Which settings for FBH, thermo devices

[makki]

and the UK/S is able to drive the input current to the SSR ? Which kind of SSR are you using ?

AFAIR something around or above 50mA , enough at least for the 38.91.7.024.8240 (+ DIN-rail mounts)..
Standard is always better For 4 channels I wouldn't bother either and take the Heizungsaktor.. But I had some reasons: space, count (17 means 4x4+1) and the UK/S already being here and price - in reverse order..

Makki

[Warichet]

AFAIR something around or above 50mA , enough at least for the 38.91.7.024.8240 (+ DIN-rail mounts)..

You are right, the spec says:

Ausgangsstrom pro Ausgang max. 80 mA –

I thought it was around 5-10mA, just for a LED (as some other binary inputs which provide output as well.

Where can I find those 38.91.7.024.8240 ? probably something common in Germany ? but I've no clue.

[makki]

Sorry, forgot to mention the word "Finder", the vendor
So once complete: In fact it's the solid-state-relais 34.81.7.024.8240 + the blue "carrier" 93.51.7.024. These two parts form the number 38.91.7.024.8240
Also very handy: 20-way jumper link Part# 093.20 to connect through common +24V on the one and 230VAC input on the other side, reduces cables.

These are 24VDC (@10mA) in and 240VAC/2A load which is fine for thermo-actuators, but there are other variants available also, selectable here
You can get them here or from your favorite electronic shop.. Should be ~15 EUR.
Its AFAIK the cheapest "clean" solution living on the DIN-rail to get >4 SSRs. The UK/S 32.1 and relais is connected using a 2x12x0,6 YStY which reduces cables flying around to a minimum..

Makki