On 22 Dec 2006 07:49:05 -0800, wrote:

How old are these breakers?
Breakers older than a certain age are going to be questionable
irregardless of the make.

imho:

From what I heard about Zinsco's, the problem isn't the breakers, but
the panel's bus bars. So a new service panel could be the course of
action. Get a professional to evaluate the condition of the panel.

later,

tom @ www.freecreditcheckguide.com