Eaton NZMN3-4-AE400 Molded Case Circuit Breaker - 50 kAIC
Part Number: NZMN3-4-AE400
Quick Summary
Molded Case Circuit Breaker provides reliable power interruption for industrial control panels and distribution systems. Engineers often struggle with setting correct trip thresholds and avoiding nuisance trips during commissioning and routine maintenance. Standards such as CE compliance and enclosure IP ratings are important, with SIL readiness where approved by the manufacturer. This NZMN3-4-AE400 model delivers 400 A at 690 V with a four-pole design, 50 kAIC at 415 V, and straightforward front-screw installation, delivering dependable protection and easier maintenance.
Product Information
Extended Description
NZMN3-4-AE400 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM3-frame, NZMN3, Thermal-magnetic trip, Four-pole, 400A, 690 Vac, 50 kAIC at 415 Vac, 42 kAIC at 480 Vac, Distribution circuit protect., 200-400A, Front screw, 200-400A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMN3-4-AE400
EAN
4015082658915
Product Length/Depth
6.535 in
Product Height
7.283 in
Product Width
7.283 in
Product Weight
7.3 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
Amperage Rating
400 A
Voltage rating
690 V AC
Trip Type
T268
Circuit breaker type
NZMN3
Frame
NZM3
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
800-4400A delayed
Setting Range Ol Protector
200-400A
Short-circuit breaking capacity
50 kAIC
Interrupt rating
50 kAIC at 415 Vac 42 kAIC at 480 Vac
Connection
Front screw
Overload range
200-400A
Number of poles
Four-pole
Feature → Business Impact → Application: 400 A amperage rating with 690 V AC capability enables robust protection for heavy-duty loads in switchgear and motor control centers, reducing the risk of equipment damage and unplanned downtime. Application: Use in distribution panels where high fault currents may occur; front screw connections simplify installation and enable reliable terminations. Feature → Business Impact → Application: Four-pole NZM3 frame with a thermal-magnetic trip (T268) delivers precise overcurrent protection and fast fault interruption, improving safety and process reliability. Application: Ideal for multi-pole protection in HVAC, pumping, and extrusion lines. Feature → Business Impact → Application: Short-circuit release adjustment (800-4400 A delayed) and Ol Protector range (200-400 A) offer flexible coordination with downstream protection schemes. Application: Facilitates scalable protection schemes in evolving production lines. Feature → Business Impact → Application: Rocker lever and motor drive accessories enable quick manual operation and integration with motor control setups. Application: Streamlines maintenance and retrofit projects. Feature → Business Impact → Application: 50 kAIC interrupt rating at 415 V and 42 kAIC at 480 V ensures high fault-current tolerance. Application: Supports external fault current events in industrial networks. Feature → Business Impact → Application: Front-screw connection and NZM3 frame compatibility improve installation efficiency and retrofit compatibility. Application: Reduces commissioning time and eases spare-part management. Note: Warranty per Eaton policy (one year from installation or 18 months from shipment) provides post-sale protection and contributes to total cost of ownership reduction.
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FAQs
Install the NZMN3-4-AE400 using the front-screw terminals designed for the NZM3 frame. Align with the panel rails, connect the 690 V AC supply to the appropriate terminals, and secure with the provided mounting hardware. If using optional rocker lever or motor-drive accessories, mount and wire per the accessory instructions to enable remote operation and easier testing during commissioning.
The device is rated for 400 A and 690 V AC, with a thermal-magnetic trip (T268). It provides 50 kAIC interrupt capacity at 415 V and 42 kAIC at 480 V, with a four-pole configuration in the NZM3 frame and front-screw connection. The setting range for the overload protector is 200-400 A, and the short-circuit release is adjustable from 800-4400 A (delayed).
Yes. The 400 A rating and 690 V capability make it suitable for factory distribution panels, switchgear, and motor control centers. Its four-pole design supports multi-phase protection, and the front-screw connection simplifies installation in compact panel layouts. Ensure coordination with downstream protections and verify that the short-circuit release and OL protector settings match system fault-current levels.
Specific certifications depend on regional approvals and manufacturer listings; the product notes indicate contact with the manufacturer for compliances. In practice, these modular MCCBs are typically aligned with regional electrical standards (for example CE or other market-specific certifications) and should be confirmed with Eaton for your installation location and application.
The NZMN3-4-AE400 includes a robust 50 kAIC interrupt capacity and a modular front-access design that reduces maintenance time and downtime during service. The warranty (one year from installation or 18 months from shipment, per Eaton policy) provides protection against early component failures, contributing to lower lifecycle costs and improved process availability in harsh industrial environments.