I have a Otis home elevator (3 stops) that needs a relay which is marked 23621 Japan RH2VUL DC24V but no brand indicated. Does any body know of a replacement?

 

None of the numbers come up. Can you post a picture?
Here's a bunch of 24DC coil relays to look through to see what you might have.

 

That is an IDEC Part number. Go here and click "Documents & Downloads for coil & contact specs on that relay.

https://www.idec.com/usen/products/Catalogs/Relays/RH/overview.html

There are 100's of manufacturers that offer the same relay with the same blade configuration - including WW Grainger. Just make sure the coil and contact ratings are similar.