Fusible Resistors (FRN, FKN, FSQ)

Fusible resistor features best of both 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.

Direct Electronics offers a combination resistor/fuses series of metal/carbon film Fusible resistor (FRN), wirewound fuse resistor (FKN) and cement encased fusing resistors (FSQ). Direct 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 Direct 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 PDF Fusible Resistors (FRN, FKN, FSQ).

Features :
  1. Low Cost
  2. Low Noise
  3. Reduced numbers of parts used in circuits
  4. Products with Pb-free Terminations and RoHS compliant
Applications :
  1. Telecommunications
  2. Household appliances
  3. Inrush Pulse protection
  4. Lightning strike protection
  5. Input protection for small power supplies and battery chargers
Specifications & Dimensions (Unit: mm) Thin-Film Fusible Resistor (FRN)
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
Specifications & Dimensions (Unit: mm) Wirewound Fuse Resistor (FKN)
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
Specifications & Dimensions (Unit: mm) Cement Fusing Resistor (FSQ)
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
Electrical Characteristics (FRN, FKN, FSQ)
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

Fusing Characteristics (FRN, FKN, FSQ)
POWER WATTAGE FUSING TIME
16 X Rated Wattage Within 2 min
24 X Rated Wattage Within 1 min
32 X Rated Wattage Within 30 sec.
Order Codes (FRN, FKN, FSQ)
FRN 1/2W 0.47R J TB
Type
FRN
FKN
FSQ
Power Rating
(W)
Resistance Value
(Ω)
R47 0.47Ω
47R 47Ω
470R 470Ω
4K7 4.7KΩ
47K 47KΩ
Resistance Tolerance
(%)
J ±5%
Package
P Bulk
TB Taping Box