Fusible Resistors
(FRN, FKN, FSQ)Fusible Resistor Features Best of Both Worlds Preview
Designers of small power supplies and battery chargers for consumer products can benefit from a fusible resistor with superior lightning strike and pulse abilities in a cost effective package.
Token Electronics offers a combination resistor/fuses series of metal/carbon film fusbile resistor (FRN), wirewound fusbile resistor (FKN) and cement encased fusbile resistors (FSQ). Token offers fusbile FRN series a low-cost alternative to traditional solutions for applications that require surge protection.
The robust cement-coated wire-wound FSQ resistors and wirewound fusbile FKN resistors are ideal for power supply applications across the telecomms, military and industrial markets which require a replacement for carbon composition resistors within the circuit design.
As part of the Token input protection range, this resistor provides a key fusible solution and is completely customisable to suit the individual application design requirements. Key design engineers with a need for a robust resistor, will find the FRN, FKN and FSQ series are a multifaceted product, providing comparable pulse performance with added fusing capabilities.
Our custom solutions are designed to address your need for technical and economic success in a timely manner.
Contact us with your specific needs.
Features :
- Low Cost
- Low Noise
- Reduced numbers of parts used in circuits
- Products with Pb-free Terminations and RoHS compliant
Applications :
- Telecommunications
- Household appliances
- Inrush Pulse protection
- Lightning strike protection
- Input protection for small power supplies and battery chargers
Metal Film Fusible (FRN) - Specifications & Dimensions (Unit: mm)
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| Type | Rated Wattage | Dimension (mm) | Resistance Range | Dielectric Withstanding Voltage | |||||
| L ± 1.5 | D ± 1 | H ± 3 | d ± 0.05 | ||||||
| FRN | 1/4W 1/2W 1W 2W 3W |
6 6 9 11 15 |
2.3 2.3 3.0 4.0 5,0 |
26 26 26 26 35 |
0.40~0.50 0.50~0.55 0.50~0.55 0.75~0.80 0.75~0.80 |
0.22Ω~100KΩ 0.22Ω~100KΩ 0.22Ω~100KΩ 0.3Ω~100KΩ 0.3Ω~100KΩ |
300V 300V 350V 500V 500V |
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Wirewound Fusible (FKN) - Specifications & Dimensions (Unit: mm)
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| Type | Rated Wattage | Dimension (mm) | Resistance Range | Dielectric Withstanding Voltage | ||||
| L ± 1.5 | D ± 1 | H ± 3 | d ± 0.05 | |||||
| FKN | 1W 2W 3W 5W 6W |
9 11 15 17 24 |
4.5 5.0 5.5 6.5 8.5 |
26 26 35 35 38 |
0.50~0.55 0.75~0.80 0.75~0.80 0.75~0.80 0.75~0.80 |
0.1Ω~22Ω 0.1Ω~60Ω 0.1Ω~100Ω 0.2Ω~200Ω 0.3Ω~250Ω |
500V 500V 500V 500V 500V |
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Ceramic Cement Fusible (FSQ) - Specifications & Dimensions (Unit: mm)
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| Type | Rated Wattage | Dimension (mm) | Resistance Range | Dielectric Withstanding Voltage | |||||
| L ± 1.5 | H ± 0.5 | W ± 0.5 | H ± 3 | d ± 0.05 | |||||
| FSQ | 2W 3W 5W 7W 10W |
18 22 22 35 48 |
7 8 9 9 9 |
7 8 10 10 10 |
35 35 35 35 35 |
0.50~0.55 0.75~0.80 0.75~0.80 0.75~0.80 0.75~0.80 |
0.1Ω~22Ω 0.1Ω~120Ω 0.2Ω~120Ω 0.3Ω~250Ω 0.3Ω~500Ω |
1000V 1000V 1000V 1000V 1000V |
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FRN, FKN, FSQ - Electrical Characteristics
| Test Items | Condition | Spec. |
| Operating Temp. | -30°C~155°C | |
| Resistance Temp. Coeff. | -30°C~150°C | ± 200PPM / °C |
| Short Time Overload | 2 times of rated voltage for 5 sec. | ± 2 % |
| Temp. Cycle | -30°C~85°C for 5 cycles | ± 1 % |
| Load Life | 25°C on-off cycle 1,000 hrs. | ± 5 % |
| Moisture-Proof Load Life | 40°C 95°C RH on-off cycle 1,000 hrs. | ± 5 % |
| Solder Pot | 270°C for 3 sec. | ± 1 % |
| Incombustibility | 16 times of rated wattage for 5 min. | not flamed |
FRN, FKN, FSQ - Fusing Characteristics
| POWER WATTAGE | FUSING TIME |
| 16 × Rated Wattage | Within 2 min |
| 24 × Rated Wattage | Within 1 min |
| 32 × Rated Wattage | Within 30 sec. |
FRN, FKN, FSQ - Application Notes
For fusible resistors, unlike fuses, fusing performance is given in terms of power rather than current.
The power can be calculated:
Power = Amperes 2 × Ohms
Fusing Device Application Notes
- When using, it shall be made sure that the overload conditions at unusual moments lie within the fusing territory.
- Consult with Token in advance when overloaded higher than the rated voltage under an ordinary situation since such an overload may store up damages on resistors.
- Use at the maximum open-circuit voltage or lower as an arc phenomenon may arise when high voltage is applied again after fusing by an over current.
- Consult with us for the maximum open- circuit voltage because it varies with applications.
Fusible Resistors (FRN, FKN, FSQ) Order Codes
| FRN | 1/2W | 0.47R | J | TB | |||||||||||||||||||||||||||
| 1 | 2 | 3 | 4 | 5 | |||||||||||||||||||||||||||
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