Abstract: A thermal protector has superiority in current responsiveness or thermal responsiveness with a simple configuration that does not need a separate manufacturing step of incorporating a resistor. At a stage of press processing for cutting from an original material, a movable plate body part of a movable plate is partitioned into a narrow-width part and a wide-width part by a slim hole. The movable plate is assembled to a fixed conductor with columns of an insulator, a bimetal is assembled to the movable plate, the entire configuration is pressed down by a resinous block, and the entire fixing part is fixed by melting tips of the columns. The wide-width part serves as a normal movable plate, whereas the narrow-width part serves as a conductor in a normal state and as a resistor against an overcurrent.

Abstract: A rocker switch unit (1) with fuse comprising a housing (2); a rocker switch (3) lodged pivotally in the housing (2); at least a fuse lodged in the housing (2) and at least two connection elements (9) for connecting the rocker switch unit (1) with an external apparatus, wherein the two connection elements (9) are connected to each other by the fuse, when rocker switch (3) is in an ON-position. According to the invention the housing (2) provides at least one blind hole (4) for accommodating the fuse, wherein one terminal of the fuse serves as a first connection element for connecting the rocker switch unit (1) with the external apparatus. The rocker switch unit 1 can be used in any apparatus, in a network filter or as IEC entry plug.

Abstract: Embodiments provide a circuit breaker having a relatively low instantaneous current level at tripping. The circuit breaker includes a tripping mechanism coupled to a moveable electrical contact, the tripping mechanism including a tripping unit having a magnet, a bimetal member extending alongside of the magnet and having a moveable end, and an armature including an engagement portion being moveable as a result of motion the moveable end to trip the circuit breaker upon exceeding an instantaneous current level, and either the armature or the bimetal member includes a non-magnetic separating piece preventing a magnetic short circuit. System and method aspects are provided, as are other aspects.

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 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: An installation switching device includes a housing, a main contact point having an arc quenching chamber, an input terminal, an output terminal, an impact-style armature system configured to move the main contact point to an open position, a latching mechanism having a latching point and configured to open an isolating contact point disposed in a secondary current path parallel to a main current path, a main thermostatic bimetallic strip configured to act on the latching point to as to cause the main contact point to remain in the open position, a current limiting resistor disposed in the secondary current path, a selective thermostatic bimetallic strip disposed in the secondary current path and configured to act on the latching mechanism, a handle configured to act on the latching mechanism so as to open and close the main contact point, and a phase connecting rail.

Abstract: A thermal and/or magnetic overload trip device for an electrical switching device having multiple poles includes a housing having a housing member configured to receive a plurality of functional elements and being at least partially closable. The overload trip device further including a conductor strap associated with each of the multiple poles, each conductor strap having an associated housing portion, and a rotatable trip shaft configured to rotate between a rest position and an actuating position so as to trip an associated switching mechanism. The overload trip device further including at least one rotatable adjusting element configured to set the at least one of the presettable thermal threshold and the presettable magnetic threshold. Further, the housing member is configured so that the functional elements is insertable therein and is couplable to the housing member.

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 method for adjusting a trip sensitivity in a thermal overload protection apparatus, including setting an adjusting reference point; measuring a normal position of bimetals; measuring a moving distance at a time of trip operation of a trip latch mechanism; deciding an assembling position of a shifter mechanism based on the measured moving distance at the time of trip operation of the trip latch mechanism, information on a trip distance between a pre-determined shifter mechanism and the trip latch mechanism and information on a size of the shifter mechanism; conducting a predetermined overcurrent to the thermal overload protection apparatus; measuring a conducting time of the overcurrent until a trip event; calculating a difference between the conducting time measured in the measuring step and a predetermined trip time by converting a rotation angle; and marking a graduation of a set trip operation current by the rotation angle calculated in the calculating step.

