Abstract: An electric circuit connected to a thermal switch with three terminals and a method for connecting the switch are realized. In an electric circuit of a common power supply, an external connection wire (first terminal) of a thermal switch arranged close to a current limiting resistor is connected to a load side (rectifier circuit), the current limiting resistor is connected between the external connection wire (first terminal) and an external connection wire (second terminal), and an external connection wire (third terminal) is connected to the output side of a power supply switch. Thus, the current limiting resistor is connected and arranged to an internal resistor unit of the thermal switch in series and to a switch unit (contact) in parallel.

Abstract: The present invention relates to an external operation thermal protector incorporating two thermal plates, each having a first resistance element module having a first polymer PTC element and a second resistance element module having a second polymer PTC element fixed to a body casing together with the fixed end of a movable plate interlocked with a bimetal and a second terminal. Two gaps for absorbing the volume expansion caused when each polymer PTC element generates heat are provided between the plates and the inner walls of the body casing. The current for an external load between a first terminal and the second terminal is interrupted by externally energizing the second terminal and a second connection unit, the current interruption is self-sustained.

Abstract: A self-hold type thermal protector according to the present invention includes a movable contact of a movable plate rises and separates from a fixed contact when a bimetal of the thermal protector inversely warps at a predetermined temperature, an electric current between the contacts, namely, an electric current between a movable contact side terminal and a fixed contact side terminal is disrupted, and the disrupted current flows into the polymer PTC element, which is then made to produce heat and is thermally expanded to increase a resistance value. A second terminal member on a side opposite to a first terminal member where the polymer PTC element is positioned and fixed forms a bowing part, and a gap h is formed between an upper inner wall of a housing and the upper surface of the second terminal member.

Abstract: In a temperature switch according to the present invention, a base member made of an insulative resin and a switch configuration are integrated into one body with insert molding, and accommodated within a housing. A terminal fixing part of the base member blocks an opening of the housing vertically to an interior surface of the housing, and a sealing member seals the opening of the housing from an exterior surface of the housing. A first external connection terminal (a second external connection terminal is similar) prevents externally pulling and pressing forces applied to the terminal from applying to an internal configuration in a state where a portion formed by being bent into two stages composed of a horizontal part continuous with a tip, a vertical part, and a horizontal part is buried in the terminal fixing part.

Abstract: A motor protector of the present invention includes: a serial current path that is formed between a first terminal and a second terminal and that sequentially connects a fixed contact, the first terminal, a movable contact, a movable plate holding a bimetallic element, an intermediate fixing plate, a first electrode section, a first resistor, a second electrode section, and the second terminal, the fixed contact being held by a base member stored in an insulating resin case that includes an opening sealed by the sealing member; and a parallel current path that is formed between the first terminal and the intermediate fixing plate and that sequentially connects the first terminal, a conductive bottom plate, a second resistor (PTC) 19, and the intermediate fixing plate, wherein, after the first resistor produces heat due to an excessive current and the bimetallic element is thus thermally activated, thereby opening a contact, a current-interrupted state is also maintained because the high resistance of the PTC

Abstract: Embodiments relate to an external operation thermal protector incorporating a polymer PTC element that is operable in a safe state in which a hot spot does not occur even under volume expansion due to thermal expansion at the time of heat generation. A terminal plate of a resistance element module having a polymer PTC element is caulked above a column and fixed to a body casing together with the fixed end of a movable plate interlocked with a bimetal and a second terminal. Another terminal plate of the resistance element module is arranged with a gap, for absorbing the volume expansion caused when the polymer PTC element generates heat, with respect to the inner wall of the body casing. The current for an external load between a first terminal and the second terminal is interrupted by externally energizing the second terminal and a third terminal.

Abstract: A self-holding type thermal protector, wherein a movable contact of a movable plate rises and separates from a fixed contact when a bimetal of the thermal protector inversely warps at a predetermined temperature, an electric current between the contacts, namely, an electric current between a movable contact side terminal and a fixed contact side terminal is disrupted, and the disrupted current flows into the polymer PTC, which is then made to produce heat and is thermally expanded to increase a resistance value. A second terminal member on a side opposite to a first terminal member where the polymer PTC is positioned and fixed forms a bowing part, and a gap is formed between an upper inner wall of a housing and the second terminal member.

