Abstract: The invention provides a transformer short-circuit protection method and a transformer short-circuit protection device. The transformer short-circuit protection method includes: acquiring output voltages of a plurality of output lines of at least one winding on a low-voltage side of a transformer; and determining a short circuit according to the output voltages, and sending a protection signal when the short circuit is determined.

Abstract: An overload protection switch with reverse restart switching structure, particularly to one that has a molded-case circuit breaker which adding a lampshade parallel stagnation position for overload indication, and when resetting, needs to press back to the RESET for reconfirmation; due to the stagnation position and reverse restart structure, it can avoid repeating the reset action, preventing the reduction of the life of the overload protection switch and repeated exposure or the misjudgment and then resetting of electrical products that have been overloaded and tripped and then overload again then results in causing dangerous; also, the lampshade can be completely tripped even when the lampshade is suppressed, and prevent the danger of repeated tripping during overload.

Abstract: A low noise relay includes a main body part provided with a terminal on a first surface thereof. A cover part is coupled to the terminal and the first surface of the main body part. The cover part is electrically connected to the terminal of the main body part. A vibration reduction part is connected and electrically coupled to the cover part. The vibration reduction part is configured to support the main body part to be suspended in air. A pin part is configured such that a first side of the pin part is connected with and electrically connected to the vibration reduction part.

Abstract: A monitoring module for a fusible switch disconnect device includes an open fuse detecting element and wire leads for completing an electrical connection with a fuse.

Abstract: A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to displace the switchable contact, as well as multiple other components in the device, in response to a predetermined electrical condition.

Abstract: Fuse state indicators for use with disconnect devices having a fuse are provided. Fuse state indicators include a housing having circuitry, a detecting means for detecting an open circuit condition, conductors adapted for electrical connection to a disconnect device so as to complete a circuit connecting the detecting means with a fuse of the disconnect device, and a signal transmitting means The detecting means is configured to transmit a signal to the signal transmitting means for determining an operational state of the fuse. The signal transmitting means, in turn, is configured to transmit a signal to a remote device the state of the fuse.

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 monitoring module for a fusible switch disconnect device includes an open fuse detecting element and wire leads for completing an electrical connection with a fuse.

Abstract: A safety device for a switch includes a first terminal, a second terminal and a conductive plate connected between the two terminals. A first contact point is connected to an end of the second terminal. The conductive plate has a first end fixed to the first terminal and a second contact point connected to a second end of the conductive plate and corresponding to the first contact point. A push rod is located at a side of the conductive plate and a gap is defined between the distal end of the push rod and the conductive plate. The push rod pushes a mediate portion of the conductive plate when the mediate portion of the conductive plate is overheating to bend toward the push rod under a current overload condition. The push rod applies a force to further separate the first and second contact points so as to ensure the circuit is cut off.

Abstract: A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and switchable contacts for connecting the fuse to circuitry. A tripping mechanism is provided to disconnect the switchable contacts when predetermined circuit conditions occur.

Abstract: Fuse state indicators for use with disconnect devices having a fuse are provided. Fuse state indicators include a housing having circuitry, a detecting means for detecting an open circuit condition, conductors adapted for electrical connection to a disconnect device so as to complete a circuit connecting the detecting means with a fuse of the disconnect device, and a signal transmitting means. The detecting means is configured to transmit a signal to the signal transmitting means for determining an operational state of the fuse. The signal transmitting means, in turn, is configured to transmit a signal to a remote device the state of the fuse.

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: The present invention relates to a thermal protector which is comprised of a bimetal blade, a moving electrical contact, a fixed electrical contact, and a electrical resistor, wherein the bimetal blade has a fixed end and a moving end, wherein the moving electrical contact is positional toward the moving end of the bimetal blade, wherein the moving electrical contact has a minimum volume of 0.0003 in3, wherein electrical resistor generates sufficient heat to keep the bimetal blade above a reset temperature and to maintain the bimetal blade in a bent position wherein the moving electrical contact remains away from the fixed electrical contact during periods of continued application of the electrical current, wherein the reset temperature is above ambient temperature, and wherein the thermal protector is capable of at least 60 cycles of operation at a peak amperage of at least 90 amps at 120 volts of alternating current.

