![]() ![]() I believe the 1+N breaker described by in another answer refers to stand-alone circuit breakers. ![]() In my first paragraph, I was referring to circuit breakers of the type mentioned in the question that plug in to North American distribution panels. Even purchasing new-old-stock circuit breakers is less then the best idea. It is not a good idea to install any circuit breaker that is not purchased new. There should be sufficient information marked somewhere on each breaker to identify each one as a circuit breaker if separated. If a device is a two-pole circuit breaker with two handles tied together, the trip rating should be marked on each handle. That is true whether it has one handle or two handles tied together. Such an assembly must not be offered for sale as a two-pole circuit breaker.Ī two-pole circuit breaker is two circuit breakers that open simultaneously if either one trips. It would be more than unusual to find such an assembly offered for sale today. There may be or may have been at some time, a legitimate use for a circuit breaker connected to a switch with a handle-tie. If not both can trip, what would happen if the live line that shorts to the enclosure is connected to the breaker side that doesn't have short circuit protection? I need to know this because I'm powering up 240v load and there is ground wire to the enclosure. Presumably, breakers made to be used as single-pole provide both protections in a single breaker, as do double-pole breakers used as a unit." It’s unknown which side may provide over current protection. We found that only one side of our double pole breaker provide short circuit protection. We then tested the breakers on a test circuit. This must have been a huge overload, far beyond 20 amps. We found this out the hard way when we had a total short in one of our circuits and the 20 amp breaker did not trip, but instead melted a #12 AWG wire. The double-pole breakers are NOT just two single pole breakers physically joined. ![]() "The assumption that the two halves of DP breakers can serve as SP breakers proved to be very wrong. The person who tested the 2-pole breaker to have only 1 side tripping is an US citizen who has done many tests with it. Double pole breakers come in one of three configurations: two breakers in one housing and one common switch two breakers in one housing with two separate switches tied together from the factory two separate breakers with a tie connector field installed. Anyone familiar with it? Does only one side trip? Someone stated that only one side of the double pole breaker provided short circuit protection. Maybe you're looking for double pole breaker, consider Square D QO models.How many of you have used double pole breakers?Īre double-pole breakers just two single pole breakers physically joined? You should not install a breaker, switch, or other device on this ground wire.Īre you asking about USA location, what size PV system & configuration? Each panel in a PV array (its frame) should be grounded to each other and to earth. Take bullet 2-a breaker shall not be installed on a grounded conductor. Then both legs (+ & -) require this (overcurrent) protection-hence a double pole breaker. Overcurrent (not just disconnect) protection is required with more than 3 parallel strings in an array. This breaker is installed as a disconnect and can be sized (amperage) as 1.56 times the Isc of the array. Some now popular MPPT devices do not include a PV array disconnect within their unit and installation of a separate DC is breaker is handy. Hot pin break out Style 1 Square D Homeline 50A Double-Pole Standard Trip Circuit Breaker HOM250C Low prices storewide The Style of Your Life, US 40. Makes sense, particularly for maintenance. Circuit Breakers & Disconnectors facebook twitter linkedin pinterest 1 Square D Homeline 50A Double-Pole Standard Trip Circuit Breaker HOM250C. There are a lot of variables, with PV array configurations/size, your location in the world but (for USA)īullet 1-Provide a disconnect from the PV array to everything else. Well I do not know if you are misinterpreting. ![]()
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