Abstract: An electromagnetic contactor including: an arc-extinguishing chamber in which a contact portion is disposed; a case having an arc-extinguishing chamber housing portion in which the arc-extinguishing chamber is housed; and an arc-extinguishing cover mounted on the case and configured to cover the arc-extinguishing chamber housing portion, wherein at least one of the case and the arc-extinguishing cover has a first engaging portion and a second engaging portion, the other has a third engaging portion configured to engage with the first engaging portion and the second engaging portion, and the arc-extinguishing cover is held to the case in either a first state in which the first engaging portion and the third engaging portion are engaged with each other or a second state in which the second engaging portion is engaged with the third engaging portion.

Abstract: An electromagnetic contactor 1 includes a case including an arc extinguishing chamber, an arc extinguishing cover attached to the case and covering the arc extinguishing chamber, and terminal covers arranged on the arc extinguishing cover and attached to the case. The case is formed with a first engagement portion, and the terminal covers are formed with a second engagement portion that is engaged with the first engagement portion to hold the terminal covers on the case. Then, the terminal covers are held on the case in either a first state where there is a gap between the first and second engagement portions or a second state where the terminal covers move in directions away from the arc extinguishing cover and the first and second engagement portions are engaged.

Abstract: An electromagnetic contactor including: an arc-extinguishing chamber in which a contact portion is disposed; a case having an arc-extinguishing chamber housing portion in which the arc-extinguishing chamber is housed; and an arc-extinguishing cover mounted on the case and configured to cover the arc-extinguishing chamber housing portion, wherein at least one of the case and the arc-extinguishing cover has a first engaging portion and a second engaging portion, the other has a third engaging portion configured to engage with the first engaging portion and the second engaging portion, and the arc-extinguishing cover is held to the case in either a first state in which the first engaging portion and the third engaging portion are engaged with each other or a second state in which the second engaging portion is engaged with the third engaging portion.

Abstract: A reset rod (43) of a thermal overload relay is configured to be switchable between a manual reset position in which a reversal mechanism (21) is manually returned to an initial state prior to reversal by performing a pushing-in operation, and an automatic reset position in which a pushed-in state is held by a pushing and rotating operation from this manual reset position, and the reversal mechanism (21) is automatically returned to the initial position. In addition, axial runout restriction portions (17b, 17d, 51, 46 and 47), which restrict axial runout of the reset rod (43) when the reset rod (43) is held in the automatic reset position, are provided.

Abstract: A reset rod (43) of a thermal overload relay is configured to be switchable between a manual reset position in which a reversal mechanism (21) is manually returned to an initial state prior to reversal by performing a pushing-in operation, and an automatic reset position in which a pushed-in state is held by a pushing and rotating operation from this manual reset position, and the reversal mechanism (21) is automatically returned to the initial position. In addition, axial runout restriction portions (17b, 17d, 51, 46 and 47), which restrict axial runout of the reset rod (43) when the reset rod (43) is held in the automatic reset position, are provided.

Abstract: A thermal overload relay includes a main bimetal for detection of an overload current, a shifter associated with the main bimetal, a release lever working according to a displacement of the shifter, a contact reversing mechanism for changing-over contacts by reversing action caused by rotation of the release lever, and a manipulation structure for manipulating the release lever and the contact reversing mechanism. The manipulation structure includes a reset bar for returning the contact reversing mechanism to an initial state. The reset bar is arranged to change-over between a manual reset state in which the reset bar can be pushed-in and an automatic reset state in which the reset bar is pushed-in and turned from the manual reset state and held in that state.

Abstract: A thermal overload relay has a case, a main bimetal bending upon detection of an overload current, a release lever rotatably supported by an adjusting link and rotating according to a shifter displaced in response to the bending of the main bimetals, and a contact reversing mechanism for change-over contacts responsive to a rotation of the release lever. The main bimetal, release lever and contact reversing mechanism are disposed in the case. The contact reversing mechanism has a movable plate, and a reversing spring stretched between the other side of the movable plate and a spring support. The other end of the movable plate and the spring support is positioned opposite a support point. The release lever has a release lever supporting part, a reversing spring pushing part, a cam contact part, and a displacement input part, in which the release lever supporting part is pivoted on the adjusting link.

Abstract: A thermal overload relay includes main bimetals which bend upon detection of an overload current; a release lever displaced via movement of a shifter moved in response to the bending of the main bimetals; and a contact reversing mechanism for changing-over contacts responsive to a rotation of the release lever. The main bimetals, the release lever and the contact reversing mechanism are all disposed in a case. The contact reversing mechanism includes a pivotable movable plate; a reversing spring reversing the movable plate by coupling with a rotated release lever; and an interlock plate rotating around a support shaft together with the movable plate. Each contact has a normally opened contact piece and a normally closed contact piece and is disposed respectively in the vicinity of a front surface and in the vicinity of a back surface of the interlock plate.

