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 The Polyswitch is a resettable fuse, think of it as a circuit breaker. Commonly known as a reset-able fuse, polyfuse or polyswitch) is a passive electronic component used to protect against over-current faults in electronic circuits
 
  1. They are very inexpensive   $3.50 - $6.00 for 20
  2. EBay is the source
  3. To order you need to know
    • Trip Current
    • Hold Current
    • Voltage rating
PolySwitch 0.5A   PolySwitch 2.5A PolySwitch 5A
  The 1/2 amp device is about 1/4 inch in diameter while the 5 amp unit is about 1/2 inch wide. Simply wire them in series with the load you intend to protect. 
   

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