Can anyone help me identify this connector?
It is 3 pin wire-to-wire female connector, distance between center of the pins is 4.5mm, each whole is 4mm. One of the pin holes is square. Looks like some kind of molex connector.
Electronic – What connector type is this 3 pin connector
connectoridentification
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I figured it out, they are JST XMR connectors.
Specifically XMR-10V and XMR-06V
OK, I contacted Molex and I found out that this is a Molex Mini Fit 3-pin connector custom-made part because the polarization is different from the standard Mini Fits. I asked which part number most closely resembled this one and was told Part Number: 39-01-4032, Mini-Fit Jr.™ Plug Housing, Single Row with Panel Mount Ears
I ordered some samples and this fits amazingly well. It has 2 square holes but they fit the mating 'pins' well. I had to cut in a groove to accomodate the key and I had to file down the lock tab so it could be disassembled without having to use a finger to lift the tab. So I have all the functionality of the original connector.
So it looks like alex.forencich and Michael Kjörling were right about the general type of connector. Thank you.
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Best Answer
This is a JST EL connector.
It doesn't seem possible to get them from my usual sources. However, they do appear to still be made, and you can buy them directly from JST on their website, as long as you're willing to buy a lot of them. The one you have in particular is ELR-03V, which costs ¥35 (about $0.33 US with current exchange rates) each in quantities as low as 10. (for just the housing, contacts are a different story)
Its mating connector would be the ELP-03V, which apparently you can only buy in quantities of at least 500, for ¥4.20 (approx. US$0.04) each
The relevant contacts are about ¥7 (approx. US$0.07) each but there are too many variables (what size wire you want, in particular) for me to bother linking to individual contact pages on JST's shop.