The present disclosure relates a terminal assembly for a vacuum contactor switch which is connected to a terminal of a cradle with electricity applicability to protect a power system by breaking circuits in the event of a dangerous situation such as a short circuit or an overcurrent. The terminal assembly includes a body portion, a connecting member, a contactor and a bush. The body portion is inserted into a terminal hole formed in the terminal of the cradle and provided with first fastening holes formed in opposite side surface thereof. The contactor is connected to one end of the body portion through a connecting member. The bush has a pair of pieces disposed to surround a periphery of the body portion with both ends of one of the pieces facing both ends of the other piece.