Abstract: A battery pack is provided including at least one rechargeable secondary battery; a battery frame having a battery accommodation portion configured to accommodate the at least one secondary battery; a packaging member provided in the form of an adhesion sheet having an adhesive surface formed at one surface thereof, the packaging member including a body portion fixedly adhered to an upper portion of the secondary battery accommodated in the battery frame and a fixing portion bent and extended downward from the body portion and having the adhesive surface fixedly adhered to an outer surface of an outermost edge of the battery frame; and an anti-noise member attached to at least one portion of the adhesive surface of the packaging member.

Abstract: Systems, apparatuses, and methods are described for thermal fuse circuit breakers. The thermal fuses described herein may be disposed in a connector, so that, should an overheating condition occur, for example, due to an arc discharge across or inside of the connector, the heat of the arc discharge melts a portion of the fuse, thereby preventing a potentially catastrophic event, such as fire, or damage to a component which may be more expensive than the thermal fuse itself.

Abstract: [Problem] Provided is a method for manufacturing an assembly including an igniter, a projectile, and a cylinder that is easy to assemble.

Abstract: Electrical connector comprising a detection device for detecting potential overheating, which comprises an electrically conductive element and an electrically insulating element inserted between the electrically conductive element and a low-voltage line. The electrically conductive element exerts an elastic force on the insulating element. For example, the electrically conductive element is a spring. In the event of overheating, the insulating element deforms under the pressure of the electrically conductive element and enables an electrical connection between two low-voltage lines. The overheating is detected as a consequence of the electrical design of this connection between the low-voltage lines.

Abstract: A metal electrically programmable fuse (“eFuse”) includes a metal strip, having a strip width, of a metal line adjoined to wide metal line portions, having widths greater than the metal strip width, at both ends of the metal strip. The strip width can be a lithographic minimum dimension, and the ratio of the length of the metal strip to the strip width is greater than 5 to localize heating around the center of the metal strip during programming. Localization of heating reduces required power for programming the metal eFuse. Further, a gradual temperature gradient is formed during the programming within a portion of the metal strip that is longer than the Blech length so that electromigration of metal gradually occurs reliably at the center portion of the metal strip. Metal line portions are provides at the same level as the metal eFuse to physically block debris generated during programming.

Abstract: Disclosed is a fuse resistor representing superior manufacturing efficiency and assembling reliability. The fuse resistor includes a resistor, a thermal fuse that is disconnected by heat generated from the resistor, and a case receiving the resistor and the thermal fuse therein and having a space section for transferring radiant heat of the resistor to the thermal fuse. Fillers are not required so that the manufacturing process is simplified. Since the assembling process is completed by covering a body of the case with a cap after the resistor and the thermal fuse have been inserted into the body, the manufacturing efficiency is improved.

Abstract: Disclosed are a thermal fuse resistor having a case injection-molded by using thermosetting resin having heat resistance less than that of a filler, a manufacturing method of the thermal fuse resistor, and a method of installing the thermal fuse resistor such that a resistor and a thermal fuse are laid down on a printed circuit board. In the thermal fuse resistor, through changing a material of the case, the case has a lighter weight and is not easily broken, so that the thermal fuse resistor is advantageously used for an electronic appliance because of its lightness and slimness. The thickness of the case of the thermal fuse resistor serves as the thickness of the electronic appliance employing the thermal fuse resistor, so that the thermal fuse resistor allows the electronic appliance to have a slim structure.

Abstract: A thermal fuse which has its conducting element made of red brass. As such, the conducting element has an identical thermal coefficient as that of a red-brass casing, and the robustness against heat of the conducting element's petals is compatible with that of the casing. In this way, the conducting element will not be stuck with the casing when an overloading current emerges. The thermal fuse therefore is significantly more reliable than a conventional thermal fuse.

Abstract: An overload protection combination structure for a base of a fuse is provided, which is mainly directed to an improved technology of an auxiliary structure for ensuring cutoff of an overload current of the fuse base after the fuse is microminiaturized. The improvement is characterized in that, one or more recesses are formed between two leading pins of a body of the fuse base after being reduced in size, thereby increasing a creeping distance between the two leading pins for holding fuse wires, so that the microminiaturized fuse can comply with requirements of an electronic safety standard.

