Eaton NZMH1-4-A40 Molded Case Circuit Breaker - 100 kAIC
Part Number: NZMH1-4-A40
Quick Summary
NZMH1-4-A40 molded case circuit breaker is a reliable protection device for industrial distribution panels and machinery. Engineers often struggle to balance high fault-current demands with nuisance trips and downtime. While exact compliance details should be confirmed with the manufacturer, this unit features a thermal-magnetic trip with a high fault-current capacity and is suitable for up to 690 Vac and 500 Vdc environments. By combining robust protection with straightforward installation, it supports safer, more reliable electrical distribution and lowers total cost of ownership for industrial facilities.
Product Information
Extended Description
NZMH1-4-A40 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMN1, Thermal-magnetic trip, 320-400A trip rating, Four-pole, 40A, 690 Vac, 500 Vdc, 50 kAIC, Distribution circuit protection, 32-40A, Front frame clamp, 32-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMH1-4-A40
EAN
4015082844226
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 in
Product Weight
4.7 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
40 A
Voltage rating
690 Vac, 500 Vdc
Trip Type
T268
Circuit breaker type
NZMN1
Frame
NZM1
Class
Distribution circuit protection
Accessories
Rocker lever
Setting Range Ol Protector
32-40A
Short-circuit breaking capacity
100 kAIC
Interrupt rating
50 kAIC
Connection
Front frame clamp
Overload range
32-40A
Number of poles
Four-pole
Trip rating
320-400 A
Four-pole NZMN1 frame design provides comprehensive three-phase plus neutral protection, enabling coordinated shutoff in distribution panels and heavy machinery. This design reduces wiring complexity and improves panel density, delivering a measurable efficiency gain during installation and future maintenance. The device uses a thermal-magnetic trip (T268) to deliver fast, selective protection, which minimizes nuisance trips and protects motors and drives from overheating, increasing uptime and reducing energy waste in manufacturing lines. A high short-circuit capacity of 100 kAIC ensures robust fault handling in high-current environments, guarding downstream equipment and personnel while supporting compliant protection schemes in critical facilities. With a 690 Vac / 500 Vdc rating and an adjustable setting range of 32-40 A, the breaker aligns with varying loading profiles and enables precise protection without over- or under-tripping. Front frame clamp connectivity simplifies mounting and serviceability, while the rocker lever accessory enhances operability in tight panels. The included warranty terms provide a clear service horizon, reducing lifecycle risk for panel builders and maintenance teams.
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FAQs
NZMH1-4-A40 uses a four-pole NZMN1 frame with a front frame clamp connection, designed for easy mounting in distribution panels and compact switchboards. It supports front-frame wiring and optional accessories like a rocker lever for improved operation in tight spaces. For installation, verify panel cutouts, torque specs for clamps, and alignment with the NZM1 frame footprint.
Key specs include a 40 A amperage rating, 690 Vac / 500 Vdc voltage support, and a thermal-magnetic trip (T268). It offers a short-circuit breaking capacity of 100 kAIC and an interrupt rating of 50 kAIC. The setting range for overload protection is 32-40 A and it is a four-pole device designed for distribution protection.
Yes. With 100 kAIC short-circuit capacity and a 50 kAIC interrupt rating, the unit is designed to withstand large fault currents typical in heavy machinery, installations with long feeders, or densely loaded distribution panels. The 690 Vac and 500 Vdc ratings also support diverse industrial electrical networks without compromising protection reliability.
The data provided lists compliance as 'Contact Manufacturer,' so you should verify current certifications with Eaton directly. Typical industry expectations for similar NZM breakers include CE and UL listings depending on regional requirements; confirmation from the manufacturer ensures the exact regulatory certifications for your project.
The product is covered by Eaton's warranty policy, stated as one year from installation or eighteen months from shipment, whichever occurs first. Maintenance considerations include the thermal-magnetic trip mechanism’s reliability, Front frame clamp mounting ease, and the availability of the rocker lever accessory to facilitate long-term operability and reduced service time.