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 trip apparatus capable of minimizing inferiority caused by variations during manufacturing of an adjusting means and simply adjusting sensitivity by duplicating the means for adjusting a sensitivity to a trip operation current, comprising: a trip mechanism driven to a trip position by a driving force from a shifter mechanism on occurrence of an overload in a circuit; a release lever mechanism for driving the trip mechanism to the trip position by pressing it when there is the driving force from the shifter mechanism or for releasing the trip mechanism when there is no driving force, on occurrence of the overload in the circuit; an adjusting lever for operating the release lever mechanism to be horizontally moved by rotation; an adjusting knob having an upper surface having a setting groove and a lower portion having a cam portion; and a means independently adjusting the sensitivity to the trip operation current regardless of manipulation of the adjusting knob.

Abstract: A switch includes a body and a switch member pivotably engaged with the top opening of the body. A link has one end pivotably connected to a first end of the switch member and the other end of the link is movably received in a guide path is defined in the body. The second end of the link is located at an inner periphery of the guide path when the switch member is in “ON” position to let two contact points be in contact with each other, and a space is defined between the second end of the link and the outer periphery of the guide path so that the second end of the link is allowed to move toward the outer periphery when a contact portion is deformed upward when overloaded.

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 trip unit in a miniature circuit breaker having a plurality of stacked bimetal elements welded front-to-back at one end and attached to a load terminal. The bimetal elements are made of similar compositions and have the same thickness. The free ends are connected to a yoke and to a pigtail that is optionally wound around the yoke in which the bimetals are received. The pigtail is connected to the conductive blade of the trip unit. To attach the pigtail from one direction, a notch is formed in the free end of one of the bimetals, exposing part of the other bimetal behind it. Or, two notches are formed in a staggered relationship such that the pigtail connections can be made from either direction. The stacked relationship of the bimetal elements allows the overall width of the circuit breaker to be reduced without sacrificing its rating requirements with one bimetal.

Abstract: An electrical receptacle has multiple thermal sensors, each of which can trigger automatic shut off when the temperature rises above a predetermined threshold. After automatically turning off, the receptacle remains permanently non-conducting.

Abstract: A thermally activated circuit interrupter (10) has a cantilever mounted, snap acting thermostatic disc (16) mounting a movable electric contact (18) that is adapted to move between a contacts engaged position and a tripped, contacts disengaged position. A pivot member (24) is rotatably mounted above the thermostatic disc and movably mounts a latch (26d) that is biased by spring arm (26a) against the edge of the free end of thermostatic disc (16) in the contacts engaged position and is moved under the thermostatic disc when the disc moves to the contacts disengaged position. An arm (24b) of the pivot member transfers motion to a trip indicator button (32) pushing the button to an exposed position upon rotation of the pivot member when the thermostatic disc moves to the tripped configuration and the latch moves under the disc.

Abstract: A circuit breaker is disclosed. The circuit breaker has a single pole module housing having a 1 W width with a first conduction path and a second conduction path disposed within the single pole module housing. The first and second conduction paths are electrically isolated from each other via an interior wall of the single pole module housing. A first activation mechanism is in operable communication with the first conduction path and a second activation mechanism is in operable communication with the second conduction path. The first activation mechanism is in operable communication with the first conduction path independent of the second activation mechanism and the second conduction path. The second activation mechanism is in operable communication with the second conduction path independent of the first activation mechanism and the first conduction path.

Abstract: A safety switch has a casing, a first circuit prong, a second circuit prong, a switch contact, a rocker, an arm and a latch. The first and second circuit prongs are mounted in and extend through the casing. The switch contact bends upward when temperature of the switch contact increases, is mounted on the first circuit prong and has a distal end selectively contacting the second circuit prong. The rocker is pivotally mounted on the casing and has a deactivating end and an activating end. The arm is formed on and protrudes down from the activating end and connects to the distal end of the switch contact. The latch is mounted in the cavity and selectively locks the arm to prevent the distal end of the switch contact from contacting the second circuit prong as the temperature drops. The safety switch may be used in severely cold environments.

Abstract: A protection mechanism includes a first member connected to a switch member pivotably connected to an open top of a case so as to lift a bimetallic plate when the switch device is set to an “OFF” status, and a second member that is pivotably connected to an extension board extending form the switch member. The second member is located above the bimetallic plate and pushes the bimetallic plate downward to set the switch device to an “ON” status. The second member can be pivoted counter clockwise when the bimetallic plate is deformed upward and will not stop the deformation of the bimetallic plate.

