Abstract: Various implementations described herein are directed to a method for detecting, by a device, an increase in temperature at certain parts of an electrical system, and taking appropriate responsive action. The method may include measuring temperatures at certain locations within the system and estimating temperatures at other locations based on the measurements. Some embodiments disclosed herein include an integrated cable combining electrical conduction and heat-detection capabilities, or an integrated cable or connector combining electrical conduction with a thermal fuse.

Abstract: A thermal limiter system for an electric motor includes a thermal limiter fuse having a hollow contact element anchored by solder to at least one of first and second terminals of the fuse. A coaxial spring element causes the hollow contact element to slidably release and separate from one of the first and second terminals due to overheating of the solder that is not caused by a flow of electrical current. The system also includes stator mounting blocks and a stator cooling jacket for a motor to be thermally protected.

Abstract: A circuit protection device includes a substrate with first and second electrodes connected to the circuit to be protected. The circuit protection device also includes a heater element between the first and second electrodes. A sliding contact is connected by a sensing element to the first electrode, second electrode, and heater element, thereby bridging and providing a conductive path between each. A spring element is held in tension by, and exerts a force parallel to a length of the substrate against, the sliding contact. Upon detection of an activation condition, the sensing element releases the sliding contact and the force exerted by the spring element moves the sliding contact to another location on the substrate at which the sliding contact no longer provides a conductive path between the first electrode, second electrode, and heater element.

Abstract: A modular by-pass device of an electrical component includes a housing possessing a movable means of sealing, and is equipped with conducting terminals, one of whose ends is connected to one of the terminals of the electrical component circuit, the other end being fastened to the wall of the housing projecting into the interior of the housing and constituting a contact post. An actuator providing transposition between two positions of a control device include a plunger shaft and a spring arranged in the space formed between the plunger shaft and the internal wall of the housing. A trigger includes a retention device of the plunger shaft held in place by a fusible material. A reversing switch includes a contact zone providing electrical continuity between two contact posts of the terminals carried by the housing. The disclosed embodiments finds application more particularly in the isolation and short-circuiting of a battery element, which has become defective.

Abstract: A fuse including a fuse housing having first and second electrical terminals, a movable partition made from an electrically conductive material movably disposed within the fuse housing, a fusible structure connected between the first electrical terminal and the movable partition, a conductor connected between the movable partition and the second electrical terminal, a biasing element acting on the movable partition to maintain the fusible structure in tension and for moving the movable partition upon melting of the fusible structure and an indicator connected between the movable partition and the second electrical terminal.

Abstract: In the present invention, a physical and chemical property of thermosensitive material is noted in selecting and using thermosensitive material to provide a noble and improved thermal fuse using thermosensitive material. To achieve this object, the present thermal fuse includes: a thermosensitive material formed of thermoplastic resin fusing at a prescribed temperature; a cylindrical enclosure accommodating the thermosensitive material; a first lead member attached at one opening of the enclosure, forming a first electrode; a second lead member attached at the other opening of the enclosure, forming a second electrode; a movable conductive member accommodated in the enclosure and engaged with the thermosensitive material; and a spring member accommodated in the enclosure, and pressed against and thus acting on the movable conductive member. When the thermosensitive material fuses at an operating temperature an electrical circuit between the first and second electrodes is switched.

Abstract: When an ignitor 29 is ignited by an abnormal signal sent from outside, a heating agent 27 charged into a thermite case 26 is heated, a retainer 45 is melted by the heat, a compression spring 39a is expanded to allow the thermite case 26 to move up. Therefore, electrical connection between the thermite case 26 and each of a first bus bar 11a and a second bus bar 19a is interrupted. Thus, it is possible to reliably interrupt a circuit within a short time. Further, a low-melting metal 28 mounted to an intermediate portion of the second bus bar 19a is blown out by heat caused by a current flowing through the second bus bar 19a to interrupt the circuit. Therefore, even if an abnormal signal is not sent to the ignitor 29 due to failure of a control circuit or the like, it is possible to reliably interrupt the circuit.

Abstract: A circuit breaker includes: a heating portion charged with heating agent and having a conductivity which is arranged between a first connecting terminal connected to a power source side and a second connecting terminal connected to a load side; an ignition portion for causing the heating agent charged in the heating portion to generate heat by igniting an ignition agent; an expandable/contractable elastic member arranged near the heating portion or in contact with the heating portion and pressing the heating portion; an outer container receiving the elastic member, the ignition portion and the heating portion; a pressing operation restricting member preventing the elastic member from being pressed to the heating portion which is melted due to heat of the heating agent; and a heat conduction member bringing any one of the first connecting terminal and the second connecting terminal into contact with the ignition portion.

