Electrical insulating oil composition having excellent low temperature properties

An electrical insulating oil composition comprising:

• [A] 1,1-diphenylethane in an amount of 30 to 70 percent by mass;
• [B] at least one or more component selected from 3 components that are (a) 1-phenyl-1-methylphenylethane, (b) 1-phenyl-1-xylylethane and (c) 1-phenyl-1-ethylphenylethane in a total amount of 30 to 70 percent by mass;
• and
• [C] 1,2-diphenylethane in an amount of 0.1 to 2 percent by mass and/or diphenylmethane in an amount of 0.1 to 13 percent by mass.

An electrical insulating oil composition comprising:

• [A] 1,1-diphenylethane in an amount of 30 to 70 percent by mass;
• [B] (a) 1-phenyl-1-methylphenylethane in an amount of 30 to 70 percent by mass;
• and
• [C] 1,2-diphenylethane in an amount of 0.1 to 2 percent by mass and/or diphenylmethane in an amount of 0.1 to 13 percent by mass.