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No volt realese switches.

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magpie13/04/2019 07:56:03
449 forum posts
80 photos

I wonder if anyone could tell me if there is any difference between a KJD17B switch and a CK21 switch. They both look identical, but there are lots of CK21 available but very few of the KJD17B. I ordered the latter from Ebay and was sent a refund because the seller didn't have one. My mill is out of action in the meantime and I could do with getting a new one quickly.

Robert Atkinson 213/04/2019 08:25:35
610 forum posts
16 photos

Considering that this "KJD17B"

is a CK21 with a CE sticker over the CK21 mark (see last photo and compare to 4th photo of )

I'd say no there is no practical difference.

Robert G8RPI

john swift 113/04/2019 09:44:52
318 forum posts
183 photos

looking at photos of the switches

the KJD17B has the solenoid connectly to the switched output terminals 14 & 24





the CK21 has only one end of the solenoid connected to the switched output 2

the other end of the solenoid goes to a small 5th terminal you have to connect to switched output 1

this enables you to add one or more normally closed remote E-stop switches

use terminals 3 & 4 as the mains input


ck21 switch.jpg

if you don't need to add any E-stop switches you can use either switch





Edited By john swift 1 on 13/04/2019 09:45:52

Robert Atkinson 213/04/2019 10:27:11
610 forum posts
16 photos

seems I found a "fake" KJD17B John is correct.

Robert G8RPI.

magpie13/04/2019 15:20:14
449 forum posts
80 photos

Thanks for the info John, and Robert. I have ordered a CK21.

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