Abstract: An overload protection switch has a conductor interconnecting the first primary leg and a second primary leg so that when current passes through the switch, the current not only raises the temperature of the bi-metal plate, but also raises the temperature of the conductor to enhance the deformation of the bi-metal plate such that the electrical appliance connected to the switch and having an ampere tolerance lower than that of the bi-metal plate is protected.

Abstract: A safety switch comprises a hollow body having an opening and a lower end of the hollow body having three slots; a button pivotally installed upon the opening; a first power terminal installed at one of the three slots; a second power terminal installed at another of the three slots; a load terminal installed at the other slot of the three slots; an elastomer being a U shape metal piece; one end of the elastomer being buckled to an upper end of the load terminal and another end thereof being buckled to the press block of the button; and a metal sheet being installed at a lower side of the button; the metal sheet being made of a compound metal having materials of different expansion coefficients; one end of the metal sheet being connected to the a power terminal; and another end thereof being installed with a conductive silver sheet.

Abstract: A switching device in which the intermediate part of shape-memory-alloy wire (17) is retained by actuator (9) connected to one end of link mechanism (4), and both ends of shape-memory-alloy wire (17) are fixedly retained by printed-circuit board (13). Both end parts of shape-memory-alloy wire (17) are fixed on printed-circuit board (13). This shape-memory-alloy wire (17) generates heat due to electric power supplied from the circuit, generates the shape-memory effect to deform. This causes actuator (9) to operate. On this occasion, because the electrically connected part is fixed, even for frequent repetitive operations, damage due to fatigue does not occur, thus improving reliability. In addition, the device can be simplified because it dispenses with a separate part such as a current-carrying wire, and not requiring a process such as an installation work for current-carrying wires offers low-cost switching devices.

Abstract: A switch includes a casing and a push member movably connected to atop of the casing. A path is defined in the casing and a guide pin is pivotably connected to the push member wherein the guide pin includes an insertion that is movably engaged with the path. A driving plate is pivotably connected to the casing and includes an aperture through which the insertion extends. A free end of a bimetallic plate is held by a hook portion of the driving plate. The bimetallic plate includes a contact point which contacts the other contact point on a terminal by pushing the push member and the insertion rotate the driving plate in the aperture. When the current is overload, the deformation of the bimetallic plate rotates the driving plate at the hook portion of the bimetallic plate.

Abstract: An overload prevention plug structure has a power line, a plug and an overload shift. The power line has a hot wire and a ground wire. The plug has a hot wire pin and a ground wire pin. The ground wire pin is electrically connected to the ground wire of the power line. The overload shift has a hot wire contacting portion and a pin contacting portion. The hot wire contacting portion is electrically connected to the hot wire of the power line and the pin contacting portion is electrically connected to the hot wire pin of the plug to establish an electric connection. The overload has a dual metal piece that deforms and bends as its temperature increases. Alternatively, the overload is a positive temperature coefficient (PTC) thermstor with a resistance that increases or decreases as its temperature increases or decreases.

Abstract: An electric switch having a circuit breaker includes a manually operable actuator that moves one contact between a first and a second position. A bimetal member moves another contact between a first and a second position in response to an electric current above a given threshold passing therethrough, and the movement of this contact to the second position releases a catch that retains a spring loaded indicator in its retracted position. The two contacts abut one another closing the circuit when both contacts are in their first positions. An excessive current will therefore break the circuit and release the indicator to move to the extended position. The releasable catch resets after the bimetal member has cooled and it will again retain the indicator in the retracted position when it is subsequently manually depressed.

Abstract: A pushbutton assembly includes a housing and a button slidable with respect to the housing. A positioning disk is pivotally connected to the housing and has a positioning hole to receive therein a bent of a positioning rod which is pivotally connected to the button. After a resilient plate is connected to two first contacts of a first terminal, the resilient plate is deformed. The resilient plate further has a contact selectively connected to a second contact which is received in the housing such that movement of the button drives the bent to reciprocally move from a first position to a second position so that a reaction plate of the resilient plate is reciprocally deformed to selectively connect the contact to the first contact.

