Abstract: A thermally responsive switch includes a container including a metal housing and a header plate, at least one conductive terminal pin inserted through a hole of the header plate, a fixed contact fixed to the terminal pin, a thermally responsive plate having one of two ends conductively connected via a support to an inner surface of the container and reversing a direction of curvature at a predetermined temperature, and at least one movable contact electrically conductively secured directly to the other end of the thermally responsive plate. Each contact is comprised of a silver-cadmium oxide system contact. The container is filled with a gas containing helium ranging from 50% to 95% so that an internal pressure of the container ranges from 0.38 atmosphere to 0.68 atmosphere at room temperature such that arc generated during opening of the contacts moves on surfaces of the contacts without spreading from the contacts.

Abstract: A thermally responsive switch includes a hermetically sealed container including a metal housing and a header plate, at least one conductive terminal pin hermetically fixed in a through hole, a fixed contact fixed-to the terminal pin in the container, a thermally responsive plate having one end connected via a support to an inner surface of the container and reversing a curvature direction at a predetermined temperature, and at least one movable contact electrically conductively secured to the other end of the thermally responsive plate. Each contact includes a silver-tin oxide-indium oxide system contact. The container is filled with a gas containing helium ranging from 50% to 95% so that an internal pressure of the container ranges from 0.3 to 0.6 atmosphere at room temperature.

Abstract: A thermally responsive switch includes a hermetic container (2) including a metal housing (3) and a header plate (4), at least one conductive terminal pin (10A, 10B) hermetically fixed in the through hole (4A, 4B), a fixed contact (8) fixed to the terminal pin (10A, 10B) in the container (2), a thermally responsive plate (6) having one end connected and fixed to an inner surface of the container (2) and reversing a direction of curvature at a predetermined temperature, and at least one movable contact (7) secured to the other end of the thermally responsive plate (6). Each of the fixed contact (8) and the movable contact (7) includes a silver-cadmium oxide system contact, and the container (2) is filled with a gas containing helium ranging from 50% to 95% so that an internal pressure of the container (2) ranges from 0.38 to 0.68 atm. at room temperature.

Abstract: A thermally responsive switch includes a hermetic container (2) including a metal housing (3) and a header plate (4), at least one conductive terminal pin (10A, 10B) hermetically fixed in the through hole (4A, 4B), a fixed contact (8) fixed to the terminal pin (10A, 10B) in the container (2), a thermally responsive plate (6) having one end connected and fixed to an inner surface of the container (2) and reversing a direction of curvature at a predetermined temperature, and at least one movable contact (7) secured to the other end of the thermally responsive plate (6). Each of the fixed contact (8) and the movable contact (7) includes a silver-tin oxide-indium oxide system contact, and the container (2) is filled with a gas containing helium ranging from 50% to 95% so that an internal pressure of the container (2) ranges from 0.25 to 0.8 atm. at room temperature.