Abstract: A breaker comprises: a first terminal piece on which a fixed contact is formed; a movable piece having a movable contact, for pressing the movable contact against the fixed contact so as to contact therewith; a thermally-actuated element deforming with a change in temperature and moving the movable piece so that the movable contact is separated from the fixed contact, and a second terminal piece electrically connected to the movable piece. The movable piece is provided, within a contact portion contacting with the second terminal piece, with a protrusion projecting toward the thermally-actuated element.

Abstract: A breaker is provided with a first terminal piece on which a fixed contact is formed, a movable piece with a movable contact for pressing the movable contact against the fixed contact so as to contact therewith, a thermally-actuated element deforming with a change in temperature and moving the movable piece so that the movable contact is separated from the fixed contact, and a second terminal piece electrically connected to the movable piece. The movable contact includes a first movable contact and a second movable contact arranged at a first end portion and a second end portion, respectively, of the movable piece in its longitudinal direction. The fixed contact includes a first fixed contact arranged at a position with which the first movable contact can contact, and a second fixed contact arranged at a position with which the second movable contact can contact.

Abstract: A current cut-off device includes a plate-shaped terminal piece having a contact, a movable piece including an elastic portion formed in a plate shape so as to be elastically deformed and a movable contact arranged at one end portion of the elastic portion and having the movable contact so as to be pressed against and in contact with the contact, and a thermally actuated element which biases the movable piece by deforming in accordance with a temperature change and causes a state of the movable piece to be shifted from a conductive state in which the movable contact is in contact with the contact to a cut-off state in which the movable contact is separated from the contact. When the state of the movable piece is shifted from the conductive state to the cut-off state, as the movable contact moves, it gets over the contact.

Abstract: The breaker is provided with a fixed contact, a movable piece having an elastic portion and a movable contact, a thermally-actuated element deforming with a change in the temperature so as to shift the movable piece from a conduction state to a cut-off state, a case main body housing the movable piece and the thermally-actuated element, a lid member attached to the case main body, and a plate-shaped cover piece embedded in the lid member. The case main body is provided with a first fixing surface fixed to the lid member, and the lid member is provided with a second fixing surface fixed to the case main body. The second fixing surface is provided with a protruding portion protruding toward the first fixing surface, and the protruding portion and the cover piece are overlapped with each other in the plan view as viewed in the thickness direction of the cover piece.

Abstract: A breaker comprises: a fixed piece having a fixed contact; a movable piece having a movable contact and pressing the movable contact against the fixed contact to contact therewith; a thermally-actuated element for shifting the movable piece from a conduction state in which the movable contact contacts with the fixed contact to a turn-off state; a PCT thermistor; and a resin case. The fixed piece has a contacting portion contacting with the PCT thermistor. The resin case has a bottom surface provided with a concave portion. In a planar view when the fixed piece is viewed from the PCT thermistor, the contacting portion is disposed within the concave portion. The concave portion has a bottom recessed from the bottom surface of the resin case to prevent the bottom from protruding outwardly from the bottom surface when the thermally-actuated element is deformed.

Abstract: The breaker 1 is provided with a fixed contact 20, a movable piece 4 extending in a first direction (D1), a thermally actuated element 5, a case 7 accommodating the movable piece 4 and the thermally actuated element 5, and a terminal piece 2 which partially protrudes outside the case 7 and is to be electrically connected with an external circuit. The terminal piece 2 has a first portion 21 and a second portions 22 having different heights from a bottom surface of the case 7, a first bent portion (23a) bent in a first bending direction, and a second bent portion (23b) bent in a second bending direction opposite to the first bending direction. The first bent portion (23a) and the second bent portion (23b) extend in parallel with the first direction (D1).

Abstract: A breaker has a fixed contact, a movable piece which has an elastic portion formed in a plate shape and being elastically deformable, and a movable contact in one end portion of the elastic portion so as to press the movable contact against the fixed contact, a thermally-actuated element which is deformed in accordance with a temperature change and shifts from a conduction state in which the movable contact contacts with the fixed contact to a shut-off state in which the movable contact separates from the fixed contact, and a case which accommodates the fixed contact, the movable piece, and the thermally-actuated element. The case has a side wall extending in a long direction of the movable piece, and the side wall is provided, in an adjacent portion to the thermally-actuated element, with a convex portion protruding toward the outside of the case.

