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These relays come in two flavors, intermittent and continuos duty solenoid coils.
Intermittent duty solenoids actuate faster than continuous duty solenoids so are
less prone to arcing of the contacts but will overheat if power is supplied to the
solenoid coil continuously. Intermittent duty solenoids should be used for starter
motors and continuos duty solenoids should be used for master relays.

I suspect you are using an intermittent duty solenoid for a master relay and it is
overheating but I may also be wrong and "too hot to touch" may be the "normal
operating temperature". Too hot to touch is between 130 and 140 degrees Fahrenheit
and the maximum. Stancore lists the maximum ambient temperature for their
contactors at 149 degrees Fahrenheit. Cross check the part number of yours with the
manufacturer to be sure.

Regards
Brent Regan

LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html