NH Fuse Links and Bases

Applications

This series of fuse links is mainly used in AC 50Hz,rated voltage up to 1140V, rated current up to 1250A and for pro-tecting electric equipment from overload and short-circuit. It can reliably break the min. fusion current to any current wit-hin 120KA.It is also available for the protection of semiconductor parts and equipments against short-circuit (type aR) and prote-ction of motors (type aM).This series of fuse links conforms to GB13539 and IEC 60269 standards.

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Your Professional NH Fuse Links And Bases Supplier

Founded in 1988, Chifeng Electric has evolved to be a competitive fuse brand in China with well-established and growing platforms in circuit protection technologies. We offer the industry's broad portfolio of fuse products, and We focus on solar markets while expanding into adjacent renewable energy markets as part of our corporate strategy of diversity growth.

Why Choose Us?

Rich experience

Founded in 1988, Chifeng Electric has evolved to be a competitive fuse brand in China with well-established and growing platforms in circuit protection technologies.

Complete range of products

Photovoltaic Fuses, ESS Fuses, High speed Fuses, Semiconductor Fuses, IEC Fuses, UL Fuses.

Advanced equipment

Electrical characteristics testing machines, Environmental tolerance test machines, Automatic fuse element stamping machines, Automatic fuse assemble machines, Automatic printing machine etc.

High quality service

5000 square meters workshop, 100 professional employees and 30 years of innovation and unwavering commitment to customer service enable us to provide objective, comprehensive, and personalized customer solutions for circuit protection.

What Are NH Fuses

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.

Characteristics of NH Fuse

● Current Rating: It is defined as the continuous conduction of maximum current holded by the fuse without melting. It is the capacity of current, and is measured in Amperes. Current (Cin)=75% current (rating)
● Voltage Rating: If voltage is connected in series with the fuse, it does not increase voltage rating.
V (Fuse) >V (open circuit)
● I2T Rating: It is the total energy which is carried by the fuse element in case of a short circuit. It measures the heat energy of the fuse, and is generated when the fuse breaks out.
● Interrupting or Breaking Capacity: The maximum rating of current without harming the interruption by the Fuse is known as interrupting capacity of the Fuse.
Breaking capacity > maximum rated voltage
Breaking capacity < short circuit current
● Voltage Drop: The Fuse element melts whenever there is an excessive current in the circuit, and opens the circuit. Due to this, voltage drop and resistance change reduces.
● Temperature: The fuse melts when the operating temperature is higher and the current rating is lower.
The represents temperature vs current carrying capacity of a fuse. The current carrying capacity of a fuse is 100% when the temperature is 25°C (three lines meet at this point). After that the current carrying capacity decreases upto 82% at 65°C. This shows that increase in temperature decreases the current carrying capacity of a fuse.
NH fuses are proven to be helpful in safeguarding any Electrical appliance or household Circuits. Its features are:
● The melting points of NH fuses are very low, which is 200° C.
● Fuse wires are made of an alloy composed of 50% lead and 50% tin.
● The resistance of Fuse wires is so high that whenever its temperature rises and it reaches its melting point, it breaks the Current which passes through the Circuit.

Size of NH Fuse

Most types of NH fuses come in several different dimensions. Generally speaking, the bigger the fuse, the higher its voltage rating.
Sizing NH fuse must take both electrical and physical needs into account. The NH fuse's voltage rating must comfortably exceed your application's current level, or else it'll blow needlessly. However, it must also fit inside the assembly without crowding other components, which could lead to heat buildup and other performance issues.
You can start by calculating the maximum and minimum NH fuse ratings:
● Wattage / voltage = max fuse rating (amps)
● Max fuse rating x 1.25 = minimum fuse rating
● Don't use a "10% rule." Size the fuse based on safety first, and keep the value well above that of the expected load. Balance this against the internal dimensions of the fuse's intended home. Spec a fuse to the proper maximum load – one actually possible in real life – to avoid oversizing and overspending on installation.

