I bought a couple Shelly 3 Pro for automating various 3-phase pumps. During my bench tests w/ Home Assistant I notice that the three relays aren't triggering 100% simultaneously (there is a very tiny delay as the relays engage; always in the same order 1-2-3, with approx. 0.25 seconds gap in between each relay).
I'm not sure if this is due to Home Assistant / network delays etc. causing sequential triggering... But my question:
Is there any way to gang all the three relays together within the S3Pro firmware, and trigger all relays as *one* single device / entity (instead of three individual devices / entities)?
Note: My concern is to avoid the (very small) risk of one-of-three relays not 'getting the message' from Home Assistant and my borehole pumps being forced to run on less than 3 complete phases. Many thanks!
Note 2: Yeah, my alternative option is to use a single-relay type Shelly plus a 3-phase contactor (which is probably the more bullet-proof solution).