Abstract: An overload protection switch includes a main body and a press button. Several terminals, a conductive plate and other components are arranged in the main body. By means of switching the press button, the switch is switchable between an on state and an off state. In case of overload, the conductive plate will separate from one of the terminals to switch off the switch. The components arranged in the main body will not hinder the conductive plate from separating from the terminal. When switching on the switch, the conductive plate resiliently contacts the terminal. In case of overload, the conductive plate separates from the terminal to switch off the switch so as to provide overload protection effect.

Abstract: A safety switch has a housing, a conducting assembly, a switching assembly and a resilient member. The housing has an on-end and an off-end. The conducting assembly is mounted in the housing and has two conductors and a bimetal strip. The conductors respectively correspond to the on and off-ends and are attached respectively to two separated ends of a circuit. The bimetal strip selectively connects the conductors. The switching assembly has a rocker and a connecting arm. The rocker is mounted pivotally on a top of the housing. The connecting arm connects the rocker and a contacting end of the bimetal strip. The resilient member is mounted between the on-end of the housing and the rocker to stably position the rocker when the circuit is on or off.

Abstract: An over current cut-off switch has an electric insulating housing, a first conductive foot, a second conductive foot, a reed, an electric wire and a switch button. The housing received upper portions of the first and second conductive feet, the reed and the electric wire. The button is configured on a top of the electric insulating housing. One end of the reed uses a connecting conductor to rivet to the first conductive foot. The other free end of the reed is separately connected to a top of the second conductive foot. The electric wire is mounted between the reed and the first conductive foot to be used as current branch. The switch button is configured on a top of the electric insulating housing. One side of a bottom of the switch button has a bump.

Abstract: A switch includes a body with a switch member on a top thereof, an extension extends from an underside of the switch member, and a substantially inverted L-shaped slot is defined through the extension. Two terminals extend through a bottom of the body, in which one of the terminals is fixed with a contact plate. The contact plate has a tongue with a free end, which contacts the other terminal when the circuit is ON, and is separated from the other terminal when the circuit is OFF. An operation member has a first end movably engaged with the slot and a second end connected with the contact plate. A positioning member having a first end pivotally connected to an inside of the body and a second end biasing the first end of the operation member. Under the current overload condition, the switch member is pivoted by a torsion spring to the OFF position.

Abstract: A switch includes a body with a switch member on a top thereof, an extension extends from an underside of the switch member, and a substantially inverted L-shaped slot is defined through the extension. Two terminals extend through a bottom of the body, in which one of the terminals is fixed with a contact plate. The contact plate has a tongue with a free end, which contacts the other terminal when the circuit is ON, and is separated from the other terminal when the circuit is OFF. An operation member has a first end movably engaged with the slot and a second end connected with the contact plate. Under the current overload condition, the contact plate deforms, the first end of the operation member move downward along the vertical space of the slot, and the switch member is pivoted by a torsion spring to the OFF position.

Abstract: A fusible disconnect device having auxiliary connections to line-side and load-side terminals and color coding features to indicate an amperage rating of a fuse.

Abstract: A fuse status indicator module for a fusible switch disconnect device includes a housing, a switch within the housing, a switch actuator extending from the housing and operatively coupled to the switch, at least one open fuse detecting element contained within the housing, and at least one pair of wire leads extending exterior to the housing and attachable to the disconnect device to establish an electrical connection with the fuse therein to facilitate detection of an opening of the fuse.

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: Fusible switch disconnect modules including a housing means adapted to receive at least one fuse therein, switchable contacts for connecting the fuse to circuitry and having at least one stationary contact and at least one movable contact selectively positionable between an open position and a closed position to connect or disconnect an electrical connection through the fuse, and a means for biasing or bias element assisting movement of the movable contact to the open or disconnected position.