Abstract: A circuit breaker switch is disclosed, including a rocker, an actuator, and a dielectric separator element. The rocker is positionable between a first on position and a second off position. The actuator element is coupled to the rocker such that it causes a first electrically conductive contact portion to move into contact with a second electrically conductive contact portion when the rocker is in the on position. The dielectric separator element is urged between the first and second electrically conductive contact portions in the event of excess current being passed between the first and second electrically conductive contact portions.

Abstract: A circuit breaker includes a rectangular box-shaped intermediate housing and lower housing; a power supply side fixed contact and a load side fixed contact disposed in the intermediate housing and facing each other; and a movable contact housed in the lower housing for bridging the power supply side fixed contact and the load side fixed contact. The lower housing has arc gas emission holes formed in front and rear walls thereof, and is connected to a lower part of the intermediate housing via an engagement part such that the lower housing covers the lower part of the intermediate housing. A thin wall portion is formed in each of the front and rear walls to eject arc gas by bending.

Abstract: An electric switch having a circuit breaker includes a manually operable actuator that moves one contact between a first and a second position. A bimetal member moves another contact between a first and a second position in response to an electric current above a given threshold passing therethrough, and the movement of this contact to the second position releases a catch that retains a spring loaded indicator in its retracted position. The two contacts abut one another closing the circuit when both contacts are in their first positions. An excessive current will therefore break the circuit and release the indicator to move to the extended position. The releasable catch resets after the bimetal member has cooled and it will again retain the indicator in the retracted position when it is subsequently manually depressed.

Abstract: The circuit breaker current/time characteristic value at which the bimetal in a thermal trip assembly actuates a trip mechanism is adjusted by an adjustable coupler that includes first and second pivoted members separately rotatable about a common pivot axis. Deflection of the bimetal by an overload current causes rotation of the first pivoted member, which is coupled by a coupling member extending parallel to the common axis into the second pivoted member which rotates to actuate the trip mechanism. A positioner moves the coupling member toward and away from the common pivot axis to adjust the amount of deflection of the bimetal needed to actuate the trip mechanism.

Abstract: A circuit breaker includes a housing having a rim defining an open top and having a closed bottom defining two slots. A button is pivotally connected to the housing at the open top and is pivotal relative to the housing between two extreme positions. A first blade and a second blade extend from the interior to the exterior of the housing through the slots. A bimetallic strip is held in place in the housing and engaged with the second blade. The bimetallic strip has a U-shaped groove surrounding a tongue portion of the bimetallic strip. The tongue portion is normally engaged with the first blade. Additionally, the button has two legs configured so that the tongue portion of the bimetallic strip may be sandwiched between the legs whenever the button is in any angular position between the two extreme positions.

Abstract: A safety switch includes a casing having a first terminal plate having a first contact point and a second terminal plate to which an end of a bi-metal plate is connected. A second contact point is connected to the bi-metal plate. A movable member is movably engaged with the casing and has two protrusions from an inside of the movable member. The other end of the bi-metal plate is movably located between the two protrusions. The movable member can be easily connected with different types of switch members.

Abstract: A switch includes an N-shaped spring which is connected between an inside of the base of the switch and an end of a bimetal plate. The bimetal plate has a contact point and is pushed to let the contact point contact an another contact point on one of three terminal plates. An adjusting member is movably engaged with the base and contacts an end of the N-shaped spring so as to adjust the position of the N-shaped member.

Abstract: A circuit breaker includes a housing having a rim defining an open top and having a closed bottom defining two slots. A button is pivotally connected to the housing at the open top and is pivotal relative to the housing between two extreme positions. A first blade and a second blade extend from the interior to the exterior of the housing through the slots. A bimetallic strip is held in place in the housing and engaged with the second blade. The bimetallic strip has a U-shaped groove surrounding a tongue portion of the bimetallic strip. The tongue portion is normally engaged with the first blade. Additionally, the button has two legs configured so that the tongue portion of the bimetallic strip may be sandwiched between the legs whenever the button is in any angular position between the two extreme positions.

