Relay model in the Shelly X MOD1 relay devkit?

[Vaizki]

The schematics for the relay devkit indicate that the relays are https://www.te.com/usa-en/product-1461404-1.datasheet.pdf but these are 3A relays, not 16A.

Apparently some early green PCB versions used Hongfa relays which are 16A but they do not have any kind of rating for DC current.

The user guide has strange specs:

• Relay channel AC voltage range 110 - 240 VAC
• Relay channel DC voltage range 5 - 30 VDC
• Relay channel AC nominal current at Ta=25°C 16 A

I can't really understand why there would be a MINIMUM voltage for the relay? Surely I can do 24 VAC over it? Also what is the allowed DC current? 

So.. what is the actual relay model in the production devkits?

[thgoebel]

The devkit contains 4 pc. relay HF32FV-16 12-HLTF (590). Unfortunately, for this relay type DC load values are not specified:

 

(Source: https://source.hongfa.com//Api/DownloadPdf/260)

Thus, Shelly Europe Ltd. declares the specs a bit fuzzy. The reason for indicating AC contact specs only seems to be the contact material: AgSnO2. Comparable relays with the same contact material by other manufacturers give DC rating with 3-5A @30V. Would recommend to choose this rating as upper limit for the devkit. Higher DC voltages would cause issues with arc quenching.

 

Edited November 4 by thgoebel

[Vaizki]

Yes, I found those Hongfa specs.. I was also assuming that my case of 24VDC @ <1A would be ok, just weird that there are no specs whatsoever for DC.

Also the user guide and schematics should not point people to a TE datasheet if those relays are not used... 

[thgoebel]

24V DC with load current <1A will be no issue.