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 fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and switchable contacts for connecting the fuse to circuitry. A tripping mechanism is provided to disconnect the switchable contacts when predetermined circuit conditions occur.

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 switchable thermal circuit breaker (10) has an automatically resettable, current carrying thermostatic disc (14) cantilever mounted in a housing (12) and carries a movable contact (14b) into and out of electrical engagement with a stationary contact (14c). A disc coupling member (16) is pivotally mounted above the disc and has fingers (16e, 16f) to capture opposed sides of the disc so that the disc coupling member pivots concomitantly with movement of the disc. A radially extending blade (18c) of a pivot member is biased by a spring (18k) into engagement with a stop surface (16k) of the disc coupling member when the contacts are in the engaged position and is movable under the stop arm (16g) when the disc moves to the contacts disengaged position to prevent reengagement of the contacts.

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: A protective switch for protecting a circuit includes an operating element or rocker switch, contact connections projecting from a housing, a contact spring electrically connected to a first contact connection and having a free end covering a second contact connection for making contact. A bimetallic element in the housing runs transversely to a slider longitudinal direction and is electrically connected between the first contact connection and through the contact spring to the second contact connection. A slider slides in the housing and has a contact end bearing against and acting upon the contact spring counter to its restoring force in a contact position. The slider is latched by the operating element in a turned-on position. The bimetallic element is coupled to the slider for thermal tripping and has a first longitudinal section at least partly covering and unlatching the slider upon overcurrent to break contact, and a second longitudinal section.

Abstract: The invention relates to a re-settable, single-phase, thermo/electric circuit breaker utilizing a U-shape bimetallic element of substantial resistance properties in the circuit, so that when a predetermined overload current occurs the bimetallic element self heats and moves to trip a mechanism that opens the breaker circuit. The invention replaces the double-contact break configuration normally associated with a breaker of this type, with a single contact break configuration designed to produce a sliding action between contacts during the normal reset operation, providing a more reliable continuity at the moveable and stationary contact interface that is also less expensive to produce.

Abstract: A switch includes a switch member and an extension and a push rod respectively extended from two ends of an underside of the switch member. A bi-metallic contact plate has a first end fixed to one of two terminals and a contact portion splits from the contact plate. A first contact point is connected to an underside of the contact portion and a second contact point is connected to the other terminal. A free end of the contact portion is connected with a free first end of a spring member and a second end of the spring member is connected to the contact plate. When overload, the contact portion and the spring member move upward to cut off the circuit while the push rod extends through a through hole defined in the spring member.

Abstract: A switch includes a push rod which extends from an underside of a switch member and the push rod selectively pivots an action member in “ON” and “OFF” positions. A bi-metallic contact plate has a first end fixed to one of two terminals and a contact portion splits from the contact plate. A first contact point is connected to an underside of the contact portion so as to contact a second contact point on the other terminal when in “ON” position. A free end of the contact portion is connected with a free end of a spring member which is fixed on the contact plate. There is a sufficient space for the upward movement of the action member when overloaded.

Abstract: A safety switch includes a switch member and a push rod is pivotably connected to an inside of the switch member. A biasing member pushes the push rod toward a stop rod extending from the inside of the switch member. A bi-metallic contact plate has a first end fixed to one of two terminals and a contact portion splits from the contact plate. A first contact point is connected to an underside of the contact portion and a second contact point is connected to the other terminal. A free end of the contact portion is connected with a free first end of a spring member and a second end of the spring member is connected to the contact plate. When overloaded, the contact portion and the spring member move clockwise to cut off the circuit while the push rod does not stop the clockwise movement of the spring member.

Abstract: A breaker has a first conducting strip and a second conducting strip respectively mounted on a lower end of a shell; a first terminal mounted on the second conducting strip; a bimetal strip securely provided on a first conducting strip; a second terminal mounted on a tip of the bimetal strip and detachably connected to the first terminal; a button provided on an upper end of the shell; a finger pivotally provided under the curved spring; and a lever with a smooth surface provided between the bimetal strip and the finger wherein an end of the lever is bent to form an angle. Hence, the finger can slide on the smooth surface of the lever so that the button can completely return to an original status. Furthermore, when the angle is small, the finger counter clockwise rotates with a small stored power of the bimetal strip.

