault clearance in demanding environments. This translates to reduced downtime, safer maintenance, and improved system reliability in control panels and motor feeders. The device uses fixed thermal protection with an adjustable magnetic trip (T185), enabling precise coordination and selective protection across feeder circuits, which minimizes unnecessary outages and optimizes energy usage. Compatibility with front-frame clamp terminals and box connections simplifies installation, supports easy retrofits, and reduces commissioning time for new builds or upgrades. Accessories like a rocker lever and motor drive option enhance operator control and motor protection, while the NZM2 frame guarantees availability of compatible spares and standardized mounting. The adjustable protection range (250–250A overload, 1500–2500A delayed for short circuits) allows tailoring to motor inrush, line faults, and process variations for cost-effective protection.
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FAQs
NZMB2-AF250-BT-NA uses a front-frame clamp and box terminals on the NZM2 frame, designed for straightforward mounting in typical distribution panels. Ensure your enclosure provides adequate space for a three-pole breaker and verify bus bar alignment and mounting clearance. The unit’s dimensions and mounting pattern align with common modular panels, reducing retrofit complexity and commissioning time.
The breaker delivers a 25 kAIC interrupt rating, indicating its capability to interrupt high fault currents safely. This rating matters for protecting feeders, motors, and distribution circuits in industrial facilities by ensuring fast fault clearing, minimizing damage to equipment, and enabling safer maintenance. Coordinate the rating with your system’s prospective fault current to ensure proper selectivity.
Yes, the NZMB2-AF250-BT-NA supports motor protection through its adjustable magnetic trip (T185) and fixed thermal element. You can set the overload limit at 250 A and configure the delayed short-circuit release within 1500–2500 A to accommodate motor inrush and fault scenarios. For motor feeders, ensure coordination with upstream devices to maintain selectivity and minimize nuisance trips.
Certifications vary by region and model variant; the product specifies 'Certifications: Contact Manufacturer.' For project compliance, verify with Eaton which CE/UL/CSA or region-specific approvals apply to your bill of materials. Eaton can provide the exact certificates for your installation location and regulatory requirements.
The product carries Eaton’s warranty policy: one year from installation or eighteen months from shipment, whichever occurs first. This coverage supports repair or replacement due to manufacturing defects and is complemented by Eaton’s service and support network for field issues, spare parts, and technical assistance during life of the installation.