Abstract: A current sensor 73 detects a current flowing through a first buss bar 11. When a current value detected by the current sensor 73 became equal to or greater than a threshold current value, a CPU 74 outputs a driving control signal to a driving circuit 77, and the driving circuit 77 operates an, ignitor 29 through a second substrate 65 and a terminal 50. Therefore, the ignitor 29 ignites, a second projection 41 is melted by heat of a heating agent 27, a compression spring 34 is expanded and a thermite case 26 jumps up. Thus, electrical connection between the thermite case 26 and the first and second buss bars 11, 19 is interrupted.

Abstract: A circuit breaker device including a first connection terminal, a second connection terminal, a heating portion electrically interconnecting the first connection terminal and the second connection terminal, and a claw lockingly engaged with the heating portion. The claw is configured to be melted by the heating portion to allow the heating portion to move apart from the first connection terminal and the second connection terminal for electrical disconnection.

Abstract: A fusion apparatus is equipped with a fuse, a solid combustion agent, an igniting device, and a spring. The solid combustion agent and the igniting device are accommodated within an inner casing. The inner casing is disposed in the vicinity of, or in contact with, the fuse. The inner casing and the fuse are covered by an outer casing. The spring is disposed between the outer casing and the inner casing and urges the inner casing containing the solid combustion agent therein toward the fuse. When the igniting device receives a current supplied from the outside, the solid combustion agent is combusted by the ignition made by the igniting device and the resulting combustion heat softens the fuse. At this time, since the inner casing is pressing the fuse by means of the spring, the fuse is easily broken.

Abstract: An electrically conductive contact pin having a temperature fuse function includes an electricity conducting element formed in an approximately cylindrical shape divided into an electrode contact portion and an outer electric contact portion, a holding body for holding the electricity conducting element provided around the outer electric contact portion such that the holding body may slide along the surface of the outer contact portion, a pressing member for pressing the outer electric contact portion upward provided between the holding body and the electrode contact portion, and an actuator for actuating to expand the distance between the electrode contact portion and the outer electric contact portion upon melting of the heat sensitive electrically conductive melt body. The electrically conductive contact pin may be consisted of two electricity conducting route by having a measurement element inside.

Abstract: A thermal fuse which interrupts at least one current path which runs through it when a triggering temperature value is exceeded, with a fuse housing in which at least two thermal fuse elements are arranged and from which at least two connection contacts project for forming at least one current path, where a closed contact segment is bridged in the interior of the housing, via a movement contact when the fuse has not responded, and a fuse element puts spring stress on the movement contact assigned to it, in the contact closing direction, which contact interrupts at least one current path when triggered, characterized in that the fuse housing is formed in a pipe shape and has two holder chambers for insertion of the thermal fuse elements, which are separated from one another by a partition floor which essentially closes off the cross-section of the pipe and that the thermally sensitive elements of at least two thermal fuse elements impact the partition floor.

Abstract: This invention provides a switch adapted to close upon pressing by an actuator of a movable piece initially in an open switch position, the actuator being made of a material which melts at a predetermined temperature. The switch opens when melting of the actuator by the heat generated from an overcurrent allows the movable piece to return to its initial position. The movable piece is made of a material which fuses at a predetermined temperature, such that the switch opens upon fusion of the movable piece by the heat generated from the flow of an overcurrent through the movable piece.

Abstract: A thermal cutoff having a mushroom-shaped floating contact member with an enlarged head and an elongated shank. The outwardly facing end of the enlarged head has a centrally located depression for reducing the area of the head end surface that engages a sliding contact for the purpose of increasing contact pressure and thereby reducing electrical resistance. The shank has a necked-in terminal end portion to facilitate assembly by minimizing the possibility that the shank end will hang up on a bushing that receives the shank. The head is enlarged sufficiently to accept a straight coil spring as well as a tapered coil spring.

Abstract: A thermal cutoff including a dielectric bushing having opposite ends and a hole therethrough. A wire lead received through the hole has an enlarged contact thereon adjacent one bushing end, and an enlarged deformation thereon adjacent the other bushing end. The contact and deformation prevent relative longitudinal movement between the bushing and lead.

Abstract: A thermal protector including a thermal cutoff and a device having a positive temperature coefficient of resistance, both mounted in a common housing and connected in series.