Abstract: A switch device includes a body with switch pivotably connected to a top thereof and two terminals extend through an underside of the body. A first contact point is connected to one of the terminals and a bi-metallic plate has a first end fixed to the other terminal. A second contact point is connected to an underside of a second end of the bi-metallic plate and located above the first contact point. A pull member has an upper end pivotably connected to the switch member and a lower end of the pull member supports the underside of the second end of the bi-metallic plate. An upper end of a push member is pivotably connected to the switch member and a lower end of the push member is in contact with the bi-metallic plate. A spring is biased between the push member and the body so as to provide a push force to the push member. A board movably received in a recess in an inside of the body and movable by an adjusting member extending through a hole through the body.

Abstract: An improved structure of a circuit breaker is provided which comprises a housing, a rocker-switch, a push-shaft, a pull-shaft, a bimetallic strip, and other parts. There are three terminals under the rocker-switch inside the housing. A bimetallic strip embedded in a groove under the pull-shaft makes contact with that pull-shaft through a silver point at one end. The bimetallic strip also makes contact with the push-shaft at the other end using another silver point. Both the pull-shaft and the push-shaft are connected with a curved spring installed inside the V-shaped slot on an adjustment strip. The bimetallic strip, curved spring, and both the pull-shaft and the push-shaft constitute the main control mechanism that provides the circuit breaking action under overloading condition.

Abstract: A safety switch device includes a case with a switch pivotally engaged with an open top of the case and a ramp defined in an inside of the case. Two terminals are extended from the bottom of the case and a bimetallic plate having a first end fixed to one of the terminals. A distal end of the bimetallic plate is located above the other terminal. A pull rod is pivotally connected to the switch so as to lift the bimetallic plate by a hook portion thereof when switching to “OFF” status. A control member has a first end pivotally connected to the switch member and a probe extended from a second end of the control member. The probe is movably engaged with the ramp and the second end of the control member is movably located above the second end of the bimetallic plate.

Abstract: A switch device includes a case with a switch member pivotally engaged with the open top of the case. Two terminals extend from a bottom of the case and a bimetallic plate has a first end fixed to one of the terminals. A distal end of the bimetallic plate is located above the other terminal. A hooking member has one end connected to the switch member and the other end has a hooking portion with which the distal end of the bimetallic plate is engaged. The distal end of the bimetallic plate is lifted when the switch member is pushed to “ON” position. The hook portion is defined between first and second boards and the second board located lower than the first board is shorter so that the bimetallic plate is allowed to be deformed without obstruction when the switch device is overloaded.

Abstract: A switching device includes a latching mechanism and is cheap to produce and easy to assemble. To this end, the construction is essentially formed from a three-part modular unit including metallic material, and has a spring which supports the back-latching of the latching mechanism, and forces which extend essentially in one plane in the latching mechanism.

Abstract: A circuit breaker includes a base housing comprising a contact cavity therein, first and second terminals at least partially located within said contact cavity, and a thermal trigger element fixedly coupled to said first terminal and in electrical contact with said second terminal in normal operation is provided. The thermal element is configured to activate and break electrical contact with said second terminal upon a predetermined current condition.

Abstract: A pushbutton resettable circuit breaker is shown having features to prevent manual opening by simply pulling outwardly on the pushbutton. In one embodiment, the pushbutton (16) is formed with slots (16b) which are configured to provide a reaction surface essentially inaccessible without a special purpose contact opening tool (30). The tool is provided with portions that are insertable into the slots and into engagement with the reaction surfaces for pulling the pushbutton out and manually opening the contacts. In a second embodiment, a small aperture 16k is formed through the rating tab and top and wall of the button and in alignment with a movable plunger (28). A special purpose contact opening tool (32, 34) can be inserted through the aperture to apply a force to the plunger and mechanically trip the circuit breaker.