Abstract: A safety switch is constructed to include two metal contact plates, a bimetal contact plate suspended from one metal contact plate, a switching handle, a push and pull bar pivoted to the switching handle and driven by the switching handle to move the bimetal contact plate between the “On” position and the “Off” position, and a S-shaped metal spring plate adapted for supporting and guiding movement of the push and pull bar for enabling the bimetal contact plate to trip off automatically upon an overload despite of the positioning of the push and pull bar or the switching handle.

Abstract: A safety switch is constructed to include two metal contact plates, a bimetal contact plate suspended from one metal contact plate, a switching handle, a push and pull bar pivoted to the switching handle and driven by the switching handle to move the bimetal contact plate between the “On” position and the “Off” position, and a S-shaped metal spring plate adapted for supporting and guiding movement of the push and pull bar for enabling the bimetal contact plate to trip off automatically upon an overload despite of the positioning of the push and pull bar or the switching handle.

Abstract: The invention relates to a circuit breaker having a crossbar (7) that is supported swingably onto a base (1B) to hold swingably movable contacts (4), and has the small reduction of overtravel in the elapsed years, and can reduce its size. The bending modulus of elasticity Eb, Ec of the base (1B) and the crossbar (7) at the ordinary temperature/ordinary humidity satisfy following relationships Eb+Ec≧17000 MPa  (1) 8000 MPa≦Eb  (2) 9000 MPa≦Ec  (3).

Abstract: A switch device includes a switch case having a passage in a top thereof so as to receive a button therein. A non-conductive plate extends laterally from the button. A first terminal plate and a second terminal plate respectively extend from the casing. A first contact point extends from a side of the second terminal plate. A bimetal plate is connected to the first terminal plate and has two legs extending therefrom. A conductive member is connected between the two legs and connected to the second terminal plate when the button is pushed. The non-conductive plate is located between the conductive member and the second terminal plate when the button jumps up and the two legs are deformed away from the second terminal plate.

Abstract: An improved structure of a depress-type safety switch comprising a main body, press button, actuating block, the top section of the main body being opened to accommodate the press button and the actuating block, and the bottom panel being provided with a left, center and a right terminal for connection to a socket and a power source wire, the interior of the actuating block being provided with a main spring, characterized in that the right side of the actuating block is a top section with a positioning slot having a V-shaped engaging block, and the right terminal is connected upward to a bi-metallic engaging plate made from two metals of different properties, the top end of the engaging plate is a fastening peg extended to the positioning slot of the actuating block, thereby the depression of the press button allows the fastening of a fastening peg at the bi-metallic engaging plate with the engaging block to form a closed circuit, and if the current is overload or a short circuit is formed as a insult of high

Abstract: A safety press-button switch includes a linkage formed of a lever and a switching rod pivoted together, and a press-button cap having a push rod and a hook arm respectively aimed at the switching rod and a positioning rod of the lever and adapted to force the lever to shift a bimetal plate from OFF position to ON position and to hold the lever in position after the bimetal plate switched on, the positioning rod of the lever being forced away from the hook arm by the deformation force of the bimetal plate for enabling the bimetal plate to trip off automatically upon an overload.

Abstract: An indicator light which when installed in combination with either a circuit protector or a fuse, etc., will automatically illuminate to notify a user that an electrical overload has occurred.

Abstract: An advanced circuit breaker system and method includes first and second terminals to electrically couple the advanced circuit breaker to an electrical circuit. A cam applies a first torque to a rotatable contact arm, having an arm contact electrically coupled to the first terminal, from a first position to a second position of the contact arm and a second torque to the contact arm from the second position to a third position. A bimetal blade, having a blade contact electrically coupled to the second terminal, changes shape when electrical current flowing through it exceeds a threshold for at least a predetermined amount of time. The arm contact maintains contact with the blade contact when the first torque occurs and separates from the blade contact when the second torque occurs. The blade contact changes shape to increase separation from the arm contact if electrical current exceeds at least a certain amount above the threshold.