Abstract: A current cut-off device 1 includes a plate-shaped terminal piece 2 having a contact 21, a movable piece 4 including an elastic portion 44 formed in a plate shape so as to be elastically deformed and a movable contact 41 arranged at one end portion of the elastic portion 44 and having the movable contact 41 so as to be pressed against and in contact with the contact 21, and a thermally actuated element 5 which biases the movable piece 4 by deforming in accordance with a temperature change and causes a state of the movable piece 4 to be shifted from a conductive state in which the movable contact 41 is in contact with the contact 21 to a cut-off state in which the movable contact 41 is separated from the contact 21. When the state of the movable piece 4 is shifted from the conductive state to the cut-off state, as the movable contact 41 moves, it gets over the contact 21.

Abstract: Provided is a breaker capable of further downsizing without impairing rigidity and strength of a case. The breaker 1 comprises a fixed contact 21, a movable piece 4 having and pressing a movable contact 41 to the fixed contact 21, a thermally responsive element 5 for moving the movable piece 4 to separate the movable contact 41 from the fixed contact 21 by deformation thereof responding to temperature change, a case for containing the fixed piece 21, the movable piece 4 and the thermally responsive element 5, and a cover piece 8 attached on the case 7. The case 7 has an end face 72 on which the cover piece 8 is disposed, a containing recess 73 caved from the end face 72 and forming a space to which the movable piece 4 and the thermally responsive element 5 are contained, and a first protrusion protruding from the end face 72 and to which the cover piece 8 is fitted.

Abstract: The breaker 1 is provided with a fixed contact 21, a movable piece 4 having an elastic portion 43 and a movable contact 41, a thermally-actuated element 5 deforming with a change in the temperature so as to shift the movable piece 4 from a conduction state to a cut-off state, a case main body 7 housing the movable piece 4 and the thermally-actuated element 5, a lid member 8 attached to the case main body 7, and a plate-shaped cover piece 9 embedded in the lid member 8. The case main body 7 is provided with a first fixing surface 75 fixed to the lid member 8, and the lid member 8 is provided with a second fixing surface 85 fixed to the case main body 7. The second fixing surface 85 is provided with a protruding portion 86 protruding toward the first fixing surface 75, and the protruding portion 86 and the cover piece 9 are overlapped with each other in the plan view as viewed in the thickness direction of the cover piece 9.

Abstract: Provided is a breaker capable of further downsizing without impairing rigidity and strength of a case. The breaker comprises a fixed contact, a movable piece 4 having and pressing a movable contact to the fixed contact, a thermally responsive element for moving the movable piece to separate the movable contact from the fixed contact by deformation thereof responding to temperature change, a case for containing the fixed piece, the movable piece and the thermally responsive element, and a cover piece attached on the case. The case has an end face on which the cover piece is disposed, a containing recess caved from the end face and forming a space to which the movable piece and the thermally responsive element are contained, and a first protrusion protruding from the end face and to which the cover piece is fitted.

Abstract: A breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 including a movable contact 41 and having the movable contact 41 so as to be pressed against and in contact with the fixed contact 21, a thermally actuated element 5 shifting the movable piece 4 from a conductive state to a cut-off state in accordance with a temperature change, and a case 7 accommodating the fixed piece 2, the movable piece 4, and the thermally actuated element 5. The case 7 includes a case main body 71 accommodating the movable piece 4 and the thermally actuated element 5, a lid member 81 covering a housing concave portion 73 of the case main body 71, and a metal plate 9 embedded in the lid member 81. Heat capacity of the metal plate 9 is larger than heat capacity of the fixed piece 2.

Abstract: The breaker 1 is provided with a fixed contact 20, a movable piece 4 extending in a first direction (D1), a thermally actuated element 5, a case 7 accommodating the movable piece 4 and the thermally actuated element 5, and a terminal piece 2 which partially protrudes outside the case 7 and is to be electrically connected with an external circuit. The terminal piece 2 has a first portion 21 and a second portions 22 having different heights from a bottom surface of the case 7, a first bent portion (23a) bent in a first bending direction, and a second bent portion (23b) bent in a second bending direction opposite to the first bending direction. The first bent portion (23a) and the second bent portion (23b) extend in parallel with the first direction (D1).

Abstract: A breaker 1 has a fixed contact 21, a movable piece 4 which has an elastic portion 43 formed in a plate shape and being elastically deformable, and a movable contact 41 in one end portion of the elastic portion 43, so as to press the movable contact 41 against the fixed contact 21, a thermally-actuated element 5 which is deformed in accordance with a temperature change, and shifts from a conduction state in which the movable contact 41 contacts with the fixed contact 21 to a shut-off state in which the movable contact 41 separates from the fixed contact 21, and a case 10 which accommodates the fixed contact 21, the movable piece 4, and the thermally-actuated element 5. The case 10 has a side wall 11 extending in a long direction Dl of the movable piece 4, and the side wall 11 is provided, in an adjacent portion to the thermally-actuated element 5, with a convex portion 14 protruding toward the outside of the case 10.