Abstract: A thermal cutoff having a metal foil resistance heater circuit bonded to its outer surface.

Abstract: The thermal cutout comprises a casing (1) in which at least a portion of casing (3) is of heat-conducting material, two terminals (5) carried by an electrically insulating plug (4) and an electrically conductive moving element (6) maintained in contact with each terminal (5) by a member (8) which is deformable under the action of heat and which is in turn in contact with the heat-conducting portion of casing (3). The cutout essentially comprises a translationally displaceable electrically insulating member (7) forming a separation between on the one hand the heat-deformable member (8) and on the other hand the terminals (5) and the electrically conductive element (6).

Abstract: A miniature thermal switch features simplified single-spring construction requiring only four components within an enclosure housing. None of the components requires subassembly, and all are designed for completely automated assembly of the finished switch. A fabrication method features self-alignment of the elements by means of closely confining barrier walls. A wiping action of the contacts during melting of a contact-restraining meltable pellet serves to insure an abrupt circuit interruption at the threshold temperature.

Abstract: A thermal cutout fuse comprises a housing, a first lead wire thrust into the housing, a movable contact connected to the first lead wire, a stationary contact disposed around the movable contact and electrically connected to a second lead wire, a coil spring having resilient force of bending elasticity large enough to support the movable contact and separate the movable contact from the stationary contact, a thermally sensitive pellet having a melting point which conforms to the preset unsafe temperature and disposed within the housing, and a solid member interposed between the thermally sensitive pellet and the movable contact and adapted to bring the movable contact into contact with the stationary contact against the bending elasticity of the coil spring.

Abstract: A single use thermal switch having a tubular casing within which a mechanical isolation cage is axially movable. The cage is normally urged by a helical compression spring against a fusible pellet which melts at a temperature at which it is desired to disconnect the electrical circuit. An electrically conductive contact member extending transversely through the isolation cage is normally urged by a helical compression spring toward one end of the cage and against the end of one electrical lead that is coaxial with the casing. The contact member is foldable along a line across its center. The force of the contact member pressed against the end of the lead urges the contact member to fold to cause the ends thereof to be forced against the inside wall of the casing to establish electrical connection between the casing and the lead through the contact member.

Abstract: A thermosensitive fuse includes a cylindrical metallic casing having one end closed and the other end opened. The closed end of the casing is connected with a first conductor that extends outwardly from the casing and the opened end is fittingly mounted with a bushing carrying a second conductor. One end of the second conductor projects into the casing and the other end extends outwardly from the casing. Provided in the casing are an organic substance of solid state from the bottom of the casing to an intermediate level thereof, a contact member of slanted cylinder having a diameter smaller than the inner diameter of the casing, a first spring extending between the organic substance and one end of the contact member in a compressed manner, and a second spring, which is weaker than the first spring, extending between the projected end of the conductor and the other end of the contact member in a compressed manner.

Abstract: A thermally actuatable electrical switch construction having a resilient contact member normally biased into electrical contact with a stationary contact member while a temperature sensitive member of the construction is in a solid condition and normally tending to spring out of contact with the stationary contact member by the natural bias of the resilient contact member when the temperature sensitive member is rendered non-solid by sensing a temperature above a predetermined temperature. The construction carries a guide member operatively associated with the resilient contact member to provide a guide for the resilient contact member that will substantially insure that the resilient contact member will move and be maintained out of contact with the stationary contact member after the temperature sensitive member has been rendered non-solid.

Abstract: A thermally actuatable electrical switch construction having a resilient contact member normally biased into electrical contact with a stationary contact member while a temperature sensitive member of the construction is in a solid condition and normally springing out of contact with the stationary contact member by the natural bias of the resilient contact member when the temperature sensitive member is rendered non-solid by sensing a temperature above a predetermined temperature, a guide member being carried by the construction and being operatively associated with the resilient contact member to provide a guide for the resilient contact member that will substantially insure that the resilient contact member will move and be maintained out of contact with the stationary contact member after the temperature sensitive member has been rendered non-solid.

Abstract: A thermal switch is described which has a pair of axial leads, one of which is electrically insulated from the conductive outer housing and the other of which is in contact with the housing. An electrically-conductive temperature-sensing pellet which is made of solder, or other conductive material, is formed into a donut shape and rests on the bottom of the housing. A donut shaped insulator rests on top of the sensing pellet to protect the pellet from excessive force on it. A ring-shaped sliding contact is placed on top of a ceramic insulator and is bowed outwardly between the ceramic insulator and a conductive disc, which is in contact with the head of the insulated lead, so as to contact the conductive outer wall of the housing. When the temperature-sensing pellet melts, the solder flows allowing the contact to relax to its undeformed state and a spring that surrounds the insulated lead then forces the contact away from the head of the insulated lead.