Abstract: An appliance assembly includes an appliance and an appliance member. The appliance includes a wall defining a plurality of holes. The appliance member is carried by the appliance. The appliance member includes a housing which includes a snap-fit arrangement coupled with the appliance. The snap-fit arrangement includes a first plurality of ears and a second plurality of ears, the first and second plurality of ears snap-fittingly engaging the plurality of holes.

Abstract: An explosion-proof and flameproof ejection type safety surge-absorbing module includes a protective member and a surge-absorbing unit. The protective member comprises a base and an upper lid coupled with the base. The base has two corresponding partitions extending upwards. The surge-absorbing unit includes a body, two connecting leads, and a resilient metallic plate. The body has two sides each defining an electrode surface. The electrode surface is connected with one of the connecting leads. The resilient metallic plate has a first end welded to the electrode surface with a contact member and a second end curved and striding across an outer side of one of the partitions to penetrate through the bottom of the base. In case the body of the surge-absorbing unit is overheated due to high temperature caused by a surge, the contact component will be melted allowing the resilient metallic plate to eject away from the electrode.

Abstract: Disclosed are a thermal fuse resistor having a case injection-molded by using thermosetting resin having heat resistance less than that of filler, a manufacturing method of the thermal fuse resistor, and a method of installing the thermal fuse resistor such that a resistor and a thermal fuse are laid down on a printed circuit board. In the thermal fuse resistor, even if the case has a lighter weight and a thinner thickness by changing the material of the case as compared with those of a case according to the related art, the case is not easily broken, so that the case is suitable for the lightness and slimness of an electronic appliance employing the thermal fuse resistor. Since only the thickness of the case of the thermal fuse resistor is reflected to the thickness of the electronic appliance employing the thermal fuse resistor, the thermal fuse resistor is suitable for the slimness of the electronic appliance.

Abstract: An electronic fuse may receive a silicon/germanium material in the fuse body, which in turn may result in the formation of a metal silicide material of reduced thickness. Consequently, the current density and, thus, the electromigration and heat generation in the metal silicide material may be increased for a given amount of current. Consequently, transistor switches for applying the programming pulse to the electronic fuse may be reduced in size.

Abstract: Metal fuses in semiconductor devices may be formed on the basis of additional mechanisms for obtaining superior electromigration in the fuse bodies. To this end, the compressive stress caused by the current-induced metal diffusion may be restricted or reduced in the fuse body, for instance, by providing a stress buffer region and/or by providing a dedicated metal agglomeration region. The concept may be applied to the metallization system and may also be used in the device level, when fabricating the metal fuse in combination with high-k metal gate electrode structures.

Abstract: A high voltage connector for a battery system includes an upper body having a first portion and a second portion. The first portion of the upper body is located internal to a battery system housing and configured to receive at least one contact from the battery system. The second portion is located external to the battery system housing and is configured to receive at least one contact from a vehicle. The high voltage connector also includes a lower body coupled to the upper body and at least one connecting member provided between the upper body and the lower body. The connecting member is configured to conductively connect the contact of the battery system to the contact of the vehicle.

Abstract: An appliance assembly includes an appliance and a thermal assembly. The thermal assembly includes a housing attached to the appliance, a temperature sensing device carried by the housing and electrically coupled with the appliance, and a thermal fuse carried by the housing and electrically coupled with the appliance, the thermal assembly being a modular assembly and thereby configured for being, as a single unit, attached to and detached from the appliance.

Abstract: A fuse includes a base. The base includes a body and two leads. The body has two side portions each forming a hole extending through top and bottom faces of the body and having a lower end forming a diverging lead-in opening. Each lead has a top end and forms a flattened fixing portion. The lead can be fit into a respective fitting hole of the body through the lead-in opening in an automatic manner with machines and can then be fixed in the fitting hole with the fixing portion. The top end of the lead projects beyond the top face of the fitting hole to serve as a terminal that can then be flattened. In the way, human errors can be eliminated in assembling the lead and the body and the assembling can be done with enhanced precision.

