http://i819.photobucket.com/albums/zz111/lacogada/TestBreaker_zps5b909db7.jpg (http://s819.photobucket.com/user/lacogada/media/TestBreaker_zps5b909db7.jpg.html)

The above breaker (#28) feeds front porch and back porch receptacle.
Standard receptacles with exterior cover plates.

Seldom use the one on front porch but back is used often mainly for a leaf blower.
It has worked fine until the last week or so. When it first tripped, I just put it back on and it worked.

I can no longer turn it on... it immediately trips.
Approx 30 to 35 years old.

Advice please.

If there is no problem in the circut. You might want to think about an upgrade and replace it with a GFI breaker. Since both recepticles are outdoors then it will prevent shock hazzard. Also if you live in a part of the U.S. where extreme cold has been it is possible you have water trapped in a receptical that is causing a problem.

Thanks for the reply.

I thought that was a GFI breaker.

I live in south Louisiana, though we did see 23deg in the past week or so, and it has been a fairly cold winter so far, we rarely go below freezing.

That is a GFCI breaker. First remove any devices that may be plugged into the circuit. If the breaker will not reset, it may be defective or you may have moisture in one of the receptacle boxes. Remove outlet covers and dry with hair dryer. If that does not correct the problem the breaker is probably defective.

PS
If you have a garage, that breaker probably serves the garage also.

Thanks for the advice Harold, will try it.

It worked... thanks Harold.

Thanks for the feed back. Check to insure that outlet covers are tight and closed so you don't have a repeat.