Abstract: This disclosure relates to a heat fuse for use in electrical and electronic equipment in which a contact plate having a diameter smaller than the internal diameter of a metallic casing is adapted to positively contact under pressure the inner peripheral surface of the metallic casing by the component force produced at the forward end of a second compression spring and applied in a direction perpendicular to the direction of the compression force. The contact plate can be pressed against the peripheral inner surface of the metallic casing with a sufficiently large contact pressure by the component force of the second compression spring, while the friction caused by the sliding movement of the contact plate with respect to the casing during functioning is extremely small owing to the diameter of the contact plate made smaller than the internal diameter of the metallic casing.

Abstract: A thermal limiter construction having a generally cylindrical housing or casing provided with an oppositely extending pair of conductor leads, one of which is insulated from the casing and the other is conductive with the casing. In the closed position, a contact engages the end of the conductor which insulated with the case. The contact has a flange member engaging the inner wall of the casing. A trip spring extends between the contact and the insulated casing end. A fusable pellet is provided in the lower end of the casing. An elastomeric member is interposed between the pellet and a contact surface and when deformed radially urges the contact flange members into tight engagement with the interior casing walls in the closed position.

Abstract: A pair of conductors in an electric switch are kept in electrical contact by a wire gripped between the conductors and a base against which the conductors are biased. A pedestal of meltable material in a well, covered by a resilient sheet, supports the base in its position. A spring urges the wire out of engagement with the conductors, and is successful when the pedestal melts and fails to support the base, the base meanwhile distorting the resilient sheet. After the disengagement of the wire from the conductors, the pedestal resolidifies in its original shape as the resilient sheet regains its configuration. A reset button is coupled to re-engage the wire with the conductors.

Abstract: A method of assembling a normally-closed ambient thermally actuated switch comprises assembling into the open end of a casing a sandwich of elements including a meltable pellet, one or more springs, a backing member and a contact arm-deforming member which is released for movement under pressure of one of the springs when the pellet is melted at a given ambient control temperature. A power lead having resilient outwardly inclining contact arms at the inner end thereof and an axially outwardly facing shoulder is positioned in the casing so that the outer sides of the arms engage the backing member and the inner sides of the arms are confronted by the contact arm-deforming member.

Abstract: A thermal cut-off fuse comprises a housing, a pair of terminals opposed to each other within the housing, a sliding means constantly urged by a spring, a thermal pellet adapted to melt at a fixed elevated temperature and remain in a solid state at normal room temperature and, by virtue of the solid state, restrain the sliding means from the forward motion imparted thereto by the spring and consequently serve to form a continuous space between the pair of terminals, and a conductive material disposed within the space to establish electric continuity between the terminals. When the ambient temperature is elevated to reach the fixed level, the thermal pellet melts, to release the sliding means and allow it to move under the force of the spring into a position where it severs the continuous space and consequently breaks the electric continuity between the two terminals.

Abstract: A thermal switch device is constructed with an electrical conductive spring cup contact that fits over a ceramic insulator which surrounds one lead of the device. The center of the spring cup contact has a pattern cut in it so that it is flexible, and a metallic, thin flat disc which is placed against the surface of the spring cup contact which forces the flexible portions of the spring cup contact into contact with the head of the lead that supports the ceramic insulator. A conductive cup-shaped housing that is open at one end encloses the entire structure and is in contact with the spring cup contact. The outer ends of the housing being pinched over the ceramic insulator at the open end. A second conductive lead is attached to the outer surface of the conductive housing.

Abstract: A resettable thermal cut-off fuse, under normal temperature condition, keeps the circuit in a closed state by allowing a switch member which is energized by a spring in the circuit-breaking direction to be joined through the medium of a thermal pellet capable of retaining a solid state under the normal temperature condition to a check means which is prevented from rotating in the spring's energizing direction. When the ambient temperature rises to a prescribed level and, consequently, the thermal pellet melts, the fuse allows the switch member to rotate in the spring's energizing direction to open the circuit. When the ambient temperature falls and returns to its normal level, the fuse can be manually reset by rotating in the circuit-making direction until it resumes firm engagement with the check means to close the circuit.