Abstract: An overheating protection device id disclosed for electrically coupling an electrical power source to a fluid propulsion device. The fluid propulsion device includes a propelling member within a manifold for pressurizing a fluid. The propelling member is keyed with a motor. The overheating protection device comprises a housing including a back plate, a top plate, a bottom plate, a first side plate and a second side plate for defining a cavity. The back plate, the top plate, the bottom plate, the first side plate and the second side plate define an aperture. A thermostat switch is positioned within the cavity and is electrically coupled between the electrical power source and the motor. A cover engages the aperture for sealing the thermostat switch within the housing. The cover includes a bore for relieving the thermostat switch. A thermo-conductive layer has an interior surface and an exterior surface.

Abstract: A thermal fuse includes an insulating case having a bottom and having an opening provided therein, a fusible alloy provided in the insulating case, a lead conductor having one end connected to the fusible alloy and other end led out from the insulating case through the opening of the insulating case, a flux provided on the fusible alloy, and a sealer for sealing the opening of the insulating case. The volume of a space between the fusible alloy in the insulating case and the sealer is larger than the volume of the flux. Sealing of the fuse is prevented from deteriorating, and the insulating film is prevented from damage even when the thermal fuse is used for breaking a large current at a high voltage.

Abstract: A thermal fuse includes an insulating case having a bottom and having an opening provided therein, a fusible alloy provided in the insulating case, a lead conductor having one end connected to the fusible alloy and other end led out from the insulating case through the opening of the insulating case, a flux provided on the fusible alloy, and a sealer for sealing the opening of the insulating case. The volume of a space between the fusible alloy in the insulating case and the sealer is larger than the volume of the flux. Sealing of the fuse is prevented from deteriorating, and the insulating film is prevented from damage even when the thermal fuse is used for breaking a large current at a high voltage.

Abstract: In the thermosensor of the invention, both ends 21, 22 of an elastic member 2 are fixed to a body 1 in a state where the elastic member 2 is compressed in a longitudinal direction, to form the elastic member 2 into a convex curved shape, one end side of the convex curved shape is raised by a predetermined angle ?L? with respect to the body 1, a flexure angle of another end 22 of the convex curved shape is zero, the fixation of one end portion 21 of the elastic member 2 and the body 1 is conducted via a fusible material 3, and a melting point or a softening point of the fusible material 3 is an operating temperature.

Abstract: In the thermoprotector of the invention, an elastic movable conductor 3 is placed between stationary electrodes 21, 22 opposed in an insulation housing 1. One end of the elastic movable conductor 3 is fixed to one stationary electrode 21. The elastic movable conductor 3 is compressed in a longitudinal direction and elastically curved to cause a middle of the elastic movable conductor 3 to be contacted with the other stationary electrode 22. Another end portion of the elastic movable conductor 3 is face joined by a fusible material 4 to the one stationary electrode 21 against a reaction force of the longitudinal direction compression. An insulation spacer 5 is disposed in the insulation housing 1. The insulation spacer forms a space for housing the other end portion of the elastic movable conductor 3 when the elastic movable conductor 3 is elastically released by melting of the fusible material 4.

Abstract: There is provided a method for insulating leads of a thermal fuse with an insulating tube that can reduce the quantity of the adhesive and prevent the defect of appearance and the lowering of the value of the product, by applying an adhesive on the circumference of the leads, and putting the insulating tube on the lead from the outer end of the lead while rotating the insulating tube, so that the adhesive is present inside the insulating tube. There is also provided a low-cost, downsized thermal fuse with excellent heat resistance, by using the alloy that has a melting point of 190° C. or above as the fusible alloy, and a copper wire plated with an Sn—Cu alloy for the lead.

Abstract: The invention relates to a thermally controlled electric switching device 1, especially a temperature fuse or a temperature limiter, with a switching contact device 2 comprising a fixed contact 3 and a motion contact 4, as well as a meltable element 8 containing a meltable material 7, wherein the meltable material 7 supports a transmission element 9 before being activated when a trigger temperature is exceeded and, when the trigger temperature is exceeded, is forced out of its receptacle 6 by the end of the transmission element 9 impinging upon it, wherein a radially protruding, flat melt material screen 19 is arranged on the transmission element 9.

Abstract: Quantity of flux coated on fusible alloy of a thermal fuse disclosed can be inspected accurately by an image processing method.