Applications of NH Fuses

NH fuses find a wide range of applications across various industries and sectors. Some of the most common applications include:

Automotive systems

Protecting electrical components, such as lighting, radios, and electronic control units, in vehicles.

Consumer electronics

Safeguarding devices like computers, televisions, and home appliances from power surges and short circuits.

Industrial equipment

Ensuring the safety of machines, motors, and control systems in manufacturing plants and facilities.

Renewable energy systems

Protecting components in solar panels, wind turbines, and energy storage devices from electrical faults.

Selecting the Right NH Fuse

When selecting NH fuse, consider voltage rating, ampere rating, interrupting rating, time delay vs. non-time delay, time-current characteristics and codes and standards.

Voltage rating: The voltage rating is the maximum voltage at which a NH fuse is designed to operate safely. Typical low-voltage power NH fuse voltage ratings are 250 Vac and 600 Vac. When selecting a NH fuse, make sure its voltage rating is equal to or greater than the application voltage.

Ampere rating: NH fuse's ampere rating is its continuous current carrying capability tested in defined laboratory conditions. Typical low-voltage power NH fuses are available in ampere ratings from 0.1 A up to 6,000 A. Derating factors may apply if the ambient temperature is a value other than 77° F.

Interrupting rating: The interrupting rating is the maximum amount of current the NH fuse can safely interrupt. The NEC requires overcurrent protective devices to have an interrupting rating greater than the available fault current. Current-limiting power NH fuses, UL Class L, J, RK1, RK5, T or CC have interrupting ratings of 200 kA, suitable for 99.9% of today's applications. Avoid selecting UL Class H and K NH fuses, which have low interrupting ratings of 10 kA and 50 kA respectively.

Time-delay vs. non-time-delay: A time-delay NH fuse is capable of carrying an overcurrent of a specified magnitude for a minimum specified time without opening. A time-delay NH fuse must hold 500% of its current rating for a minimum of 10 seconds. Time-delay NH fuses were originally designed to coincide with motor starting characteristics and are recommended for transformer and motor branch circuit applications where start-up in-rush currents occur often. Non-time-delay NH fuses don't meet the specified product time requirements and are typically used for non-inductive loads such as lighting panels and metering centers.

Time-current characteristics: A time-current curve is a graphical representation of the NH fuse's melting characteristic. Time-current curves are used to evaluate NH fuse performance. The more current the NH fuse sees, the faster it opens. Average melting, minimum melting and total clearing time-current curves are available from all NH fuse manufacturers.

How to Know NH Fuse Is Blown

Either visually or with the help of a device called a continuity tester or ohmmeter, you can know whether NH fuse has blown.

Visual Testing

If the glass window on screw-in NH fuses is clear, you will be able to see whether the fusing element inside the box is severed. It may appear brown, cloudy, or black because of the melting fusing element.

Testing Device

With the help of devices such as ohmmeter and continuity testers, you can measure electrical resistance. For checking a screw-in NH fuse, keep one test lead to the end of the NH fuse and the other to the threaded side.

NH Fuse Facts

NH fuses prevent fires: NH fuses are made for the express purpose of giving their life for yours. They are the sacrificial lambs of the electronic world. When too much current passes through a NH fuse or breaker it interrupts the flow of electricity. Without this safeguard, electrical surges could cause overheating or even a fire.

NH fuses and breakers should be upgraded every 20 years: If your breaker box is older than 20 years, it may be time for an upgrade. Over time, energy use has changed. The demands placed on breaker boxes today are much greater, and an old system may not be able to handle it. If your breakers or NH fuses are constantly blowing or tripping, you may want to think about an upgrade. Generally if you have actual NH fuses, you have an electrical system that is over 50 years old. You may want to think about upgrading the entire system- including the wiring and outlets inside the house- for safety. An ounce of prevention is worth a pound of cure.

NH fuses blow for a reason: Find out what it is before you reset or replace. There is always a cause; it may be that you have overloaded the electrical system. If so, just turn off some electrical equipment and try again. Electric clothes dryers and ovens, heaters, air conditioners, vacuums and hair dryers are often the culprits of an overload. If there is any sign of an electrical fire- such as sparks, smoke, or burnt and melted wires- DO NOT reset the system. Call an electrician before restoring the power.

