Hello . I would like to ask a few questions about DC electromechanical relays. let's consider a quantity of signal relays that are all the same. the relay contacts take a certain time to close and a certain time to switch off. I assume that each relay has slightly different closing and opening times than the others. how much could the difference be in milliseconds?. I don't know yet if it's worth it, because I don't know how much time difference there is between one relay and another, the need is to obtain perfectly synchronized closing and opening of the contacts of all relays. in case you need to turn on and off a small group of relays, say three or five, instead of powering the coils together individually and in parallel at the same voltage is it possible to power the coils in series using a higher total voltage? does this solve the problem?