An electrical contact assembly electrical contact assembly comprises upper contact having a lower mating end at a lower end thereof, a lower contact having a base portion and a pair of mating beams extending vertically from the base portion for a length respectively and for engaging with the lower mating end of the upper contact, and a spring located between the upper contact and the lower contact. A channel is defined between the mating beams and providing a space to allow movement of the lower mating end. The pair of mating end has unequal lengths for providing unequal torque on the lower mating end, thus ensuring reliable electrical connection between the upper contact and lower contact even under worse circumstance.