Abstract: An advanced circuit breaker system and method includes first and second terminals to electrically couple the advanced circuit breaker to an electrical circuit. A cam applies a first torque to a rotatable contact arm, having an arm contact electrically coupled to the first terminal, from a first position to a second position of the contact arm and a second torque to the contact arm from the second position to a third position. A bimetal blade, having a blade contact electrically coupled to the second terminal, changes shape when electrical current flowing through it exceeds a threshold for at least a predetermined amount of time. The arm contact maintains contact with the blade contact when the first torque occurs and separates from the blade contact when the second torque occurs. The blade contact changes shape to increase separation from the arm contact if electrical current exceeds at least a certain amount above the threshold.

Abstract: A safety switch includes a casing having a first terminal plate having a first contact point and a second terminal plate to which an end of a bi-metal plate is connected. A second contact point is connected to the bi-metal plate. A movable member is movably engaged with the casing and has two protrusions from an inside of the movable member. The other end of the bi-metal plate is movably located between the two protrusions. The movable member can be easily connected with different types of switch members.

Abstract: An electrical switch comprises a housing in which at least two power source terminals and a conductive piece are disposed such that the conductive piece is fastened at one end with one of the two power source terminals for electrically conducting or interrupting the two power source terminals. The conductive piece is connected with a link structure by which an external force causes the conductive piece to make contact with or separate from other one of the two power source terminals. A spring piece is fastened at one end with the housing and at other end with the link structure. The spring piece enables the conductive piece to jump so as to separate from other one of the two power source terminals at the time when the conductive piece is overheated.

Abstract: The high transient current sustained by arcing during opening of the main contacts of a miniature circuit breaker is commutated out of the bimetal by deflection of the bimetal in response to the overcurrent to close secondary contacts on the free end of the bimetal and on a low resistance by-pass conductor shunting the bimetal. The by-pass conductor can be extended toward the movable contact arm carrying the movable main contact to commutate some of the overcurrent into the by-pass conductor earlier in the opening sequence to reduce the energy input to the bimetal and reduce the force closing the secondary contacts.

Abstract: A push-button switch with overload protection is disclosed. The switch comprises a housing, a conducting unit, and an actuating unit. The conducting unit comprises several terminals, a normal-open first conducting leaf and a thermally deflecting bimetal sheet. The bimetal sheet is of a U shape having a working end and an opening end. The working end can deflect to an overload position from a normal position in the event of overload. The actuating unit comprises a stem, a positioning means, a rocking lever, an enabling lever, and a lever reseating member. By means of the above structure, a trip action could be assured no matter what happens on the stem.

Abstract: The present invention relates to a universal device for safety switches which is used to control a conductive strip and serves as On/Off switching agent. The attachment is slopingly mounted in the switch housing. And the push-pull body used to move the conductive strip includes a pull body and an inclined spring element above the pull body. The pull body is in a free state when the conductive strip bounces upward into a deforming position. As a result, the attachment is not connected with the conductive strip; however, they are in a pull-push switching relationship such that the conductive strip is collapsible in a manner of reverse deformation for an electric disconnection in case of overload without restraint of the push-pull body of the attachment. During the ordinary state, the conductive strip maintains the usual (On/Off) switching function. Accordingly, the present invention is applicable to all kinds of safety switches for reaching a multipurpose effect of one object.

Abstract: A service switching device is described. The service switching device has a thermal release, an electromagnetic release, a switching mechanism with a latching point, a contact point with a moving contact piece and a stationary contact piece. When an over-current condition occurs, the thermal release unlatches the latching point so that the contact points are opened permanently and, when a short-circuit current occurs, the electromagnetic release moves the moving contact piece to the open position. The service switching device has a housing and an associated actuator in the form of a piezoelectric bending strip, which likewise acts on the latching point in order to open the contact point permanently, with a fault current detection device being provided, whose output signal drives the actuator when a fault current occurs.