Square D 
Electrically Held Lighting Contactor
8903 SQG-12 
100 Amp Rated
4 Pole
3 Wire 
120 Volt AC 60Hz / 110 Volt AC 50Hz Coil
Tungsten Lamp 277-480 Volt
Ballast Lamp 347-600 Volt
Resistance Heating 600 Volt
250 Volt DC Max w/ 2 poles in Series
Used

(Loc: EE-3E2)