Connecticut Elec/View-Pak Ubiz1515-B 15A 2 Single Pole Zinsco Replacement Circuit Breaker - Quantity 6 Zinsco, Replacement Circuit Breakers

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Price: $359.94    

Product Description

15A, 2 Single Pole, Zinsco Replacement Circuit Breaker 120/240V Half Size, 1/2" Per Pole, Bulk.

Connecticut Elec/View-Pak Ubiz1515-B 15A 2 Single Pole Zinsco Replacement Circuit Breaker - Quantity 6 Zinsco, Replacement Circuit Breakers Review

I purchased 6 copies of the UPIZ1515 or a total of 12 circuits. Of these, two circuits were defective -- the handle was stuck in the middle "tripped" position and so could not be moved to "off" or "on". Amazon replaced one conveniently on request, but that is not the point. At least it didn't fail dangerously.

This breaker is a Chinese replacement for discontinued Zinsco circuit breakers. I purchased them t the urging of a couple of fearmongering websites after a home inspector alerted me to Zinsco breaker's reputation for failing dangerously.

Being an engineer, I decided to test if the Connecticut Electric breakers actually work and if the 1965 era Zinsco breakers actually don't. I constructed a step-down transformer that could provide about 32 Amps continuously for the test.

I found that when exposed to about twice the rated current, CE breakers have a trip time of 11 to 528 seconds. The 528 was somewhat of an outlier, only two of 12 circuits had trip time of over 104 seconds. Except for the two outliers, this is largely in line with specifications published by Square D.

In contrast, the 48 year old Zinsco breakers all tripped between 12 and 23 seconds during the same test. The bus bars in my panel showed no signs of overheating as described by the fearmongerers.

Additionally, these breakers have an issue that ganging the handles together to make a 240 volt breaker does not work. When one handle moves to "tripped", it does not have sufficient force to move the adjacent handle to "off". So if you want to power a 240 volt load like an airconditioner, the UBIZ02 family of breakers which Connecticut Electric offers are better. My testing confirmed that one overloaded circuit shut off both channels.

I divide my recommendations between three types of Amazon customers.

>If your house has conduit (metallic sheathing) any you are merely expanding an existing panel with one or two breakers, in my opinion the risk of installing these breakers doesn't seem too bad.

>If your house has romex-like non-metallic sheathed cable, in my opinion the risk is worse.

>If you are like me and are contemplating replacing a whole panel full of Zinco breakers, this is probably a poor value. Currently manufactured equipment is much less expensive than this and in my opinion safer. Replacing the panel may be a better value.

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