RLY01H

[slychiu]

The relays are rated for  230V 16A for the RLY01 and RLY01H

It is the PCB that is different. The RLY01H PCB has more spacing between the tracks for 230V and the PCB copper is thicker to handle the higher current

The RLY01H was introduced only in mid 2014

The 2 versions are shown in the attached photo.
The marking RLY01B is the 230V version

The introduction of the RLY01H was not handled well by us for which we apologise

[Swiss-Toni]

No need for apologies, it is perfectly clear to me & it appears mine are all the lower voltage type. I did read that you may consider changing the connectors (the blue blocks). I prefer the ones we are currently using at it makes it easier to manipulate rather than having to pull the whole board out to screw wires in, the red dot idea in my opinion would suffice....