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Question about 16V POLYFUSER Radial Leaded Resettable PTC

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trigo(at)mail.telepac.pt
Guest

Posted: Mon Jan 04, 2010 3:46 pm Post subject: Question about 16V POLYFUSER Radial Leaded Resettable PTC

Polyfuses only reset themselves IF the cause that made them to trip disappears.  

   

Carlos  

           

  

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Ron Quillin

 Sent: segunda-feira, 4 de Janeiro de 2010 4:28

 To: aeroelectric-list(at)matronics.com

 Subject: Re: AeroElectric-List: Question about 16V POLYFUSER Radial Leaded Resettable PTC Available at Digi-Key  

  

   

At 19:41 1/3/2010, you wrote:

 

 

   

Looks like one could use these instead of fuses or the traditional circuit breakers (for the average range of protection)

 

 But my question is do these trip the same as typical fuses ? I know they can reset but would it work like a fuse for time to trip or protection of the wire ?  



 Are we sure we want a device that can reset itself?

 Doesn't that pretty much violate the premise of not resetting a tripped breaker?

 http://www.littelfuse.com/design/literature/fuse-vs-ptc/resettable-ptcs.html    	  Quote: 	
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marcausman

Joined: 08 Feb 2007
Posts: 70

Posted: Mon Jan 04, 2010 6:28 pm Post subject: Re: Question about 16V POLYFUSER Radial Leaded Resettable

See AC 43.13, chapter 11 quoted below:



11-50. RESETTABLE CIRCUIT PROTECTION

DEVICES.

a. All resettable type circuit breakers

must open the circuit irrespective of the position

of the operating control when an overload

or circuit fault exists. Such circuit breakers are

referred to as “trip free.”

b. Automatic reset circuit breakers, that

automatically reset themselves periodically, are

not recommended as circuit protection devices

for aircraft.

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_________________
Marc Ausman
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