Abstract: In a thermal cut-off fuse of the class wherein electrical continuity of a contact means is maintained through the medium of a thermal pellet which is solid in its normal state and melts into a liquid state when the ambient temperature rises to reach a fixed level and the electrical continuity of the contact means, therefore, is broken by the thermal pellet being liquefied upon elevation of the ambient temperature to the fixed level, the improvement is attained by causing the thermal pellet which is in a solid state under the normal condition to restrain the movement of an actuating means kept pressed forward by an energizing means in such a way that, when the thermal pellet melts into its liquid state upon elevation of the ambient temperature to the fixed level, the thermal pellet releases the actuating means from the aforementioned restraint and enables it to thrust forward by virtue of the pressure constantly exerted by the energizing means to thereby break the electrical continuity of the contact means and

Abstract: A radial lead thermal cut-off device for opening an electrical circuit when a predetermined temperature is disclosed. Electrical connection between the radial leads is maintained by thin spring contact which is forced against the terminal heads of the leads of the device. The spring contact is forced into contact by a disc against the force of a coiled bias spring that engages the center of the spring contact. The disc is held in place by a temperature-sensing pellet of organic material which melts at a predetermined temperature and which preferably incorporates a multitude of spherical glass beads filling that greatly increase its strength. The pellet has a centrally located cavity so that when the organic material of the pellet melts the material fills a volume having a smaller transverse dimension.

Abstract: In a thermal cut-off fuse of the type in which a resilient contactor interposed between the electrodes opposed to each other inside a housing is bulged with the pressure resulting from insertion of a thermal pellet inside the housing so as to establish an electric circuit between the electrodes, desired reduction in the contact resistance between the contactor and the electrodes is accomplished by the improvement which comprises having formed on each of the opposite surfaces of the contactor confronting the opposed electrodes a plurality of raised contacts adapted so that all the raised contacts will remain in fast contact with the electrodes so long as the thermal pellet retains its solid state.

Abstract: A thermal switch in which a contact spring is formed from a flat strip of metal into a U-shape with inward extensions from the ends of the legs of the U, the outside faces of each of the legs of the U normally resiliently contacting one of a pair of parallel electrical leads. The contact spring is normally supported to contact the electrical leads by a fusible pellet and is resiliently biased by a compression spring to move parallel to the leads to break the contact when the fusible pellet melts.

Abstract: A thermal switch comprising a conductive casing defining a switch axis, a terminal connected to the casing and a terminal entering the casing in insulated relationship thereto, and within the casing a normally solid fusible pellet and a resilient contact means normally in electrically conductive relationship with the insulated terminal and which is compressed in the axial direction against said normally solid fusible pellet, whereby said contact means is normally expanded in the radially outwards direction to contact the casing and thereby establish an electrical connection between the casing and the insulated terminal, the pellet having a preselected temperature of disintegration at which it will collapse to release the axial pressure on the resilient contact means and thereby permit its radial contraction.

Abstract: A thermally sensitive switch is provided with two parallel lead wires or conductive members which are confined within a two section insulated housing. Electrical continuity between members is established by a conductive contact element which bridges the two conductive members to provide a continuous electrical path. The contact element is held in place by a temperature sensitive material which changes state at a predetermined temperature and by a spring element which exerts a force on the pellet through the contact element. When the temperature sensitive material changes state, the spring force drives the contact between the conductive members to effect a snap-action instantaneous interruption of the electrical circuit. The construction and assembly of the components provide for minimizing the production cost of the switch.

Abstract: Conductive caps are respectively put on both ends of an insulating cylindrical member and a pair of cup-shaped contactors are disposed in the insulating cylindrical member in a manner to be movable relative to each other. A repulsive force is provided by a pair of biasing elements located between the pair of cup-shaped contactors through a fusible member to electrically interconnect the conductive caps. When the fusible member is fused at a predetermined temperature, the biasing force of one of the biasing elements weakens and the biasing force of the other biasing element increases to move the pair of cup-shaped contactors toward each other, thereby to electrically disconnect the conductive caps from each other.

Abstract: A temperature responsive current interrupter in which two conductors are connected by electrically conductive, low-melting-point fusible elements respectively mounted on the conductors and a connector element interconnecting the fusible elements and urged against an electrically non-conductive high-melting-point fusible element, the connector element being moved into a position separate from at least one of the conductors when the high-melting-point fusible element is melted by heat.

