Eaton NZMH4-AE1250-S1 Molded Case Breaker - IEC Rated
Part Number: NZMH4-AE1250-S1
Quick Summary
Eaton NZMH4-AE1250-S1 molded case circuit breaker is designed for reliable distribution protection in industrial control panels. Engineers often face nuisance trips and difficult integration with motor drives in crowded electrical rooms. This model carries IEC Rated certification and supports a 690 V AC rating with 85 kAIC interrupt capability for robust safety. Its NZM4 frame, three-pole configuration, and front screw connections streamline installation, while the rocker lever enables quick operation in demanding environments. For procurement teams, the high amperage rating of 1250 A translates to lower maintenance costs and longer service life across large facilities.
Product Information
Extended Description
NZMH4-AE1250-S1 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM4-frame, NZMH4, Thermal-magnetic trip, Three-pole, 1250A, 690 Vac, 85 kAIC at 480 Vac, Distribution circuit protection, Rocker lever, motor drive, Front screw, 50/60 Hz, 630-1250A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMH4-AE1250-S1
UPC
786685690018
Product Length/Depth
8.26 in
Product Height
8.14 in
Product Width
8.14 in
Product Weight
46 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
IEC Rated
Amperage Rating
1250 A
Voltage rating
690 V AC
Trip Type
T268
Circuit breaker type
NZMH4
Frame
NZM4
Frequency rating
50 to 60 Hz
Class
Distribution circuit protection
Accessories
Rocker lever, motor drive
Interrupt rating
85 kAIC at 480 Vac
Connection
Front screw
Overload range
630-1250A
Number of poles
Three-pole
Feature: Thermal-magnetic trip (T268) provides precise coordination and fast fault isolation → Business Impact: Reduces nuisance trips and protects critical loads, minimizing unplanned downtime → Application: Suitability for high‑demand motor drives and distribution circuits in harsh industrial environments. Feature: NZM4 frame compatibility and front screw connection simplify field retrofit and new panel builds → Business Impact: Faster commissioning, reduced field labor, improved installation quality → Application: Fast integration in retrofit projects or new installations with standard NZM4 enclosures. Feature: Three-pole configuration with 1250 A rating and 690 V AC operation → Business Impact: High-current distribution protection with broad voltage headroom, enabling scalable panel design → Application: Large manufacturing lines, processing plants, and high‑power motor systems. Feature: 85 kAIC interrupt rating at 480 V and 50/60 Hz electrical compatibility → Business Impact: Enhanced fault current handling and compliance with utility coordination requirements → Application: Critical distribution networks and motor-control centers. Feature: Accessories including rocker lever and motor drive option → Business Impact: Improved manual operation and integration with motor-control schemes, reducing training time → Application: Panels requiring ergonomic operation and drive-enabled protection. Feature: 630–1250 A overload range and front-accessibility design → Business Impact: Flexible settings for different load profiles, with straightforward field adjustments → Application: Customizable protection for mixed loads in industrial panels. Feature: IEC Rated certification and robust mechanical construction → Business Impact: Regulatory alignment and durable performance in demanding environments → Application: Global projects needing consistent protection standards.
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FAQs
For 690 V networks, confirm panel clearance for an 8.14 in width and height footprint and ensure front-screw terminals are accessible for secure torque. Use the NZM4 frame compatibility to match existing enclosures, and select the rocker lever option if frequent manual operation is anticipated. Verify 50/60 Hz compatibility and proper coordination with upstream protective devices to optimize fleet protection.
The device uses a thermal-magnetic trip (T268) with a 630–1250 A overload range, allowing precise protection for motor drives and associated loads. In practice, this reduces nuisance trips during startup surges while maintaining rapid fault interruption for short-circuit events. This makes it suitable for high‑power motor control centers and drive-fed distribution circuits.
Yes. The NZMH4-AE1250-S1 is designed for the NZM4 frame and uses front screw connections, enabling straightforward installation and replacement in existing NZM4-based panels. The front-accessible design also facilitates maintenance checks and quick field adjustments without removing the device from the enclosure.
The product is IEC Rated, indicating compliance with international protection standards for electrical devices. This certification, combined with the 690 V AC rating and 85 kAIC interrupt capability, supports compliance in global projects, simplifies procurement for multinational facilities, and aligns with common electrical safety and protection requirements in industrial settings.
With a durable molded case design and thermal-magnetic trip for reliable protection, maintenance intervals focus on visual inspections, torque checks on front screws, and periodic tests of trip functionality. The high amperage rating reduces the need for undersized devices, potentially lowering total ownership costs through improved uptime, fewer trips, and longer service life in high‑demand applications.