I recently created a home wi-fi automation using ESP32 in which it include lots of Relays (coiled and SSRs). And due to power consumption and heating of power adapters, I added a main switch that would turn on the Power adapter then the esp32. As such, whenever I power on the switch, the output pins connected to data pins of SSR would instantaneously turn on for about a sec and therefore turn on the connected devices/appliances but oddly enough those traditional coiled relays is not affected...
Voltage spike in ESP32 output?
Voltage spike in ESP32 output?