With excellent reliability and breaking capacity, #HCNR series Class RK5 fuses can be used in circuits withstanding temporary motor overloads and surge currents.
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With over 20 years of experience and more than 500 satisfied customers across 50+ countries, HIITIO is your trusted partner for high-voltage DC solutions in electric vehicles, solar energy systems, energy storage applications, and more.
As a prominent electrical components manufacturer, HIITIO specializes in high-voltage DC applications. We hold prestigious certifications, including ISO9001, ISO14001, ISO45001, and IATF16949, attesting to our commitment to quality, environmental responsibility, occupational health and safety, and automotive industry standards. There are four series of fuses designed to ensure the safety of power systems.
The Class RK5 fuse, is a current-limiting time-delay fuse with an interrupting current rating of at least 200,000 amps, designed to protect circuits from overload and short circuits. The rated current is usually 1- 60amps, voltage up to 250VAC and 150VDC, these time-delay fuses withstand current overload for a short time so they won’t open when exposed to harmless temporary surges.
| Brand | Bussmann | Edison | HIITIO | Liitelfuse | Mersen |
| Series | FRN-R | ECNR | HCNR | FLNR | TR-R |
| Certification | UL,CSA,CE | UL,CSA,CE | UL | UL,CSA | UL,CSA |
| Rated Voltage | 250Vac/125Vdc | 250Vac/125Vdc | 250Vac/150Vdc | 250Vac/125Vdc | 250VAC; 250VDC (0.1-2.8A; 35-400A); 160VDC (3-30A; 450-600A) |
| Rated Current | 1⁄10-60A | 1-60A | 10-60A | 1⁄10-600A | 1⁄10-600A |
| Breaking Capacity | 200kA Vac RMS Sym. 20kA Vdc |
200kA RMS Sym. | 200kA Vac RMS Sym. 50kA Vdc |
200kA Vac RMS Sym.；300 kA Vac RMS Sym.(Littelfuse self-certified) 20kA Vdc |
200kA I.R. AC 1/10-60A: 20kA I.R. DC 70-600A: 100kA I.R. DC |
| Size (Up to 30A) | 50.8mm*14.22mm | 50.8mm*14.22mm | 50.8mm*14.3mm | 50.8mm*14.3mm | 51mm*14mm |
| Size (35 to 60A) | 76.2mm*20.57mm | 76.2mm*20.57mm | 76.2mm*20.7mm | 76.2mm*20.7mm | 76mm*21mm |
HIITIO class RK5 fuse has been successfully issued UL JDDZ certification, which is a significant achievement. It’s noteworthy that HIITIO stands out as the sole manufacturer in China at present to be certified by UL, reinforcing our commitment to quality and safety.
HIITIO class RK5 fuse breaking capacity is up to 200kA, during normal operation, it can withstand high current and maintain the normal operation of the circuit. The overload element provides protection against low level over-current of overloads and will hold an overload which is five times greater than the amp rating of the fuse for a minimum of ten seconds.
It provides equally excellent overload protection for motors and low peak current fuses for other types of loads and circuits, addressing temporary surges such as those caused by currents from transformers and inductors. (In this circuit, current-limiting fuses are only capable of offering short-circuit protection.)
Optimized supply chain, establishing close ties with reliable suppliers. Plan procurement, manage inventory. Optimized supplier delivery structures
4 semi-automatic production lines and 1 fully automated production line to further enhance productivity and quality control
Distinguished certifications such as ISO9001, ISO14001, ISO45001, and IATF16949, underscoring our steadfast dedication to upholding the highest standards
UL, cUL, CSA, CE, CB, TUV, SEMKO, CCC, VDE, and more. Actively researching customer needs and industry trends, seeking additional certifications.
Independent laboratory for electrical life testing, breaking capacity testing, high and low temperature testing, etc. 30+ people R&D team with 10+ years developing experience
Pre-sales Services: product consultation, technical support, customized solutions, sample service, and fast delivery.
