Zinsco circuit breakers

pishta said
Are these a time bomb ready to cause a fire? Recall material? Panel is GTE/Sylvania circa 1954 and I keep tripping a 20A with the portable A/C on and a few other things on that circuit. I'm not ready to drop a G on a new panel but maybe there is an updated breaker that fits this 'plug in' model? I used to deliver this stuff and there were 10s of breaker manufacturers that made compatible breakers. looks like this, breaker probably looks like this

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pull the breaker thats tripping look at the bus bar its attached to may be burning up quite common with those panels and also look at the breaker where it plugs onto bus bar