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Connecticut Electric 40-Amp 2-Pole Standard Trip Plug-On Neutral Circuit Breaker

12 Reviews
  • Zinsco Replacement Circuit Breaker : RC3840
  • 2 Pole breaker in 3/4 in body thin series
  • Intertek ETL Listing to UL Standard 489 for US and Canada -Molded case circuit breakers


Zinsco circuit breaker by Connecticut Electric Type UBIZ. For use in Zinsco load centers that accept type RC circuit breakers. ETL Listed. 10,000 AIC 2-pole 40A clamshell packaged.
  • Zinsco Replacement Circuit Breaker : RC3840
  • 2 Pole breaker in 3/4 in body thin series
  • Intertek ETL Listing to UL Standard 489 for US and Canada -Molded case circuit breakers
  • Manufactured New by Connecticut Electric
  • For use in Zinsco Type RC circuit breaker panels
  • Plug in type
  • 40 AMP, 120/240 VAC circuit breakers with 10,000 AIC
Weight 0.57 lbs
Dimensions 6.75 × 1.73 × 6.75 in

Latest reviews

  1. H2oPro

    When my SPA stopped working I was suddenly faced with the fear that something major had gone wrong with my SPA. Deciding to do some basic troubleshooting with a multimeter I noticed that one leg of the circuit was only producing 45 VAC and the other was 110 VAC. Tracing it back to the main panel I got the same readings. Obviously, the circuit breaker was bad and needed to be replaced. I was surprised to find an exact replacement at . Got home and swapped out the breaker. Problem solved! For less than the price of a good steak dinner, I was soaking in the satisfaction of being self-sufficient. Thanks, !

  2. Ken

    I have Zinsco circuit breakers at my house. What I have read is that they are not very good (though they are quite pricy). I have two AC units (one upstairs and one downstairs).
    The downstairs AC kept tripping the breaker and I thought maybe the unit was going bad. But then I thought, well if the circuit was bad it would probably not run at all. What was happening is that the AC would run for several minutes and then trip. So than I decided that before I call out an AC guy to check the unit I would try just swapping out the breaker to see it that worked. It did. So I guess the breaker was overheating which was tripping the breaker. It has been working now for a few weeks so I declare it a good fix and I probably saved a couple of hundred dollars.
    This is an after market product but for all I know it will work better than the original.

  3. Jefe

    We had a twin 20 that had one weak side. I swapped it out in less than 15 minutes as that was the time limit on out back-up battery. Also, Lowe’s was 20-30 dollars cheaper than everyone else. Thanks again, Lowe’s!
    I’m able to run the air conditioner in the office again.

  4. Arden

    Worked perfect! UL approved Zinsco/Sylvania GTE replacement – saved me $3k woodchuck estimates from 2 electricians. Electrician I latered hired recognized product as safe.

  5. Trav

    the breakers has stood the test of time, yes they suck to pull and they rant made anymore, but if you have a can and this type of breaker there usually a good product

  6. John

    I own an older home and parts for older systems can be hard to find. Lost power on a very hot day needed a breaker now! They had it in stock! Cool!

  7. Jen

    It’s a circuit breaker so it’s kinda hard to get all excited about it but it went right in and didn’t explode. That’s good, right?

  8. BradR

    This breaker is replacing a bad breaker. It fits perfectly in my Sylvania/Gte box. It replaces a Zinsco breaker.

  9. Chuck

    Product worked perfect to replace the old Zinco breaker. It was the same size and easy to install.

  10. Anonymous

    The two poles were tied together. Who would have thought it? I had to cut the tie with a hacksaw.

  11. MichaelB

    These Breakers are a good replacement for the older unsafe breakers still in use.

  12. Bracken

    Installed easily. I am much more comfortable with GFCI on my car charger.

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