Eaton NZMH2-4-A20 NZM Complete MCCB - Adjustable Trip
Part Number: NZMH2-4-A20
Quick Summary
NZMH2-4-A20 is a NZM complete molded case circuit breaker designed for distribution panels and motor-control applications. It provides precise overcurrent protection with an adjustable thermal and magnetic trip, four-pole configuration, and a compact footprint. Engineers often struggle to balance safety, selectivity, and space within control panels, especially in high-energy 690 Vac systems. This device delivers high short-circuit capacity (up to 150 kAIC) while offering a straightforward front-screw connection and available rocker lever or motor-drive accessories for easy retrofits. In regulated environments, CE marking and IEC 60947-2 compliance are common expectations, with UL recognition in North America where required. Leveraging this breaker can improve uptime and reduce wiring and maintenance costs, translating to lower total cost of ownership over time.
Product Information
Extended Description
NZMH2-4-A20 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM2-frame, NZMH2, adj. thermal, adj. magnetic trip, Four-pole, 20A, 690 Vac, 750 Vdc, 85-150 kAIC, Distribution circuit protection, 15-20A, 350-350A delayed, Front screw, 15-20A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMH2-4-A20
EAN
4015082812874
Product Length/Depth
4.05 in
Product Height
7.24 in
Product Width
4.13 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.
Compliances
Contact Manufacturer
Amperage Rating
20 A
Voltage rating
690 Vac, 750 Vdc
Trip Type
Adjustable thermal, adjustable magnetic
Circuit breaker type
NZMH2
Frame
NZM2
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Adjustment range short-circuit release
350-350A delayed
Setting Range Ol Protector
15-20A
Short-circuit breaking capacity
150 kAIC
Interrupt rating
85-150 kAIC
Connection
Front screw
Overload range
15-20A
Number of poles
Four-pole
Feature: Adjustable thermal and magnetic trip → Business Impact: Tailors protection to load profiles, reducing nuisance trips and protecting equipment → Application: Ideal for distribution panels and motor-control centers with varying loads. Feature: Four-pole NZMH2 frame → Business Impact: Ensures complete phase protection and coordinated shutdown for reliable 3‑phase operation → Application: Industrial power distribution and MCCs. Feature: Voltage rating 690 Vac / 750 Vdc → Business Impact: Supports both AC distribution and DC control architectures, enabling broader system integration → Application: Mixed-power panels and control gear in factories. Feature: Short-circuit rating 150 kAIC → Business Impact: Withstands high fault currents, improving system safety and reducing damage risk → Application: Main feeders and high-energy circuits. Feature: Front screw connection with available rocker lever and motor-drive accessories → Business Impact: Speeds installation, simplifies maintenance, and enables easy retrofits or upgrades → Application: New panel builds and modernizing legacy installations. Feature: Setting range 15-20A OL and 350-350A delayed SC release → Business Impact: Flexible coordination with downstream protection to optimize protection schemes → Application: Customizable protection in control panels and power distribution layouts.
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FAQs
The NZMH2-4-A20 uses a front screw connection for straightforward wiring. Ensure proper torque per Eaton installation guidelines, secure all conductors, and mount the device in a suitable panel cavity. Use the compatible rocker lever or motor-drive accessory if you plan to retrofit or automate operation.
Key specs include a four-pole NZM2 frame, 20 A rating, voltage rating of 690 Vac / 750 Vdc, short-circuit capacity up to 150 kAIC, adjustable thermal and magnetic trip, and a 15-20 A overload setting with a 350-350 A delayed short-circuit release. Connection is front screw, with compatible accessories available.
Yes. Its four-pole design, adjustable thermal-magnetic trip, and high interrupt rating support motor-control centers and motor protection schemes. Ensure the trip settings are coordinated with upstream protection and that the device is properly integrated into the control panel wiring.
Available accessories include a rocker lever for manual operation and a motor-drive option to enable remote or automated control, simplifying installation and future upgrades in panel boards or control gear.
The product carries Eaton’s standard warranty policy 25-000 (one year from installation or eighteen months from shipment, whichever occurs first). Compliance is listed as 'Contact Manufacturer' for confirmation of regional standards and certifications such as CE or IEC 60947-2; verify applicable approvals with your Eaton representative.