Abstract: A thermal fuse reduced in size and thickness can be obtained. Further, the thermal fuse will not be degraded in characteristics, productivity, reliability, quality, etc. even after reduction in size and thickness. The thermal fuse includes a fuse main body including a substrate, a fusible metal and a cover, and paired terminals disposed protruding from the fuse main body. The other end of the first terminal has a first fusible metal connection, and the other end of the second terminal has a second fusible metal connection. The fusible metal is disposed between the first terminal and the second terminal, and one end of the fusible metal is connected to the first fusible metal connection, and the other end of the fusible metal is connected to the second fusible metal connection. The cover is disposed so as to cover the fusible metal, the first fusible metal connection, and the second fusible metal connection.

Abstract: A manual call point having a housing base (1), a cover and an alarm insert with a fragile panel (4), a printed-circuit board (3), a switching element (6) and an actuating mechanism. The actuating mechanism for the switching element (6) is formed by a pivoting lever (7) resting on a lateral edge of the panel (4), the pivoting lever (7) pressing on the switching element (6) in the normal state of the manual call point and holding the switching element (6) in a closed position. When the panel (4) is smashed the pivoting lever (7) pivots, so the switching element (6) is opened. The switching element (6) is arranged on the printed-circuit board (3) and comprises a flexible end switch. The manual call point also contains a device for triggering a test alarm comprising a switching lever (9) to displace the panel (4) until the pivoting lever (7) is released and comprises a member (10) to actuate the switching lever (9).

Abstract: An electrical functional device for use in the field of aviation, for example, a safety switch, is described. The functional device has a housing out of which a cylindrical fixing neck projects. The fixing neck contains, on an outer circumference thereof, a fine-pitch threading for screwing on a nut, and carries, at a distance from the end thereof that is attached to the housing, a radially protruding bearing flange. The bearing flange serves to hold the device in a fixed position, in which the fixing neck projects through a fastening hole of a wall element and is held therein against the bearing flange by a nut. The fixing neck is a one-piece part made out of plastic. It contains, between the end of the threading thereof and the bearing flange, an unthreaded shaft area, which is coaxial in relation to the fixing neck.

Abstract: An overload-protection push-button switch with retractable mechanism is disclosed. The switch is characterized in that a retractable rocker actuator is used to actuate or release a conducting leaf. The rocker actuator comprises a main body and a sub-body. The sub-body is retractable with respect to the main body under a rotation action or a sliding action. When the bimetallic blade is in an overload position, the sub-body will be pushed and make the rocker actuator became disabled. As a result, the conducting leaf goes into a broken position. By means of the above structure, the trip action of the switch is assured and the space occupied by the rocker actuator is as small as possible under a condition without increasing the complication and loading of the bimetallic blade.

Abstract: An overload-protection push-button switch with automatic resetting mechanism of pull-push type is disclosed. The switch is characterized in that a pull-push rod and a floating rocker are used to transmit a force on a pressing stem to a conducting leaf. Moreover, a guiding mechanism including a guider and a guided-member on the floating rocker is used to guide the moving direction of the floating rocker under the action of the pull-push rod. Thus, the direction force on the pressing stem can be different from the moving direction of the nose of the floating rocker by which the conducting leaf is actuated. Moreover, in case of overload, a positioning unit for positioning the pressing stem will be unlocked and thus the pressing stem can automatically return to its reset position. In view of the above, a push-button switch that has simple and easily-assembled structure as well as an operation of exactly tripping is available.

Abstract: The power circuit breaker has an igniter unit disposed in a cylindrical wall formed in a main housing. A holder is disposed in the cylindrical wall so as to oppose to the igniter unit. The holder has a boss engaged with the cylindrical wall, and a fuse element is held by the holder. Each end of the fuse element is electrically connected to one of a pair of interconnection terminals disposed in the main housing. The holder is locked by a locking lance formed in the main housing when each end of the fuse element has engaged with one of the interconnection terminals. The holder rests on the locking lance when the fuse element has been released from the interconnection terminals after activation of the igniter unit. The fuse element is engaged with and stopped by an insertion hole of the holder.