Abstract: A movable contact of a movable plate rises and separates from a fixed contact when a bimetal of the thermal protector inversely warps at a predetermined temperature, an electric current between the contacts, namely, an electric current between a movable contact side terminal and a fixed contact side terminal is disrupted, and the disrupted current flows into the polymer PTC, which is then made to produce heat and is thermally expanded to increase a resistance value. A second terminal member on a side opposite to a first terminal member where the polymer PTC is positioned and fixed forms a bowing part, and a gap h is formed between an upper inner wall of a housing and the second terminal member.

Abstract: A first terminal of a protection element of a control unit is connected to a wire between a motor and a switching element, and a second terminal is directly connected to a ground-side wire shared by a controller and the switching element. The protection element has a normal-condition-OFF-type switch including a movable contact and a fixed contact. When an overheating caused by the switching element attains a predetermined temperature or higher, the movable contact and the fixed contact are closed to short-circuit the first terminal and the second terminal, and an electric current is branched to the protection element side to reduce an electric current flowing into the switching element, and the control unit is shifted to a temperature range safe from the overheating caused by the switching element without stopping a cooling system.

Abstract: Terminal plates 4 and 33 of respectively a first resistance element module having a first polymer PTC 2 and a second resistance element module having a second polymer PTC 32 are caulked above and below a column 37 and fixed to a body casing 13 together with the fixed end of a movable plate 15 interlocked with a bimetal 14 and a second terminal 17. The other terminal plates 5 and 34 respectively of the first and second resistance element modules are arranged with a gap for absorbing the volume expansion caused when each polymer PTC generates heat with respect to the inner wall of the body casing 13. The current for an external load between a first terminal 34-2 and the second terminal 17 is interrupted by externally energizing the second terminal 17 and a second connection unit 5-1, the current interruption is self-sustained.

Abstract: An electric circuit connected to a thermal switch with three terminals and a method for connecting the switch are realized. In an electric circuit 40 of a common power supply, an external connection wire 27 (first terminal 8) of a thermal switch 10 arranged close to a current limiting resistor 39 is connected to a load side (rectifier circuit 35), the current limiting resistor 39 is connected between the external connection wire 27 (first terminal 8) and an external connection wire 28 (second terminal 21), and an external connection wire 29 (third terminal 22) is connected to the output side of a power supply switch 32. Thus, the current limiting resistor 39 is connected and arranged to an internal resistor unit 18 of the thermal switch 10 in series and to a switch unit 38 (contact) in parallel.

Abstract: Various embodiments include a thermal protector, including the rear end of a movable plate fixed to one end of a resin base and a pair of terminals for connection with an external circuit fixed to the other end thereof. Fixed contacts are formed on the fixed portions of the terminals, and the movable contact of the movable plate is disposed opposed to the fixed contacts. A bimetal element engaged with the center of the movable plate is set to project upward at normal temperature, thus bringing the movable contact into pressure contact with the fixed contacts with prescribed contact pressure. The bimetal element consists of an inversion area wherein the inversion area has no portion overlapping the conduction path area of load current.

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 16 of a movable plate 4 is partitioned into a narrow-width part 17 and a wide-width part 18 by a slim hole 19. The movable plate 4 is assembled to a fixed conductor 2 with columns 9 of an insulator 3, a bimetal 5 is assembled to the movable plate 4, the entire configuration is pressed down by a resinous block 6, and the entire fixing part is fixed by melting tips of the columns 9. The wide-width part 18 serves as a normal movable plate, whereas the narrow-width part 17 serves as a conductor in a normal state and as a resistor against an overcurrent.