Abstract: A circuit breaker includes a nonconductive housing, a first breaker contact within said housing, and a trigger element having a second breaker contact located within said housing. The trigger element is thermally activated to separate the first and second breaker contacts in an overcurrent condition. A nonconductive reset mechanism is located in the housing and configured for sliding actuation to prevent electrical connection between the first breaker contact and the second breaker contact after the trigger element has activated.

Abstract: A circuit breaker (10) has a current carrying bimetallic element (18) which bends upon self-heating and upon being subjected to a selected overload current transfers motion to a connecting plate (32) which displaces a latch surface (42b) from a catch (34a) of a bell crank mechanism (34) allowing a spring biased operating member (28) to move movable contact means (12) out of contact engagement with stationary contact means (14) thereby tripping the circuit breaker. An arc sensing circuit (52) is coupled to the load circuit and upon sensing selected arcs causes an arc responsive actuator (56, 62) to be energized to transfer motion to the latch (42) to trip the circuit breaker.

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 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 an open top and a closed bottom, with a button pivotally connected to the housing at the open top, and with a grounding prong, an output blade and an input blade extending out of the housing through the closed bottom. The output blade has an inner end provided with a first contact. The input blade has an inner end formed with a bimetal strip that is provided with a second contact normally engaged with the first contact. The button is further formed with a leg extending towards the strip, and a hook is pivotally connected to the leg and has an arm beneath the strip. A neon indicator has first and second terminals. The second terminal is electrically connected to the output blade, and a resistor is electrically connected between the grounding prong and the first terminal of the neon indicator.

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 bimetal plate is connected. A second contact point is connected to a tongue of the bimetal plate. A switch member is connected to the casing and a connection member is connected to an end of the switch member. An end of the connection member has a recess and an end of the bimetal plate is movably located in the recess.

Abstract: The present invention relates to an overload protection device of a press type switch in which the switch main body has slide grooves within the bouncing range of the free end of the conductive strip. The shape of the slide grooves is formed by a plurality of slide rails. A push-pull element is pivotably connected to the inside of the press button. A cross bar is fitted to the bottom of the push-pull element while both ends of the cross bar are disposed in the slide grooves. Accordingly, the push-pull element is able to change path and locating position in the slide grooves. Moreover, the conductive strip can be controlled in on/off-state by means of the force in different directions. Beside, the free end of the conductive strip is kept in an independent state so that the conductive strip is transformed into the off-state in case of overload. Consequently, the safety of the user can be ensured.

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 end terminal of the right terminal is connected upward to a bimetallic 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 bimetallic engaging plate with the engaging block to form a closed circuit, and if the current is overload or a short circuit is formed a

Abstract: The present invention relates to a safety switch for protecting circuit having a change-over push-pull rod between a button shade and a conductive strip. The top end of the push-pull rod is pivotally connected to the button shade while the bottom end thereof includes a pushing part and a pulling part which are not the same length. The push-pull rod and the external end of the conductive strip are not coupled, but situated in a pushing and pulling change-over relationship. In cooperation with the inner and outer spring elements and a play groove, the conductive strip will be collapsed in a manner of reverse deformation for a disconnection when the current is overloaded, without restricted by the pushing part and the pulling part. Besides, the safety switch includes the ON-OFF change-over function under ordinary state. The configuration is therefore simplified and the user safety is much more ensured.

Abstract: A switch device has a conventional fuseless breaker device, a first conductive blade, a second conductive blade, a fixed plate, and a movable plate. The breaker device has a metal bar having two expansion coefficients, an insulator plate, a safety button, and a coiled spring. The metal bar contacts the first conductive blade. A pressing button which is disposed on the switch device has a first portion and a second portion. A lamp assembly is disposed in the pressing button. The lamp assembly has a break display lamp and a dark display lamp. The break display lamp is disposed in the first portion of the pressing button. The dark display lamp is disposed in the second portion of the pressing button.