NH fuses need to match the current: The volts passing through the NH fuse or breaker should match the volts the NH fuse can take. If you have a NH fuse that is too small for the volts that are running through it, there is a possibility of arcing. If the NH fuse is too large, it may not blow when a surge occurs. Either way, the surge will continue into your electronic equipment and could cause a fire.

There are more NH fuses than you think: Before you go out to reset your NH fuse box, take a look around. What is off? What is still on? You may not have to go outside at all. In some homes an internal NH fuse is connected to the electrical outlets. If so, there will be a red reset button located between the sockets. If only one plug is affected by the outage, try pressing that red button. It takes a little force to get it all the way in, but it should click. Before you do that, make sure that whatever equipment caused the issue is unplugged, and never use anything metal to push the reset button.

What Are NH Fuse Bases

NH fuse bases offer a compact and simple solution for application of fuses as protective elements in low voltage applications and are characterized by galvanically silver plated contacts providing reliable and high performing contact characteristics.

Main Functions and Specifications of NH Fuse Bases

Fuse bases for NH fuse links are designed to provide a secure and reliable connection for NH fuse links in electrical systems. They offer the following key features and specifications:
Mounting Options

NH fuse bases can be easily mounted on DIN/EN rails or using screw fixing. This provides flexibility during installation, allowing them to be used in various types of electrical panels or enclosures.

Single-Phase or Three-Pole

NH fuse bases are available in both single-phase and three-pole configurations. Single-phase fuse bases are suitable for protecting single-phase electrical systems, while three-pole fuse bases are designed for use in three-phase systems or for protecting multiple circuits.

Connection Options

NH fuse bases offer multiple connection options, including screws, fixed nuts, or clamps. These options accommodate different wiring preferences or standards, ensuring compatibility with various installation requirements.

Accessories

NH fuse bases come with a wide range of accessories. These include contact covers, fuse link covers, partition walls, and other components that enhance safety and allow achieving an IP20 protection index. These accessories provide additional protection and organization within the fuse base assembly.

Multi-Pole Units

NH fuse bases can be used to create multi-pole units by utilizing connection accessories. This feature enables combining multiple fuse bases to protect multiple circuits or phases within a single assembly.

Material and Contacts

NH ST fuse bases are constructed using self-extinguishing materials, ensuring safety in case of a fault. The contacts of NH fuse bases are typically made of silver-plated copper, providing excellent electrical conductivity and resistance to corrosion.

Standards

NH fuse bases are manufactured according to IEC, EN, and DIN standards. This ensures compliance with international electrical safety and performance standards, guaranteeing their reliability and suitability for a wide range of applications.

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FAQ

Q: What are NH fuses?

A: 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.

Q: What is the rating of NH fuse?

A: NH fuses produced according to TS EN 60269 Standard have 6 – 1250 ampere rated current range. Fuses with a breaking capacity of up to 120 kA are produced in 6 sizes (NH00, NH0, NH1, NH2, NH3, NH4) in gL / gG working classes. NH fuse bases are produced with steatite or BMC body.

Q: How come NH fuses blow?

A: NH fuses may blow for several causes, including:
When a high-volume current travels via a low-resistance electrical route, a short circuit is created. Electric cables can be pierced by a nail or screw, allowing water to enter the input jack and resulting in a short circuit. They can burn metal, start fires in arches, harm wire insulation, and evaporate conductors since they are a thousand times stronger than the average current.

Q: How do you describe NH fuse?

A: NH fuse is a small, thin conductor designed to melt and separate into two pieces for the purpose of breaking a circuit in the event of excessive current. A circuit breaker is a specially designed switch that automatically opens to interrupt circuit current in the event of an overcurrent condition.

Q: What are two facts about NH fuse?

A: NH fuses prevent fires: Fuses are made for the express purpose of giving their life for yours.
NH fuses and breakers should be upgraded every 20 years: If your breaker box is older than 20 years, it may be time for an upgrade.
NH fuses blow for a reason: Find out what it is before you reset or replace.