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 temperature fuse for use in an electric circuit provided in an automobile or the like. The temperature fuse includes a pressure-contact terminal having a pressure-contact blade, a temperature opening and closing member having one end connected electrically to the pressure-contact terminal, a signal wire connecting terminal connected electrically to the other end of the temperature opening and closing member, and an insulating case for receiving therein the pressure-contact terminal and the temperature opening and closing member in such a manner that at least the pressure-contact blade and the signal wire connecting terminal are exposed outwardly from the insulating case.

Abstract: A thermal pellet holds contact-carrying resilient switch blades in bending stress with the contacts closed. Melting of the thermal pellet relieves the bending stress and allows movement of the switch blades to open the contacts.

Abstract: A thermal cutoff having a single switch blade that is held in a contacts-closed position under bending stress by a thermal pellet and that moves to a contacts-open position solely by relief of the bending stress upon melting of the thermal pellet.

Abstract: A fuse includes a tube, a pair of blade terminals projecting from opposite ends of the tube, at least one fuse element disposed in the tube and electrically coupled between the terminals, and a pair of metallic end caps disposed on opposite ends of the tube. Electrically insulative elements are disposed between the end caps and the terminals. The tube is filled with an arc-quenching material inserted through a fill hole that is plugged by a plastic drive rivet. Each terminal is attached to a metallic end plate by means of a staking tang inserted into a slot of the end plate, and by means of a separate solder joint. Each insulative element includes an axial sleeve through which a respective terminal extends for a part of its length. The fuse element having a one-piece metal element bent to form a pair of parallel, superimposed strips divided into sections by means of fusible weak points.

Abstract: A spiral wound fuse includes an elongated housing, a supporting substrate formed of an electrically non-conducting, resiliently deformable, and flexible material, disposed in the housing, a fusible conductor wound around the supporting substrate and end caps mounted to the housing and connected to the conductor at the first and second ends of the supporting substrate. The fusible conductor may be impressed into the resiliently deformable substrate to form ridges of material between adjacent windings of the conductor. The ridges physically separate the windings and help to prevent arcing or bridging when the conductor melts to interrupt the circuit.

Abstract: A thermal cutoff encapsulated in potting material within a dielectric tubular housing having an oval cross-sectional shape and a flat closed end. The thermal cutoff has a cylindrical body located intermediate the open and closed ends of the tubular housing, and the longitudinal axis of the thermal cutoff body is parallel to and laterally offset from the longitudinal axis of the tubular housing.

Abstract: A fusible link wire for use in an electric circuit comprising a fusible conductor for opening the circuit in response to a given current level, an inner electrical insulation layer surrounding the fusible conductor, a braided sheath positioned over the inner electrical insulation layer for increasing the structural strength of the insulation layer and for holding the inner electrical insulation layer in place in the event of a failure, and an outer protective coating surrounding the sheath and the inner electrical insulation layer for holding the sheath in place during handling or processing of the fusible link wire and for providing protection against the environment.

Abstract: A packaging unit consisting of two molded plastic boxes, each having one side open. One of the boxes is laid flat with the open side up and receives therein a thermal cutoff/clip/resistor assembly. The other molded plastic box is placed over the first and the two are held together by symmetrical interlocking devices. The covers serve as assembly fixtures and protective housing.

Abstract: Improved arc-suppressing fuse tubes of the type used in electrical cutouts is provided which includes a fluid epoxy resin matrix core designed, upon experiencing high temperature arcing conditions, to generate sufficient moisture and arc-suppressing gases to safely and efficiently interrupt an arc. The fuse tubes of the invention completely eliminate the use of expensive and difficult to fabricate bone fiber conventionally used in fuse tubes of this type. The preferred fuse tube construction is an integrated, synthetic resin body having an outer tubular shell including an epoxy fiberglass-reinforced synthetic resin matrix, together with an inner tubular arc-suppressing core having an epoxy resin matrix with respective quantities of an organic fiber and an inorganic filler therein. An anhydride curing agent for the epoxy is incorporated at an anhydride to epoxide ratio from about 1.0 to 1.4:1.

Abstract: The Sensor is designed for use in detecting fire, or high temperature in vessels or pipes pressurized with air, gas or liquids. It has a polymer body which confines electrical conductors, and the conductors project from opposite ends of the body. The conductors' projections at one end define terminal blades, and at the opposite end are shrouded with, and electrically connected by, fusible material that has been molded in place. The body has wrenching flats thereabout and tapered pipe threads thereon to allow its installation in the wall of a pressure vessel, pipe, or housing, with the fusible-material end exposed therewithin.

