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3402.0006.22 参数 Datasheet PDF下载

3402.0006.22图片预览
型号: 3402.0006.22
PDF下载: 下载PDF文件 查看货源
内容描述: 保险丝\n [Fuse ]
分类和应用: 电路保护
文件页数/大小: 65 页 / 2556 K
品牌: ETC [ ETC ]
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HOW POLYMERIC RESETTABLE  
OVERCURRENT PROTECTORS WORK  
The conductive carbon black filler material in the  
polymeric device is dispersed in a polymer that has a  
crystalline structure. The crystalline structure densely  
packs the carbon particles into its crystalline  
boundary so they are close enough  
S
T
350  
RA090  
together to allow current to flow  
through the polymer insulator  
via these carbon Òchains.Ó  
RA075  
When the conductive  
plastic material is  
RA060  
at normal room  
temperature, there  
RA600  
are numerous carbon  
chains forming conductive  
paths through the material.  
RA400  
Under fault conditions, excessive current flows through  
2
the polymeric device. I R heating causes the conductive  
RA300  
plastic materialÕs temperature to rise. As this self heating  
continues, the materialÕs temperature continues to  
rise until it exceeds its phase transformation  
temperature. As the material passes through this  
phase transformation temperature, the densely packed  
crystalline polymer matrix changes to an  
amorphous structure. This phase change is  
accompanied by a small expansion. As the  
conductive particles move apart from each other, most of  
them no longer conduct current and the resistance of the  
device increases sharply.  
RESETTABLE CIRCUIT PROTECTION  
When it comes to Polymeric Positive Temperature  
Coefficient (PPTC) circuit protection, you now have a  
choice. If you need a reliable source, look to polymeric  
resettable fuses from SCHURTER.  
The material will stay Òhot,Ó remaining in this high  
resistance state as long as the power is applied. The  
device will remain latched, providing continuous  
protection, until the fault is cleared and the power is  
removed. Reversing the phase transformation allows the  
carbon chains to re-form as the polymer re-crystallizes.  
The resistance quickly returns to its original value.  
Polymeric fuses are made from a conductive plastic  
formed into thin sheets, with electrodes attached to either  
side. The conductive plastic is manufactured from a non-  
conductive crystalline polymer and a highly conductive  
carbon black. The electrodes ensure even distribution of  
power through the device, and provide a surface for leads  
to be attached or for custom mounting.  
107  
106  
105  
104  
103  
102  
101  
100  
The phenomenon that allows conductive plastic materials  
to be used for resettable overcurrent protection devices is  
that they exhibit a very large non-linear Positive  
Temperature Coefficient (PTC) effect when heated. PTC  
is a characteristic that many materials exhibit whereby  
resistance increases with temperature. What makes the  
polymeric conductive plastic material unique is the  
magnitude of its resistance increase. At a specific  
transition temperature, the increase in resistance is so  
great that it is typically expressed on a log scale.  
0
20  
40  
60  
80  
100  
120  
140  
TEMPERATURE °C  
104  
Schurter, Inc. ¥ Phone 707-778-6311 ¥ Fax 707-778-6401 ¥ E-mail info@schurter.com ¥ Website http://www.schurter.com