NH fuses (also known as NH Knife Blade Fuses or DIN NH Blade Fuses) were defined in the German DIN standard 43620 around 1944. They were primarily designed as general purpose fuses for the protection of conductors. NH fuses are one-time fuses, meaning once they have blown, they must be replaced with a new fuse with the same characteristics.
NH Fuse Construction:
NH fuses are constructed from a rectangular ceramic casing enclosed by a cover plate that features a metal blade style terminal on each end. The fuse element inside the casing is connected to the cover plate / blade terminals. The majority of NH Fuses have a trip indicator to show if the fuse element has blown. Each cover plate includes a metal extraction lug that enables quick removal of the fuse from a holder when using the recommended NH fuse puller tool.
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How to Choose the Right NH Fuse
Physical Dimensions
Identify and choose the correct frame size required for your application, including common sizes like NH00, NH1, NH2, NH3, and NH4.
Electrical Ratings
Select a rated voltage equal to or greater than your system voltage. Ensure the current rating matches your requirements; improper current selection will fail to protect the circuit effectively.
Fuse Base or Disconnector
Complement your fuse with the appropriate mounting solution. Options include fuse bases or fuse disconnectors, available in configurations from 1-pole to 4-poles.
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Manufacturing Quality & Standards
Our production facility possesses extensive experience in manufacturing the NH series fuses. To ensure safety and reliability for global markets, our products have successfully passed CE certification, making them suitable for sale within EU countries. By utilizing high-quality ceramics and premium-grade copper, we provide superior product durability and electrical conductivity. We are committed to providing reliable protection solutions and professional customer support.
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Frequently Asked Questions
What are NH fuses primarily used for?
NH fuses are designed as general-purpose fuses primarily used for the protection of electrical conductors and industrial power distribution systems.
Can an NH fuse be reused after it blows?
No, NH fuses are one-time use components. Once the internal fuse element has blown to protect the circuit, the entire fuse must be replaced with a new one.
What are the common sizes of NH blade fuses?
The most common physical sizes defined by international standards include NH00, NH1, NH2, NH3, and NH4.
How can I tell if an NH fuse has blown?
The majority of NH fuses are equipped with a mechanical trip indicator on the casing or cover plate that clearly shows if the internal element has operated.
What materials are used in the construction of your NH fuses?
We use high-quality industrial ceramics for the rectangular casing and high-grade copper for the blade terminals to ensure optimal heat resistance and conductivity.
Are your products compliant with international standards?
Yes, our NH fuses are manufactured according to DIN standards and have passed CE certification, ensuring compliance with rigorous safety and quality requirements.
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