Q: What are the components of NH fuse?

A: NH fuses are very simple components. Inside each is a thin metal strip or wire called a resistor that forms a link in an electrical circuit. A number of different metals are used to make resistors. Tinned copper wire is a popular choice.

Q: How to spec NH fuse?

A: First, you will need to determine the maximum fuse rating in amperages by applying this formula for calculation: P (Watts) ÷ V (Voltage) = I (Amps). Next, you will need to calculate the minimum fuse rating or amperage by multiplying that total (the maximum amperage rating) by 125%.

Q: How to know NH fuse is blown?

A: Either visually or with the help of a device called a continuity tester or ohmmeter, you can know whether NH fuse has blown.
1.Visual Testing: If the glass window on screw-in NH fuses is clear, you will be able to see whether the fusing element inside the box is severed. It may appear brown, cloudy, or black because of the melting fusing element.
2.Testing Device: With the help of devices such as ohmmeter and continuity testers, you can measure electrical resistance. For checking a screw-in NH fuse, keep one test lead to the end of the NH fuse and the other to the threaded side.

Q: What does R mean on NH fuse?

A: Class R ("R" for rejection) fuses are high performance, 1⁄10 to 600A units, 250V and 600V, having a high degree of current-limitation and a short-circuit interrupting rating of up to 300,000A (RMS symmetrical).

Q: What typically causes NH fuse to fail?

A: Faulty, degraded, or damaged wiring can cause the electrical fuse to blow. The issue is usually more common in older homes with outdated wiring. Property owners can find it hard to know the wiring condition as it remains hidden behind the walls.

Q: What is the science behind NH fuses?

A: The NH fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

Q: What are the various parameters considered in selecting NH fuse?

A: Normal operating current 2. Application voltage (AC or DC) 3. Ambient temperature 4. Overload current and length of time in which the fuse must open.

Q: What is the basic functional component of NH fuse?

A: NH fuse is a safety device that operates to provide protection against the overflow of current in an electrical circuit. An important component of an electrical fuse is a metal wire or strip that melts when excess current flows through it.

Q: Can NH fuse fall out?

A: If any of the fuses fall out or easily come loose then that may be a sign that the some of the panel's terminals may be damaged. A damaged terminal with a loose fuse may cause electrical problems such as sudden, intermittent power loss to certain accessories or lights.

Q: What are basic requirements of NH fuses?

A: The material for the NH fuse wire must be a conductor. It should have a low melting point, such that when excess current passes through it, it melts down and breaks the circuit, hence stopping the current.

Q: What determines NH fuse size?

A: The NH fuse size is determined by the fuse ampacity, which is the maximum current that the fuse can carry without melting or opening. The fuse ampacity should be higher than the normal operating current of the load, but lower than the maximum allowable current of the circuit.

Q: How are nh fuses rated?

A: Proper NH fuse selection relies on several characteristics related to its rating, including voltage and current. These factors and more are critical to choosing a fuse that will safely protect electrical equipment from overcurrent damage.

Q: What does gG mean on NH fuse?

A: GG is a general-purpose NH fuse that can cope with lower overload current faults but will clear high short circuit faults. They are not as fast operating as other fuses.

Q: What are NH fuse characteristics?

A: NH fuse is usually a short piece of wire. The fuse is made up of a material which has high resistivity and low melting point, so that it melts down due to overheating of the wire during high current flow. The thickness of the fuse wire is determined based on the amount of current flow in the circuit.

Q: What are NH fuse bases?

A: NH fuse bases offer a compact and simple solution for application of fuses as protective elements in low voltage applications and are characterized by galvanically silver plated contacts providing reliable and high performing contact characteristics.

Zhejiang Chifeng Electric Co., Ltd. is well-known as one of the leading nh fuse links and bases manufacturers and suppliers in China since 1988. If you're going to buy high quality nh fuse links and bases with low price, welcome to get pricelist from our factory. Customized orders are welcome.

3 15 a 250v fuse, fuse holder 15a, cylindrical fuse holders