From our local community comes this advertisement:
For those that are not familiar with the brand, Zinsco is abject crap.
The company is a joke among electricians and anyone getting into a house with a Zinsco panel needs to have it replaced immediately with something better - Square-D is good and not that much more expensive.
I never dealt with Zinsco. Down here it was 'Federal Pacific', or among electrical folk, "F**king Pathetic", and they didn't just sell misery to the low-voltage crowd, they made medium and high voltage gear that was equally sad.
MC