Abstract: A thermal overload relay is provided with an external case, and an adjustment dial with a cam inserted into an adjustment dial insertion hole provided in the external case for adjusting a settling current. A press-fitting section is provided at one of the adjustment dial and the adjustment dial insertion hole, and a locking section is provided at the other of the adjustment dial and the adjustment dial insertion hole. The press-fitting section is press-fit and retained in the locking section.

Abstract: A thermal overload relay device has a mechanism that allows the interphase pitch between connection lines to be readily changeable without using a jig or the like in the work for electrically connecting the thermal overload relay to different types of electromagnetic contactors, thereby reducing the maintenance cost. The mechanism comprises a connection line-holding structure disposed in a casing and holding the connection lines, while permitting the distances between the connection lines to be readily changeable between among at least two different interphase pitches.

Abstract: A thermal overload relay includes a main bimetal for detection of an overload current, a shifter associated with the main bimetal, a release lever working according to a displacement of the shifter, a contact reversing mechanism for changing-over contacts by reversing action caused by rotation of the release lever, and a manipulation structure for manipulating the release lever and the contact reversing mechanism. The manipulation structure includes a reset bar for returning the contact reversing mechanism to an initial state. The reset bar is arranged to change-over between a manual reset state in which the reset bar can be pushed-in and an automatic reset state in which the reset bar is pushed-in and turned from the manual reset state and held in that state.

Abstract: A thermal overload relay has a case, a main bimetal bending upon detection of an overload current, a release lever rotatably supported by an adjusting link and rotating according to a shifter displaced in response to the bending of the main bimetals, and a contact reversing mechanism for change-over contacts responsive to a rotation of the release lever. The main bimetal, release lever and contact reversing mechanism are disposed in the case. The contact reversing mechanism has a movable plate, and a reversing spring stretched between the other side of the movable plate and a spring support. The other end of the movable plate and the spring support is positioned opposite a support point. The release lever has a release lever supporting part, a reversing spring pushing part, a cam contact part, and a displacement input part, in which the release lever supporting part is pivoted on the adjusting link.

Abstract: A thermal overload relay includes main bimetals which bend upon detection of an overload current; a release lever displaced via movement of a shifter moved in response to the bending of the main bimetals; and a contact reversing mechanism for changing-over contacts responsive to a rotation of the release lever. The main bimetals, the release lever and the contact reversing mechanism are all disposed in a case. The contact reversing mechanism includes a pivotable movable plate; a reversing spring reversing the movable plate by coupling with a rotated release lever; and an interlock plate rotating around a support shaft together with the movable plate. Each contact has a normally opened contact piece and a normally closed contact piece and is disposed respectively in the vicinity of a front surface and in the vicinity of a back surface of the interlock plate.

Abstract: A thermal overload relay has an actuator mechanism that generates an operating force by bending of a main bimetal with a heating wire wound thereon; a switching mechanism that is driven by the operating force from the actuator mechanism; a contact changeover mechanism wherein contacts are changed by the switching mechanism operation; and a casing that contains the actuator, the switching and the contact changeover mechanisms. The casing has main circuit terminals and auxiliary circuit terminals arranged on one side, the main circuit terminals electrically connecting the thermal overload relay to an electric load device, and the auxiliary circuit terminals electrically connecting the thermal overload relay to another electric device. When the casing is viewed in plan, the main circuit terminals are aligned and, the auxiliary circuit terminals are arranged in a position offset from the position of the alignment of the main circuit terminals.

Abstract: A thermal relay includes an outer casing; an adjusting dial for adjusting a setting current value; and a cover for avoiding an erroneous operation. The cover is attached to the outer casing to cover the adjusting dial. A chamfer is provided on each of a peripheral surface of a back surface of the cover and a peripheral surface of a top surface of the adjusting dial. The chamfer on the peripheral surface of the back surface of the cover and the chamfer on the peripheral surface of the top surface of the adjusting dial are engaged with each other.

Abstract: A thermal overload relay is provided with an external case, and an adjustment dial with a cam inserted into an adjustment dial insertion hole provided in the external case for adjusting a settling current. A press-fitting section is provided at one of the adjustment dial and the adjustment dial insertion hole, and a locking section is provided at the other of the adjustment dial and the adjustment dial insertion hole. The press-fitting section is press-fit and retained in the locking section.

Abstract: A thermal overload relay includes an inversion operation mechanism that is driven by a releasing lever to open or close a contact. The inversion operation mechanism includes a movable plate supported at one end so as to be inverted, and a tension spring for driving the movable plate for inversion. The releasing lever presses a middle of a wire of the tension spring to drive the movable plate for inversion. A projection is formed in the middle of the wire of the tension spring to contact with the releasing lever. Thus, a stable inversion operation can be made regardless of the positioning of an adjustment dial.