F7K series Thermal-Links/Resistor Assemblies

  • Thermal-Links/Resistor Assemblies is a product that combined with thermal-links of fusible alloy type and 7W wire wound resistor type.
  • F7K is RoHS compliance product, non-Pb and non-Cd contains.
  • F7K got excellent interception characteristic when abnormality overload happened.
  • Especially, F7K adopted excellent characteristic resistive element against the In-rush current, and it is the best for preventing In-rush current.
  • In-rush Resistance Characteristics

In-rush Resistance Characteristics-Graph
In-rush Resistance Characteristics-Test circuit・Switching time

Dimension

Dimension
Unit : mm
A 5±0.5
B 3.5＋1、-0.5
C 30±0.5
D 15±0.5
E 11±0.5
F Φ0.80±0.04
G Φ1.00±0.04

Construction

Construction
1 Ceramic case
2 Silicone cement
3 Resistance
(Ceramic insulator)
4 Thermal-Links
5 Lead wire
(Tin plated copper wire)

Models Component

Models Component

Ratings

Model name F7KNominal resistance valueJ13 F7KNominal resistance valueJ14
Rated power(25°C) 3.0W 3.5W
Nominal resistance value 1.8～820Ω※1 1.8～820Ω※1
Resistance tolerance ±5%
Thermal-Links Model name L5F L7F
Rated functioning temp.Tf 136°C 145°C
Rated voltage AC250V AC250V
Rated current 5A 5A
UL C-UL ○ ○
TUV ○ ○

※Nominal resistance value : Nominal Resistance Code　Please refer to page3 the selection list for the detail resistors.

Derating Curve

Derating Curve

Interception Time vs. Wattage

Interception Time vs. Wattage
Interception time - max. sec.
T4 T9 T16 T25
1 hour or less 90 55 40

Interception Characteristic

F7KNominal resistance valueJ13

Interception Characteristic

Approved Standard For Safety

F7KNominal resistance valueJ13

Model name UL、C-UL TUV
F7K1R8J13 E73591 R50079683
F7K2R2J13 E73591 R50079683
F7K3R3J13 E73591 R50079683
F7K3R9J13 E73591 R50079683
F7K4R7J13 E73591 R50079683
F7K5R1J13 E73591 R50079683
F7K5R6J13 E73591 R50079683
F7K6R8J13 E73591 R50079683
F7K8R2J13 E73591 R50079683
F7K100J13 E73591 R50079683
F7K120J13 E73591 R50079683
F7K150J13 E73591 R50079683
F7K220J13 E73591 R50079683
F7K330J13 E73591 R50079683
F7K390J13 E73591 R50079683
F7K470J13 E73591 R50079683

F7KNominal resistance valueJ14

Model name UL、C-UL TUV
F7K1R8J14 E73591 J50052171
F7K2R2J14 E73591 J50052171
F7K3R3J14 E73591 J50052171
F7K3R9J14 E73591 J50052171
F7K4R7J14 E73591 J50052171
F7K5R1J14 E73591 J50052171
F7K5R6J14 E73591 J50052171
F7K6R8J14 E73591 J50052171
F7K8R2J14 E73591 J50052171
F7K100J14 E73591 J50052171
F7K120J14 E73591 J50052171
F7K150J14 E73591 J50052171
F7K220J14 E73591 J50052171
F7K330J14 E73591 J50052171
F7K390J14 E73591 J50052171
F7K470J14 E73591 J50052171

The status of safety standards approval are the latest one as of February 1st, 2009. If you have any concerns of these coditions,please feel free to contact us to get more details information.

Performance standard

The following qualities will be examined, and we be offering the product that past a safety standard.

Resistance value

Specifications
Resistance shall be within ±5% of nominal resistance value.
Test Methods
The following DC voltage is applied across lead terminals for measurements.
Nominal resistance range[Ω] Max. applied Volt.[V]
1 and over less than 10 0.3
10 and over less than 100 1

Functioning temperature

Specifications
F7KNominal resistance valueJ13 : 136+0-7°C
F7KNominal resistance valueJ14 : 145+0-7°C
Test Methods
Soaking the product in the oil bath of temperature rising at 0.5/per min.
Then measure the temperature of oil.
The measure begining temperature is -20°C of rated functioning temperature, and the detection current is assumed to be 10mA or less.

Insulation resistance

Specifications
Between body and lead terminals　
Insulation resistance shall be 1000MΩ or above.
Between both lead terminals　
Insulation resistance shall be 0.2MΩ or above.
Test Methods

Between body and lead terminals DC500V is impressed and measured between metallic foil wrapped on the case, and lead terminals.
Between both lead terminals DC500V is impressed for and measured between lead terminals after functioning temperature test.

Dielectric strength

Specifications
Between body and lead terminals　
The products shall withstand for 1minute.
Between both lead terminals　
The products shall withstand for 1minute.
Test Methods

Between body and lead terminals AC1.5kV is impressed for 1 minute and measured between metallic foil wrapped on the case, and lead terminals. (Cutoff current 0.5mA)
Between both lead terminals AC500V is impressed for 1 minute and measured between lead terminals after functioning temperature test. (Cutoff current 0.5mA)

Temperature coefficient of resistance

Specifications
±250ppm/°C
Test Methods
Room temperature/70°C up

Short time overload

Specifications
±(2%+0.05Ω)
Test Methods
Rated power×10, for 5 sec.

Soldering heatproof

Specifications
±(1%+0.05Ω)
Test Methods
265°C±5°C, 10 sec.

Terminal strength

Specifications
No mechanical damages
Test Methods
Pull 20N, 1 min
Bending 90°C 1 cycle

Humidity resistance

Specifications
±(2%+0.05Ω)
Test Methods
40°C, Humidity 90～95%RH, 10000h

Load life

Specifications
±(3%+0.05Ω)
Test Methods
Rating load 1000h, 1.5h ON/0.5h OFF cycle