Abstract: A thermally actuatable electrical switch construction having a deformable contact member normally disposed in electrical contact with a stationary contact member while a temperature sensitive member of the construction is in a solid condition and being deformed out of contact with the stationary contact member by deforming means of the construction when the temperature sensitive member is rendered non-solid by sensing a temperature above a predetermined temperature, the deformable contact member being deformed in a direction toward the temperature sensitive member by the deforming means when the temperature sensitive member is rendered non-solid and being carried by a lead that projects into the switch construction whereby the lead and the deformable contact member define a subassembly that is adapted to be initially inserted into the construction to be secured thereto.

Abstract: A thermally actuatable electrical switch construction having a conductive open ended casing receiving an insulating sleeve in the open end thereof and a lead carrying insulating end plug disposed within the sleeve to close the open end of the casing. A sealing compound seals the casing to the sleeve external to the sleeve and the casing, the sealing compound also sealing the sleeve to the lead external to the sleeve and the lead.

Abstract: A thermal fuse comprises an electrically and thermally conductive housing hermetically sealing switch parts of a fusible temperature-sensitive pellet, metallic plates, compression springs and a slidable resilient contact member. The contact member has a center contact portion at its bottom base and a peripheral contact portion with a plurality of tongues extending from the bottom base. The contact member of resilient conductive material is shaped to form a portion sloping over the bottom base and to form peripheral tongues extending relative to the flat surface of the assembled metallic plate when no external force is applied.

Abstract: A thermal switch having a tubular metal casing within which a fusible pellet normally holds an axially slidable electrical contact disk in contact with an electrical lead. The body of the electrical lead extends through a ceramic bushing and out of the casing for electrical connection, and it is formed with at least one radially-extending relief lying within the bore of the ceramic bushing. A sealing resin within the bore of the ceramic bushing and around the lead retains the lead in the bushing both in normal use and after the fusible pellet has melted and the electrical connection is broken.

Abstract: A condition-responsive, spring driven actuator characterized by a housing having disposed therein an actuator shaft supported for axial reciprocation, a helical compression spring seated in the housing and connected with the shaft for urging the shaft in displacement in a first direction along an axial path, a displaceable lever arm supported near its midportion by a fulcrum and having one end attached to the shaft for restraining the shaft against axial displacement, and a frangible bar disposed in transverse engagement with the arm securing the arm against pivotal motion, and means for separating the bar including, alternatively or concurrently, a pendulous mass concentrically related to the bar, a fusible link interposed in interconnecting relation between the opposite end portions of the bar and a pyrotechnic charge embedded in the bar and connected with an electrical circuit.

Abstract: A non-resettable heat responsive safety switch featuring two contact sleeves inside a jacket with a displaceable intermediate contact body of metal granulate, a preloaded compression spring biasing the contact body in the direction of contact interruption, a normally solid trigger body of fusible material holding the contact body in its normal, sleeve-bridging position, against the spring bias, until, at a critical temperature level, the trigger body yields to the spring which moves the contact body and breaks contact in the switch.

Abstract: Actuator means of the pressure- and/or temperature-responsive type are disclosed for controlling valve means which supply pressure fluid (such as a combustible gas) to a load (such as a gas-fired boiler), characterized in that the actuator means are operable (1) when the boiler pressure exceeds a given limit, (2) when the boiler temperature exceeds a given limit, or (3) when the temperature a given region external of the boiler exceeds a given limit. The valve means is normally in an open condition, said actuator means being operable to close the valve means when at least one of the aforementioned limits is exceeded.

Abstract: A small-sized fuse comprising lead wires supported in parallel by a heat-resisting and insulating support, a conductor bridging said lead wires with its both ends fixed to said lead wires by alloy of low fusing point, a heat-resisting elastic substance pressed against said conductor so that said conductor is urged to separate from said lead wires upon fusing of said alloy of low fusing point and a frame in which insulating filler such as insulating grease is filled.

Abstract: A thermally actuatable switch having a housing provided with a pair of leads, one of the leads having a contact and the other of the leads having a spring blade for making contact with the contact to complete an electrical circuit between the leads. The spring blade has a normal bias to move the same out of contact with the contact to open the circuit. A temperature sensitive member is carried by the housing and is adapted to collapse when the same is at a predetermined temperature. A biasing member is operatively associated with the temperature sensitive member and the spring blade to resiliently hold the spring blade in contact with the contact as long as the temperature sensitive member is in an uncollapsed condition thereof whereby the biasing member substantially compensates for any shrinkage and/or deterioration of the temperature sensitive member during its uncollapsed life and thus maintains the spring blade in contact with the contact.