Circuit Breaker Fusible Resistors (FRN, FKN, FSQ)
(FRN, FKN, FSQ) Fusible Resistors Circuit Breaker Introduction
As Circuit Breaker, Fusible Resistor features best of both electronic worlds.
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 Fusible resistor (FRN), wirewound fuse resistor (FKN) and cement encased fusing resistors (FSQ). Token offers Fusible FRN series a low-cost alternative to traditional solutions for applications that require surge protection.
The robust ceramic encased cement resistor (FSQ) and wirewound resistor (FKN) 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.
Download complete specification - Thin Film, Wirewound, Cement Fusible Resistors (FRN, FKN, FSQ).
- Products with Pb-free Terminations and RoHS compliant.
- Low Cos, Low Noise, Reduced numbers of parts used in circuits.
- Household appliances, Telecommunications, Lightning strike protection.
- Inrush Pulse protection, Input protection for small power supplies and battery chargers.
(FRN) Thin-Film Fusible Resistor - Specifications & Dimensions (Unit: mm)
Thin-Film Fusible Resistor (FRN) 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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(FKN) Fusible Wirewound Resistor - Specifications & Dimensions (Unit: mm)
Fusible Wirewound Resistorr (FKN) 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 |
(FSQ) Circuit Breaker Cement Resistor - Specifications & Dimensions (Unit: mm)
Circuit Breaker Cement Resistor (FSQ) 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 |
(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 of Fusible Resistors
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
- 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.
(FRN) Fusible Thin-Film Resistor - Order Codes
| FRN | 1/2W | 0.47R | J | TB | ||||||||||||||||||||||||||||||
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(FKN) Fusible Wirewound Resistors - Order Codes
| FKN | 2W | 0.47R | J | TB | ||||||||||||||||||||||||||||||
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(FSQ) Fusible Circuit Breaker Resistors - Order Codes
| FSQ | 5W | 0.47R | J | P | ||||||||||||||||||||||||||||
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