Abstract: A breaker 1 has a fixed piece 2 having a fixed contact 20, a movable piece 4 having a movable contact 41 and pressing the movable contact 41 against the fixed contact 20 to contact therewith, a thermally-actuated element 5 deforming with a change in the temperature so as to shift the movable piece 4 from a conduction state in which the movable contact 41 contacts with the fixed contact 20 to a turn-off state in which the movable contact 41 is separated from the fixed contact 20, a PCT thermistor 6 providing an electrical conduction between the movable piece 4 and the fixed piece 2 when the movable piece 4 is in the above-said turn-off state, and a resin case 10 accommodating the fixed piece 2, the movable piece 4, the thermally-actuated element 5, and the PCT thermistor 6.

Abstract: A breaker has a movable piece which has an elastic part elastically deformable and a moving contact in one end portion of the elastic part, and which presses the moving contact against the fixed contact so that the moving contact contacts with the fixed contact; a thermally-actuated element deforming with a change in the temperature to actuate the movable piece so that the moving contact is separated from the fixed contact; a case housing the movable piece and the thermally-actuated element; and a terminal piece to be connected to an external circuit. The case has a side wall extending along a longitudinal direction of the elastic part. The terminal piece has a protruding portion which protrudes from the side wall toward the outside of the case. The side wall is provided, in its neighboring portion of the protruding portion, with a concave portion which dents inwardly of the case.

Abstract: A breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 including a movable contact 41 and having the movable contact 41 so as to be pressed against and in contact with the fixed contact 21, a thermally actuated element 5 shifting the movable piece 4 from a conductive state to a cut-off state in accordance with a temperature change, and a case 7 accommodating the fixed piece 2, the movable piece 4, and the thermally actuated element 5. The case 7 includes a case main body 71 accommodating the movable piece 4 and the thermally actuated element 5, a lid member 81 covering a housing concave portion 73 of the case main body 71, and a metal plate 9 embedded in the lid member 81. Heat capacity of the metal plate 9 is larger than heat capacity of the fixed piece 2.

Abstract: A breaker (1) is provided with: a fixed piece (2) which has a fixed contact; a movable piece which has a movable contact at a front end portion and pushes the movable contact against the fixed contact to bring same into contact with each other; a thermally responsive element that deforms in accordance with a change in temperature and thereby actuates the movable piece so that the movable contact separates from the fixed contact; and a case body (71) of a resin case that accommodates the fixed piece (2), the movable piece, and the thermally responsive element. The case body (71) has recess portions (75, 77) which are recessed from a peripheral portion, and the fixed piece (2) has a withdrawal portion (25) that withdraws from the recess portions (75, 77) of the case body (71) by a predetermined first distance (D1) or more, and is embedded in the case body (71).

Abstract: A circuit breaker 1 comprises: a fixed-contact piece 2 with a fixed contact 21; a movable-contact piece 4 with a movable contact 41; a thermal actuator element 5 thermally transformable to move the movable-contact piece; a PTC thermistor 6 for conducting electricity between the movable-contact piece 4 and the fixed-contact piece 2; a main body 71 of a package provided with a holding recess 73 housing the above-mentioned components; and a cover 81 hermetically covering the holding recess 73. The fixed-contact piece 2 is embedded between an internal wall 74 and an external wall 75 of the main body 71. The PTC thermistor 6 is housed in an opened hollow 73d. In a planar view of the circuit breaker, a through-hole 76 penetrating through the external wall 75 overlaps with the opened hollow 73d, but does not overlap with the centroid O of the opened hollow 73d.

Abstract: A breaker is provided with: a movable piece (4) that has an elastically deformable elastic portion (43) and a movable contact on the tip of the elastic portion (43) and that presses the movable contact into contact with a fixed contact; a thermal actuator element (5) that is formed into a shape with a convex surface and is deformed by a change in temperature, thereby actuating the movable piece (4) so that the movable contact separates from the fixed contact; and a resin case (7) which houses the movable piece (4) and the thermal actuator element (5). The bottom surface of the base end (42a) of the movable piece (4) is positioned lower than the top (5a) of the upper surface of the thermal actuator element (5) by a distance (D). Thereby, a stable temperature adjustability and a resistance value are ensured in a breaker used as a protection device for a secondary battery with miniturization brought into realty.