Abstract: A movable plate 8 is partitioned by a slim hole 23 into a narrow-width part 21 and a wide-width part 22. When a contact is closed as a thermal switch 10, the narrow-width part 21 produces heat with an applied current branched via a first terminal 3 and a second terminal 4, which short-circuits both ends of the current limit resistor, and the heat of a bimetal 9 is retained with a small amount of local heat to self-hold the non-restoration state, so that the current limit resistor is quickly cooled down. When the power supply switch is turned off, the heat produced by the narrow-width part 21 is quickly cooled down to restore the thermal switch 10 in a short time. Also when the power supply is again turned on in a short time, the current limit resistor is made to function efficiently.

Abstract: Terminal plates 4 and 33 of respectively a first resistance element module having a first polymer PTC 2 and a second resistance element module having a second polymer PTC 32 are caulked above and below a column 37 and fixed to a body casing 13 together with the fixed end of a movable plate 15 interlocked with a bimetal 14 and a second terminal 17. The other terminal plates 5 and 34 respectively of the first and second resistance element modules are arranged with a gap for absorbing the volume expansion caused when each polymer PTC generates heat with respect to the inner wall of the body casing 13. The current for an external load between a first terminal 34-2 and the second terminal 17 is interrupted by externally energizing the second terminal 17 and a second connection unit 5-1, the current interruption is self-sustained.

Abstract: A movable contact of a movable plate rises and separates from a fixed contact when a bimetal of the thermal protector inversely warps at a predetermined temperature, an electric current between the contacts, namely, an electric current between a movable contact side terminal and a fixed contact side terminal is disrupted, and the disrupted current flows into the polymer PTC, which is then made to produce heat and is thermally expanded to increase a resistance value. A second terminal member on a side opposite to a first terminal member where the polymer PTC is positioned and fixed forms a bowing part, and a gap is formed between an upper inner wall of a housing and the second terminal member.

Abstract: The electro-magnetic relay comprises a contact block which is structured to uniformly maintain the contact resistance between the terminals of two circuits. Fixed contacts are provided for each of the terminals of the two circuits and each of two sets of a pair of movable contacts in positions corresponding to these is supported by two both-end-supported movable springs. An insulation sheet and a press spring are overlapped over the two movable springs and disposed as a bridge. A pair of tongues are formed on the press spring by a Z-character shaped cut and by an armature pressing their tips, the insulation sheet and press spring transforms to an upward concave shape, the two movable springs bend and are taken in inside while inclining and the movable contacts touch the fixed contacts while sliding.

Abstract: In a temperature switch, a cut-out portion of the substrate is formed of a first cut-out portion and a second cut-out portion which are made from the side part toward the center. At a fixation part of a movable plate in the temperature switch, a pawl part and an elastic locking part having an L-shaped cross section are formed adjacent to the pawl part on the upstream side in the sliding direction. When the pawl part is fitted in the second cut-out portion, a tip of the elastic locking part abuts an end portion-top surface of the substrate and the elastic locking part reversibly warps upwardly.

Abstract: A thermostat has a movable place where a spring point and a securing plate portion are integrally formed. The spring point is provided with a movable contact at a position that faces a fixed contact, a protrusion with which a bimetal that counter turns comes into contact, a hole for inserting the head of a bimetal holding point, and a protrusion for holding the bimetal, and the spring point is valley-folded at a folding point so as to face the securing plate portion. The securing plate portion is integrally constituted of a terminal point connected to one external terminal, a fixation point for securing an insulating plate, which has the fixed contact in a manner to hold the plate from both sides, and a holding point folded and set up, penetrating a central hole of the bimetal to hold the bimetal.

Abstract: The rear end of a movable plate is fixed to one end of a resin base and a pair of terminals for connection with an external circuit is fixed to the other end thereof. Fixed contacts are formed on the fixed portions of the terminals, and the movable contact of the movable plate is disposed opposed to the fixed contacts. A bimetal element engaged with the center of the movable plate is set to project upward at normal temperature, thus bringing the movable contact into pressure contact with the fixed contacts with prescribed contact pressure. The bimetal element consists of an inversion area which has no portion overlapping the conduction path area of load current, in a disposition space inside a housing, of the thermal protector, it is not affected by Joule's heat from the conduction path.