View Full Version : Difalco resettable fuse

02-16-2008, 07:05 PM
How many amps does the difalco resettable fuse handle before it blows and resetts

02-17-2008, 09:30 PM
This should be the info you want:

If this link does not work; click on the link below and then click on the "data sheet" link.

more info @

As you can see, it is not a real fuse but a semi conductor which is sensitive to heat. They make this in different sizes and I believe this is the one that is used in the controller. The numbers off the replacement protect match this part as near as I can figure out.

02-18-2008, 11:26 AM
Here's something that will help you interpret the data for PTCs.

The trip point is the current which the PTC is guaranteed to open up at.

The hold point is the current which the PTC is guaranteed to be able to conduct without opening up.

For currents in-between those two values, the PTC may open or close.

PTC trip and hold points are dependent on the temperature of the surrounding air, but in controller handles you can pretty much count on the trip and hold points given for room temperature (20 to 25 degrees C).

02-18-2008, 05:14 PM
AND if it trips too many times, it has a resistance bias. This means you may not have full brakes when you really need them that a real fuse will guarantee.