After-sales Services: Respond to your questions and complaints in a timely manner and provide the best solution.
According to UL248 and CSA C22.2 No. 248, industrial fuses can be divided into the following categories:
| Fuse Type | Voltage Rating (AC) | Max. Current Rating | Classification | Time-Delay Requirements | UL Standard |
|---|---|---|---|---|---|
| Class C | 600VAC DC Optional |
1200A | Non-renewable Time-delay |
Undefined | UL248-2 |
| Class CC | 600VAC DC Optional |
30A | Non-renewable Current limiting Fast-acting |
12s@2X | UL248-4 |
| Class G | 480/600VAC DC Optional |
21A/60A |
Non-renewable -Current limiting -Time-delay |
12s@2X | UL248-5 |
| Class H (Non-Renewable) |
250/600VAC DC Optional |
600A | Current limiting Time Delay |
10s@5X | UL248-6 |
| Class H (Renewable) |
Current limiting Fast Aciting |
UL248-7 | |||
| Class J | 600VAC DC Optional |
600A | Non-renewable -Current limiting -Fast acting |
10s@5X | UL248-8 |
| Class K | 250/600VAC DC Optional |
600A | Current limiting -Fast acting |
10s@5X | UL248-9 |
| Class L | 600VAC DC Optional |
601A-6000A | Current limiting Bolt-in Time-delay |
Undefined | UL248-10 |
| Class RK1 | 250/600VAC DC Optional |
600A | Current limiting Time Delay |
10s@5X | UL248-12 |
| Class RK5 | 250/600VAC DC Optional |
600A | Current limiting Time Delay |
10s@5X | |
| Class T | 300/600VAC DC Optional |
1200A | Very Current Limiting Time-delay Fast-Acting |
10s@5X | UL248-15 |
High-performance current-limiting fuses provide reliable protection against over-current effects, featuring the following characteristics:
Unlike ordinary fuses, RK5 grade fuses use high melting point alloy materials that quickly melt and open the circuit when high temperature is detected. These materials also have low short-circuit resistance, which allows them to quickly cut off short-circuit current and protect circuits from damage.
In addition, RK5 fuses can quickly cut off the circuit with high breaking capacity. They are usually used in some circuits that require short-term over-current protection, such as over-current when starting a motor. Regular fuses may have lower breaking capabilities and have a wider range of applications including protection of a variety of loads and electrical equipment.
Class RK5 fuses have a time delay function, so they should not be used in circuits where the fuse will be energized for a long time, as this may exceed the fuse’s blowing time and may affect the safety and reliability of the circuit.
RK5 fuse can be used to protect the motor, especially when the motor is started, transient over-current may occur. RK5 fuse can quickly cut off the circuit to prevent damage to the motor. The time delay feature safely handles harmless starting and inrush currents associated with the motor.
In a UPS system, transient over-current conditions may occur, such as when starting the UPS or when the grid voltage fluctuates. The RK5 fuse is a fast-breaking protection device, suitable for quickly cutting off over-current in the circuit, and can help prevent these over-currents from causing damage to the UPS system.
RK5 fuses can be employed in branch circuits to protect downstream components and equipment, providing protection against over-current, ensuring that power supply equipment and connected equipment are well protected from over-currents. This includes protection for lighting circuits, power outlets, and other branch circuits in residential, commercial, and industrial settings.
Yes, we have customers in the United States and Europe. For more information, please contact us.
Yes, we have a distributor policy. Warmly welcome you to discuss with us.
Sure, we can provide free samples after evaluation.
When there is inventory, the delivery time is within a week If there is no inventory, the delivery time is subject to order and will be as early as possible.
Yes, OEM and ODM are available.
HIITIO® was established in 2018 as a result of Hecheng Electric introducing a mature R&D team. HIITIO specializes in producing high-voltage DC electrical devices for EV, solar energy systems, and energy storage applications.
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