Langir breakers actually rated for 500V?

I'm having trouble believing that these Langir breakers are actually rated for 20A at 500V. Why do I see no other breakers available anywhere else that come close to that price and voltage rating? I've seen a lot of people using those as 300V+ disconnects in PV combiners/pass through boxes and wondered if they are even wired correctly. For the 500V rating are you supposed to put the 2 poles in series? All the images I've seen of people using those in combiner boxes uses that single 2 pole breaker for both the positive and negative. Midnite has a 600V 16A rated breaker and that is also around $150 and has 4 poles all in series to get that 600V rating.

Are these actually legit or being used correctly?

rhino said:

I'm having trouble believing that these Langir breakers are actually rated for 20A at 500V. Why do I see no other breakers available anywhere else that come close to that price and voltage rating? I've seen a lot of people using those as 300V+ disconnects in PV combiners/pass through boxes and wondered if they are even wired correctly. For the 500V rating are you supposed to put the 2 poles in series? All the images I've seen of people using those in combiner boxes uses that single 2 pole breaker for both the positive and negative. Midnite has a 600V 16A rated breaker and that is also around $150 and has 4 poles all in series to get that 600V rating.

Are these actually legit or being used correctly?

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At that price point I would NOT trust them. If it sounds too good to be true....
For safety devices, it is a good idea to stay with the names you know.
It may be more expensive, but how much is your system worth, not to mention your life.

I'm not an electrical engineer however typically Amazon has a good reputation for controlling the sellers on their platform. The other commenter makes it sound like because they're inexpensive they must be too good of a deal, however, places that only sell specific products and depend on solar-only components for their business will typically add large margins to their products.

It is sorta like going to a local bath/shower/kitchen supply store that has a nice showroom, in most cases, the EXACT same item from a nationwide brand like Delta or Moen, etc will be significantly higher than purchasing from Amazon or Costco or a retailer that spreads their margin around thousands of products and has higher volume to sell at closer to cost.

That said, I'm not claiming these products do exactly what they say, what I am saying is that don't be surprised that a seller like Amazon could sell the exact same or similar product for a much lower price than a very specific solar or electrical supply type store/etailer.

One thing of note this are rated 250volts on one pole, and only 500volts when both poles are used.

pvgirl said:

One thing of note this are rated 250volts on one pole, and only 500volts when both poles are used.

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So the people that are using these for 300V+ strings and using one pole for positive and one for negative (which I've seen pictures of on this forum) is actually not correct/safe. They are making the assumption like I think a lot of people are that it is 500V per pole.

rhino said:

So the people that are using these for 300V+ strings and using one pole for positive and one for negative (which I've seen pictures of on this forum) is actually not correct/safe. They are making the assumption like I think a lot of people are that it is 500V per pole.

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No, that's fine. Both poles are used to open a single circuit.

I’ve got these in my combiner box for my ground mount arrays, on the outside of the house, and inside my power room.
All are two pole unpolarized, so I disconnect both + and -.
Max voltage for me is 250V.

They’ve been reliable for 6 months, at least as disconnect switches.
But do I trust them? not yet. I may try some deliberate overload testing at some point.
I‘ve also got one midnite solar 50a two pole breaker for GFPD (but it is polarized).

Here is the data sheet. They look legit, but who can be sure.
https://www.langir.com/dc-circuit-breaker/

There is a pdf brochure on that page as well.

The two things that concern me about it is how cheap they are compared to other ones on the market and that you don't see them at any of the solar distributors.

Langir claims TÜV Rheinland safety certificate, and it looks like they have done it.
https://www.certipedia.com/quality_marks/1111274033?locale=en&certificate_number=50599940

It isn‘t UL, which would really be a home run, but this is a bone fide test lab, certainly acceptable for European markets.
Perhaps less impressive in the USA.

ricardocello said:

Langir claims TÜV Rheinland safety certificate, and it looks like they have done it.
https://www.certipedia.com/quality_marks/1111274033?locale=en&certificate_number=50599940

It isn‘t UL, which would really be a home run, but this is a bone fide test lab, certainly acceptable for European markets.
Perhaps less impressive in the USA.

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While it doesn't seem to be the case for this cert, as I see no reference to any UL standards, TUV can do testing to UL standards like any other NRTL.