Contactor Selection

Discussion in 'General Electronics Chat' started by Jsw123, Aug 5, 2009.

  1. Jsw123

    Thread Starter Active Member

    Jun 20, 2009
    I am trying to protect two power sources from two generators from overcurrent, under/overvoltage, under/overfrequency,etc.
    There will be two generators running during the day and one running at night, I have double throw switches to switch the two breaker panels to run on one generator each or to share one generator. One generator's relay will run almost 24/7 and the other will cycle once per day.
    (Generators not ran in parallel.)

    I do not wish to use a shunt trip breaker connected to the protective relays for this purpose because I do not have an uninterruptable power supply. I was thinking of using a normally open contactor instead. I know a regular electromechanical relay will not last long in this application. What I am wondering is if it would be best to use a solid state relay or a mercury relay or something else for this application?

    The generators are 83 amp 120/208 volt 3 phase 24 KW.
    Last edited: Aug 5, 2009