I've read on this forum that the 18D KTU will provide A Lead control when connected in front of the 400-type KTU. I need 2 for my home application (I have one already). These hardly ever come up on eBay; I see relays out there now, the...

2A
5A
6B
17B

Can any of these be used (I didn't locate info in any BSPs on these)? I only need the function to show line in use, not removing from hold if this makes a difference.

Thanks for any guidance!

Jim