All you should know about RK5 Fuse
What Are the Specific Classifications of Industrial Fuses
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 |
What is a Dual-element Design?
The “dual-element” design is a special design for RK5 Fuses aimed at providing better overload protection. Dual-element fuses typically contain two fuse elements: a time-delay element and an instantaneous action element:
Time-delay Element:
Also known as a thermal element, it is used to handle short-duration over-currents. It has a certain time delay, allowing transient overloads in the circuit to pass through to prevent unnecessary tripping, which is crucial for handling momentary load fluctuations.
Instantaneous Action Element:
Also known as a magnetic element, it is used to handle larger over- This element can respond quickly and rapidly disconnect the circuit to prevent damage from significant overloads.
By combining both the time-delay and instantaneous action elements, dual-element fuses can handle instantaneous overloads in a short time while retaining a certain time delay to accommodate specific transient overload situations.
This makes RK5 fuses more suitable for certain circuits and equipment, providing comprehensive over-current protection.
What Are the Characteristics of Over-Current Protection of High-Performance Current-Limiting Fuses?
High-performance current-limiting fuses provide reliable protection against over-current effects, featuring the following characteristics:
- High Breaking Capacity:The breaking current capacity reaches 10~200kA, with some products exceeding 500kA.
- Can limit the short-circuit energy and peak current through the fuse branch to extremely low levels.
- Fast Short-Circuit Breaking Speed (in milliseconds, potentially below 1ms):
- High Reliability, Long Life, High Stability: The over-current protection capability remains unchanged for decades without the need for adjustment.
- Compact Size, Low Cost
- Convenient replacement of current specifications, current expansion or reduction. The same size series can have many current specifications.
- Due to low requirements for operating conditions and good adaptability, fuses can be easily coordinated with other electrical components. Through the standardization of characteristic parameters, fuses are easy to use in conjunction with other devices.
What’s the Difference Between RK5 Fuse, And Regular Fuse?
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.
What Should I Pay Attention to When Using RK5 Fuse?
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.