SQF Soojus Kaitsme Tsement Takontid Funktsioonid: 1 See on sobivad jaoks kaitsmsissee voolursisseg lauad. 2 Tuleksissedel Ehitus sisse a keraamiline juhtum, resontant kuni niiskus ja sissesulation. 3 Sisse kõrge resontance väärtus, the wsissedsisseg südamikud tahe ole asendatud kõrval vägi film südamikud. 4 Suurepärane ülepinge characterontics ja täpne paindlikkus.
SQF Thermal Fuse Cement Resistors
Products |
SQF Thermal Fuse Cement Resistors |
Features |
1. It is suitable for protecting circuit boards. 2. Flameproof construction in a ceramic case, resistant to humidity and insulation. 3. In high resistance value, the winding cores will be replaced by power film cores. 4. Excellent anti-surge characteristics and accurate fusibility. |
Electrical And Mechanical Performance:
Characteristics |
Standards |
Test Methods |
Resistance Tolerance |
±5%(J) |
- |
Resistance Temp. Coeff. |
±300 ppm/°C; <1Ω:±600ppm/°C |
- |
Power Rating Load |
Surface temp.130°C Max.ΔR/R≤±1% |
Rated voltage for 30 minutes |
Short Time Overioad |
±2% |
10 times of rated wattage for 5 seconds.
|
Dielectric Withstanding Voltage |
No evidence of mechanical damage or insulation breakdown.
|
AC 1000V for 1 minutes.
|
Insulation Resistance |
10,00MΩ |
DC 500V megger
|
Terminal Strength
|
No evidence of mechanical damage.
|
4.5 kg
|
Solder-ability |
Minimum95%coverage |
235 ± 5°C for 2 seconds |
Resistance to Soldering Heat |
No evidence of mechanical damage.ΔR/R≤±1% |
265±5°C for 10 ±1 seconds
|
Environmental Characteristics:
Characteristics |
Standards |
Test Methods |
Temp. Cycle |
△R/R≤±1% |
-25°C ( 1 hrs.)—► Room Temp.( 2 hrs.) —►+Operating temp.( 1 hrs.) —►Room Temp.( 2 hrs.) / ( 5 cycles) |
Load Life |
△R/R≤±5% |
Rated power load 90 minutes ON 30 minutes OFF 70°C 1000 hours |
Moisture-proof Load Life |
△R/R≤±5% |
Rated power load 90 minutes ON 30 minutes OFF 40°C95%RH500 hours |
Nonflammability
|
not flamed
|
16 times of rated wattage for 5 min.
|
Dimensions:
Rated Wattage |
W±1 |
S±1 |
H±1.5 |
P+2/-1 |
d1 ±0.1 |
d2±0.1 |
Resistance Range (Ω) |
SQF3 |
12 |
8 |
25 |
5 |
0.8 |
2A:0.6 3A:0.6 5A:1.0 10A:1.0 |
0.1~50K |
SQF5 |
13 |
9 |
25 |
5 |
0.8 |
0.1~50K |
|
SQF7 |
13 |
9 |
39 |
5 |
0.8 |
0.1~50K |
|
SQF10S |
16 |
12 |
35 |
7.5 |
0.8 |
0.1~50K |
|
SQF10 |
20Max. |
9 |
25Max. |
12.5 |
0.8 |
0.8 |
0.1-50K |
Ratings:
Rated Current |
Rated Functioning Temperature |
Rated Wattage |
||||
SQF3 |
SQF5 |
SQF7 |
SQF10 |
SQF10S |
||
3A |
145°C |
1.6W |
1.6W |
2.2W |
3.2W |
2.5W |
5A |
145°C |
1.6W |
1.6W |
2.2W |
3.2W |
2.5W |
10A |
132°C |
1.6W |
1.6W |
2.2W |
3.2W |
2.5W |
10A |
185°C |
2.1W |
2.1W |
2.4W |
4.2W |
3.5W |
Derating Curve :
For resistors operated in ambient temperatures above 25°C , power rating must be derated in accordance with the curve below.