Power supply switch

A power supply switch comprising a housing, an operating member pivotably supported substantially at the middle of said housing, a movable contactor provided at one end with a movable contact engageable with and disengageable from a fixed contact and at the other end with a latch part, resilient means for linking between one end of said operating member and substantially the central part of said movable contactor, a tension spring engaged at one end of the movable contactor to the other end of the operating member and at the other end to the movable contactor at a position between the linking point of said link means and said one end having said movable contact of said movable contactor for biasing the movable contactor in a direction of disengaging from said fixed contact, means engageable with said latch part of the movable contactor for latching the contactor into a contact closing position of engaging the movable contact with said fixed contact as the contactor is moved with a rotation of the operating member, with the linking point of the operating member to the link means shifted beyond an imaginary line connecting between the pivoting axis of the operating member and said linking point of the link means to the movable contactor said resilient linking means being slightly compressed in said contact closing position of the movable contactor for providing thereto a contact pressure to the fixed contact, means engaged with said latch means for biasing it in a direction of engaging with said latch part of the movable contactor, and means engaged with the latch means for tripping the latch means out of engaging position with the latch part against the force of said biasing means to forcibly break the contacts.