Mersen C227978 - The NH system is classified among plug-in fuse systems and is composed of: • fuse-base (possibly including terminal covers and phase barriers) • fuse-link with blade contact • fuse-link replacement device (LV HRC fuse puller) Since the design of this system cannot guarantee non-interchangeability of rated current it must be handled by a qualified professional. Type aM NH fuse-links are partial-range breaking capacity fuse-links, used to protect motor circuits as they are strongly current-limiting and have low power losses. They interrupt currents from 6.3 times In up to their maximum breaking capacity and are therefore suited for short-circuit protection only. They must be associated with other switchgear for protection against overloads. These fuse-links can have a rated current equal to the motor's nominal current. 500 Volts 500 amps aM NH2 series.
Mersen

C227978

Alternate Item Number: 3605340277142


Documents & Media
Specification Sheet

Contact for Pricing

Minimum Qty: 3

Multiplier: 3

*Contact for lower quantities*

Overview

The Mersen C227978 aM NH2 Series NH fuse-link is a partial-range breaking capacity fuse designed for motor circuit protection in industrial applications. Rated at 500V and 500A, this fuse-link is part of the NH plug-in fuse system, which includes a fuse-base, fuse-link with blade contact, and a fuse-link replacement device (LV HRC fuse puller). The aM series is specifically engineered for short-circuit protection, interrupting currents from 6.3 times the rated current (In) up to its maximum breaking capacity, making it ideal for protecting motor circuits where high inrush currents are common. Key specifications include a voltage rating of 500V AC and a current rating of 500A, with a size NH2 design. The fuse-link features low power losses and strong current-limiting properties, ensuring efficient operation and reduced energy waste. It must be handled by qualified professionals due to its non-interchangeable rated current design, which prevents improper installation and enhances safety. The C227978 is manufactured by Mersen, a trusted name in industrial electrical protection, and is distributed in the US. It is designed to be used in conjunction with other switchgear for overload protection, as it is not rated for overload protection itself. The NH2 series is widely used in motor control centers, industrial machinery, and other applications where reliable short-circuit protection is critical. This fuse-link is part of the IEC NH low-voltage fuse system, which is compliant with DIN VDE 0636-2 and other international standards. It is suitable for use in environments requiring high breaking capacity and durability, such as manufacturing plants, power distribution systems, and commercial buildings. The Mersen C227978 aM NH2 Series fuse-link is a cost-effective and reliable solution for protecting motor circuits from short-circuit faults, ensuring operational safety and minimizing downtime.
  • Rated 500V AC and 500A for motor circuit protection
  • Partial-range breaking capacity fuse for short-circuit protection only
  • Interrupts currents from 6.3 times In up to maximum breaking capacity
  • Part of the NH plug-in fuse system with blade contacts
  • Must be used with other switchgear for overload protection

Specifications

Amperage Rating
500 A
Application
aM: Partial purpose, motor circuit protection
Brand Name
Ferraz Shawmut
Connection
Blade
Interrupt Rating
120 kA
Mounting
Clip
Special Features
Dimensions according to DIN 43 620 parts 1 to 4 Non-isolated gripping lugs Double indicator Lead free contact blades 0% cadmium
Standard
DIN 57636 Part 201 VDE 0636 Part 201 IEC 60269-1 and -2
Type
IEC NH Fuse-Links
Voltage Rating
500 VAC
Package Dimensions (L x W x H)
5.91 IN x 1.85 IN x 1.53 IN
Package Dimensions (L x W x H)
15.0114 cm x 4.699 cm x 3.8862 cm
Package Weight (Imperial)
1.410 L
Package Weight (Metric)
0.640 kg
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in
POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.