Difference between SMD fuse and a polyswitch?

[iADC]

If both Polyswitch and fuse are used for over current protection, what is their main advantages and disadvantages?

If my system is powered by a industrial switch mode PSU. do I need overvoltage protection.


Thanks!


http://catalog.tycoelectronics.com/TE/bin/TE.Menu?M=MENU&ID=12653&BML=10576,16366&LG=1&I=13

 

[IanP]

Standard fuse when it is blown it is blown and has to be replaced ..
The PolySwitch device, however, resets after the fault is cleared and power to the circuit is removed ..

It is always a good idea to have overvoltage protection, especially in industrial applications ..

Regards,
IanP

 

[iADC]

How should I chose a correct rating of a over-current polyswitch?
What should I consider?


and also rating for a over voltage protection
What should be the considering factors?

 

[IanP]

"How to Select a PolySwitch Device"
http://www.circuitprotection.com/selection/select-polyswitch.asp

Overvoltage protection level can be selected according to data sheets of components used in a circuit you are trying to protect ..
For example, microcontrollers usually work with Vcc=5V, but they are rated to ≈6.5V (or more), so the overvoltage circuit should trip just below that value ..

Regards,
IanP

 

[iADC]

Thanks! Understood...


Regards,
Andy