Eaton NZMN3-AEF300-NA Molded Case Circuit Breaker - UL Listed
Part Number: NZMN3-AEF300-NA
Quick Summary
NZMN3-AEF300-NA molded case circuit breaker provides reliable overcurrent protection for distribution panels. Engineers often face challenges coordinating trips and maintaining uptime in harsh industrial environments. UL Listed certification supports safety compliance across North American electrical installations. With the NZMN3 frame and front screw connections, this unit enables fast installation and scalable protection, while optional rocker lever and motor drive accessories simplify integration into existing control architectures. The 300 A rating and 690 V AC capacity support mid-size power distribution without oversizing. Designed for distribution circuit protection, it offers predictable trip characteristics and long-term reliability, helping maintenance teams reduce downtime and spare-part inventories. This aligns with Eaton's broader NZM3 family for consistent performance.
Product Information
Extended Description
NZMN3-AEF300-NA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM3-frame, NZMN3, Thermal-magnetic trip, 600-3300A delayed, Three-pole, 300A, 690 Vac, 50 kAIC at 415 Vac, 42 kAIC at 480 Vac, Distribution circuit protect., Front screw, 300-300A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMN3-AEF300-NA
EAN
4015082692766
Product Length/Depth
6.535 in
Product Height
5.512 in
Product Width
5.512 in
Product Weight
13.977 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
UL Listed
Amperage Rating
300 A
Voltage rating
690 V AC
Trip Type
T268
Circuit breaker type
NZMN3
Frame
NZM3
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Rating plug
300A
Setting Range Ol Protector
300-300A
Short-circuit breaking capacity
50 kAIC
Interrupt rating
50 kAIC at 415 Vac 42 kAIC at 480 Vac
Connection
Front screw
Overload range
300-300A
Number of poles
Three-pole
Trip rating
600-3300 A delayed
Compact circuit-breakers and switch-disconnectors up to 1600 A
Eaton Specification Sheet - NZMN3-AEF300-NA
Thermal-magnetic trip technology within the NZMN3-AEF300-NA provides precise overload and short-circuit protection (trip class T268). This coordination minimizes nuisance trips and motor wear, extending equipment life in fluctuating loads. In distribution panels for manufacturing lines or processing equipment, you gain predictable responses that support safer, more reliable operation. Three-pole design in the NZM3 frame supports balanced protection across all phases. It is rated at 300 A and 690 V AC, accommodating common industrial distributions while fitting compact control cabinets. With a setting range of 300-300 A, it offers precise overload protection tuned to motor and circuit characteristics. Short-circuit breaking capacity of 50 kAIC at 415 VAC and 42 kAIC at 480 VAC lets this breaker safely interrupt high fault currents typical in industrial environments. This rating reduces risk to downstream equipment and minimizes downtime due to protection-related failures. Front screw connections simplify field wiring and increase termination reliability. Accessories including rocker lever and motor drive expand control options and integration with motor starters. Front-access installation and NZM3 family compatibility streamline spare parts management and maintenance planning. Warranty coverage, UL Listed certification, and alignment with Eaton's NZM3 family provide a clear service horizon for long-term reliability and compliance.
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FAQs
This breaker uses front screw terminations and is designed for three-pole mounting in the NZM3 frame. It fits standard distribution panels, enables front-access wiring for rapid terminations, and offers optional rocker lever and motor drive accessories to simplify control integration.
Trip type is T268 with a 300 A current rating and 690 V AC voltage rating. It provides 50 kAIC at 415 V and 42 kAIC at 480 V, is three-pole, and supports a 300-300 A overload setting for precise coordination in distribution circuits.
Yes. The unit carries UL Listed certification, confirming compliance with essential safety standards for electrical protection devices. Its 300 A rating, high fault-current ratings, and front-access wiring make it suitable for reliable distribution panel protection in industrial settings.
Yes. The model supports rocker lever and motor drive accessories, enabling manual control, sequencing, and enhanced motor protection. The NZM3 frame ensures consistent mounting with other devices, simplifying integration and spare-parts planning.
Maintenance is straightforward due to standard termination and components; UL listing supports ongoing safety compliance. Expect reduced downtime from reliable protection, easier procurement within the NZM3 family, and lower lifecycle costs thanks to consistent performance and spare-parts availability.