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Add:Yongli Road NO.6, Guodian, Yanguan Town, Haining City, Zhejiang 314412 China
Tel:+86-573-87297683 87179527
Fax:+86-573-87297683
Http://www.hn-yongli.com
Sales and Service:
ptc@hn-yongli.com
Technical Supports:
yl@hn-yongli.com |
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 Products |
| PTC Over current Protection |
1. Application Principle
Ceramic PTC thermistors are used instead of conventional fuses to protect loads such as motors, transformers, etc. or electronic circuits against overcurrent. They not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded. Thermistor fuses limit the power dissipation of the overall circuit by increasing their resistance and thus reducing the current to a harmless residual value. In contrast to conventional fuses, they do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time.
As opposed to PTC thermistors made of plastic materials, ceramic PTC thermistors always return to their initial resistance value, even after frequent heating/cooling cycles.
2. Application Examples for PTC Overcurrent Protectors
| ·Telephone Line Fault Protection |
·Transformer Protection |
| ·FHP Protection |
·Transistor Protection |
| ·Speaker Protection |
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3. Advantages
| ·Fast Switching |
·No ElectricalNoise |
| ·Virtually Unlimited Life |
·Self Resetting |
| ·Automatic Operation |
·Efficient |
4. Product Profiles
 
5. Technical Data
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Type
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Technical Parameters
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Dimension (mm)
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Notes
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Rating Resistance
At 25℃(Ω)
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Max. Operating Voltage
(V)
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Max. Continuous Current at
40℃ (mA)
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Maximum Response Time(s)
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Resetting Time
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3A-0.5A
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1A-0.5A
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0.5A-0.15A
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18±20%
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250
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110
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0.40
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1.40
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10.0
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≤60
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Φ6.2×1.3
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25±20%
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300
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90
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0.35
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0.80
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4.0
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≤60
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Φ6.2×1.3
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40±20%
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300
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60
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0.30
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0.60
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3.0
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≤60
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Φ6.2×1.3
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50±20%
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300
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60
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0.20
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0.60
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3.0
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≤60
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Φ6.2×1.3
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18±20%
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250
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110
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0.40
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1.40
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10.0
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≤60
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Φ7.0×1.3
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18±20%
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250
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110
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0.40
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1.40
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10.0
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≤60
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8.2×8.2×1.4
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10±20%
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250
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130
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0.45
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3.0
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20.0
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≤60
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Φ8.0×1.4
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18±20%
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250
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110
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0.40
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1.40
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10.0
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≤60
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Φ8.0×1.4
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30±20%
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600
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90
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0.35
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1.20
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10.0
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≤60
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Φ8.0×1.4
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39±20%
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650
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70
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0.30
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0.75
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6.0
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≤60
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Φ8.0×1.4
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50±20%
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650
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60
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0.10
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0.65
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3.0
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≤60
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Φ8.0×1.4
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55±20%
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650
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60
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0.10
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0.65
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3.0
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≤45
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Φ8.0×1.4
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