Mersen A219305 - NH fuse-bases are available for delivery in single-pole and three-pole designs and can be closely mounted in parallel rows. Each three-pole base is upplied with two phase-partition walls. NH-ISO plugon covers which clip onto the contact springs can also be supplied for these bases. Ceramic fuse-bases in sizes 00 to 3 are provided with a single-part steatite base, while size 4 has a metal baseplate with 2 ceramic bases. Plastic fuse-bases have a single-part plastic base. The stable silver-plated contact springs are made of electrolytic copper and formed from one piece. Separate springing is provided by highly resilient captive steel springs, making the contact invulnerable to high thermal stress. Size 4 NH fuse-bases are designed for size 4 fuse-links with 8 mm contact blades. Size 4a fuse-bases are designed for size 4a fuse-links with 6 mm contact blades 0 mount 0 connector single NH2 and NH3 cable terminal .
Mersen

A219305

Alternate Item Number: 3605340240801

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Minimum Qty: 15

Multiplier: 15

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Overview

Mersen NH fuse-bases (SKU: A219305) deliver reliable, high-performance electrical protection for industrial low-voltage systems. Available in single-pole and three-pole designs, these fuse-bases support sizes 00 to 4a with ceramic, steatite, metal, or plastic bases, ensuring compatibility with diverse applications. Three-pole bases include phase-partition walls for enhanced safety, while NH-ISO plug-on covers (sold separately) provide additional protection against accidental contact. The stable silver-plated contact springs, made from electrolytic copper, ensure superior conductivity and resilience under high thermal stress. Separate captive steel springs maintain consistent pressure, preventing loosening even in demanding environments. Size 4 bases accommodate 8mm contact blades for NH2 fuse-links, while size 4a bases support 6mm blades for NH3 fuse-links, with rated currents up to 1250A for size 4 variants. Installation flexibility is maximized with multiple connection options: screw terminals for secure, permanent mounting, or clamp terminals for DIN rail compatibility. Plastic bases (sizes 00-4) offer lightweight solutions for compact panels, while ceramic and steatite bases provide superior heat resistance for high-power applications. Size 4 metal baseplates with dual ceramic bases deliver robust performance in extreme conditions. Ideal for industrial switchgear, motor control centers, and power distribution systems, Mersen NH fuse-bases meet IEC standards for low-voltage fuse systems. Their modular design allows parallel mounting in tight spaces, reducing panel footprint without compromising safety or performance. Backed by Mersen’s engineering expertise, these fuse-bases ensure long-term reliability in critical electrical infrastructure.
  • Sizes 00 to 4a with ceramic, steatite, metal, or plastic bases
  • Single-pole and three-pole designs with phase-partition walls for safety
  • Silver-plated electrolytic copper contact springs with captive steel springs
  • Rated currents up to 1250A (size 4) with 8mm/6mm contact blade compatibility
  • Screw or clamp terminals for DIN rail or panel mounting

Specifications

Application
NH fuse-bases are designed for fuse-links with rated voltages up to 690VAC and 440VDC.
Brand Name
Ferraz Shawmut
Connection Type
NH2/NH3 Cable Terminal
Connection Type
NH2 and NH3 cable terminal
Material
Ceramic, Steatite, Metal, Plastic
Mounting Type
Parallel Rows, Mounting with Phase-Partition Walls
Mounting Type
Parallel rows, closely mounted
Poles
Single-pole, Three-pole
Series
NH Fuse-Bases
Size
00 to 4a
Standard
IEC 60269 Compliance Dimensions in accordance with DIN 43622
Type
IEC NH Fuse Bases
Voltage Rating
690 VAC
Package Dimensions (L x W x H)
1.6 IN x 0.65 IN x 0.75 IN
Package Dimensions (L x W x H)
4.064 cm x 16.51 mm x 19.05 mm
Package Weight (Imperial)
0.792 L
Package Weight (Metric)
0.359 kg
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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.

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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.