Abstract: A thermal cutoff is mounted adjacent a bleed opening in a hot air duct. Hot air flowing through the bleed opening mixes with ambient air before contacting the thermal cutoff. If a predetermined air temperature is exceeded, the thermal cutoff operates, and de-energizes the air heater.

Abstract: A thermostatically controlled electric flatiron having a heater circuit of sufficient wattage to achieve abnormally high soleplate temperatures on continuous operation is provided with an overtemperature protection assembly for opening the heater circuit before damaging high soleplate temperature occurs on thermostat failure. The assembly includes first and second members connected in the heater circuit and electrically isolated from the soleplate and each other bridged by a third spring-biased circuit member to complete the heater circuit. A slug of eutectic alloy forms a fusible joint bonding the third member intermediate its ends to one of the first and second members to hold the third member against the spring bias in circuit completing contact with the first and second.

Abstract: An improved electrical fuse comprises an oppositely open ended insulating housing in the form of a cylindrical sleeve having a fuse element disposed therein. A pair of cup-shaped end caps close the ends of the sleeve and are electrically and physically connected to the ends of said fuse element. An external lead is connected to each of the end caps and extends outwardly therefrom. A quantity of solder in each end cap is fused to make electrical contact between the end cap and the adjacent end of the fuse element. An adherent insulating coating layer is disposed over the sleeve, end caps and leads to cover, seal, and physically interconnect the exposed exterior surfaces of said sleeve, said pair of end cap means and a portion of each lead adjacent to said pair of end cap means.

Abstract: An electrically heated appliance, such as a steam iron, is provided with an adjustable stacked thermostat assembly having an integrated overtemperature protection control. In the case of a steam iron, the thermostat assembly is mounted on a boss on the soleplate and includes a pair of contacts carried by spring contact blades and adapted to be actuated by a heat deformable bimetallic blade to make and break the circuit to the electric heating element of the iron. The overtemperature protection control includes an electrically conductive rivet electrically connected to one of the electrical power supply terminals of the iron and a U-shaped electrically conductive spring having a first end electrically connected to a conductive member in circuit with one of the spring contact blades and a second end soldered to the rivet by a solder joint fusible at a selected overtemperature to melt and break the circuit between the rivet and the spring.

Abstract: An electronic thermostat is provided with a mounting arrangement between the base means and the cover means that fully protects the electronic components within from both physical and electrical damage during the normal handling of the thermostat. The protection is accomplished by recessing the contact points for the circuitry within openings that can be reached only by mating electrical contacts.

Abstract: An improved electrical fuse having axial leads and comprising a fuse wire in a cylindrical sleeve supported at its ends by lead carrying end caps is coated over the length of the fuse body by an adherent insulating layer (FIG. 4). Improved humidity resistance and mechanical strength are achieved. The necessity for plating the end caps to achieve corrosion resistance is eliminated. Control of coating thickness produces a substantially moderated profile and facilitates application of color coding bands to the coated fuse.

Abstract: An electrical safety connector 10 provides a thermal linkage 12 between two female connectors 11. If a high resistance contact occurs at either connector 11, thermal linkage 12 melts and the molten material, of which thermal linkage 12 was comprised, flows under the influence of gravity to an expansion void 14 in an insulation sheath 13, thus interrupting current flow through connectors 11 and preventing the re-initiation of such current flow. Any potential fire hazard from the localized temperature rise at said high resistance contact is thereby eliminated. An alternate embodiment provides a male pigtail wire 17 for utilizing safety connector 10 in updating the wiring of early wired residences and other structures.

Abstract: An overtemperature protector for an appliance having an electrical heating element includes a fixed contact, a movable contact carried by a spring blade and settable into engagement with the fixed contact to complete the energizing circuit to the heating element by stressing the spring blade, and a torsion spring having an arm engageable with the spring blade to hold the contacts in engagement against the stress bias of the spring blade. A fusible pin retains the arm of the torsion spring in engagement with the spring blade, thus locking the contacts closed. Excessive heat in the appliance causes the pin to soften, thereby allowing the torsion spring to shear the pin and release the movable contact to open the heating element energizing circuit.