90results about "Electrothermally operated protective switches" patented technology

The invention relates to a single phase ac motor over current protector in the field of compression refrigerating machine motor protector. It comprises a casing, a cover, an electric-heat wire, a double mental sheet, a fist hook, a second hook, a moving contact, a static contact, a fixed base and a trigger mechanism, wherein the static contact is fixed on the first hook; the electric-heat wire is fixed positioned inside the electric-heat wire channel by a pair of first and second column; the second column is connected with the second hook; the double mental sheet is disk type and positioned on the double mental sheet base upper to the electric-heat wire; the trigger mechanism comprises a top rod and a spring sheet; the top rod is positioned in the top rod hole of the fixed base; the top end and the low end of the double mental sheet are corresponding with the spring sheet; the fixed end of the spring sheet is fixed on spring sheet fixed base which is the lower part of the fixed base; the free end extents to the contact space-limit which is the channel lower part of the fixed base; the moving contact is fixed on the free end and is corresponding with the static contact.

An starter and protector for an energy-saving integral single-phase alternating current motor, belonging to cold compressor motor protecting equipment technology field, includes a housing, a cover, a motor protector mounted in the housing, a motor starter mounted on the housing, and a plug-in sheet mechanism composed of a L plug-in sheet, a N plug-in sheet and an earthing plug-in sheet. The motor starter includes a first pin, a second pin and a positive temperature coefficient thermistor, and is characterized in that the two ends of the positive temperature coefficient thermistor are equipped with a supporting wall separately, wherein the pair of the supporting walls being parallel with each other, a rostellum being arranged on the basic centered position of the upper side of each supporting wall, the two bottom sides of the positive temperature coefficient thermistor contacting the rostellum, and the two sides of the positive temperature coefficient thermistor holding with the first and the second pins separately. The invention has well energy-saving effect, and has substantial deflated volume, which being help to save the material for manufacturing the positive temperature coefficient thermistor.

A fast acting switching mechanism for a circuit breaker includes a drive rod articulated to a drive module and supporting at an end thereof a contact bridge having at opposite ends thereof respective moveable contacts for switchably engaging a pair of fixed contacts of the circuit breaker. A contact spring unit is operatively coupled to the drive module for applying closing pressure in the order of 200 Kg; and a latch latches the drive rod in an open or closed position after operation of the circuit breaker and prevents rebounds. The contact bridge includes a pair of side conductors supporting on upper edges thereof an armature having an exposed upper surface that supports the moveable contacts at opposite ends of the armature; and a reinforcing element inserted between the side conductors.

A protector (1) has a metal header (30) that mounts a first terminal (31) and a second terminal (32) electrically isolated from one another. A metallic housing (10) is fixed to the header (30) and forms a chamber. A stationary contact (40) is electrically connected to the first terminal (31), a heater (50) is electrically connected between the second terminal (32) and the header (30), and an arm assembly (60) is arranged inside the chamber, with an end thereof being fixed to the housing. The arm assembly (60) includes an electrically conductive movable plate (70) having a movable contact (77) engageable with the stationary contact (40), a thermally responsive member (80) arranged at a position where it lies over or under the movable plate (70) and an electrically conductive weld slug (90) that fixes the movable plate (70) and the thermally responsive member (80) to the housing (10).

An adjusting device is for a thermal trip of a switchgear. It includes a bimetal, which is held in a fixed manner on a bimetal support, whose free end is located at a distance from a tripping lever, and which increasingly acts upon this tripping lever in a tripping direction as a result of thermal deformation. A distance can be adjusted by deforming the bimetal support. The adjusting device is particularly suited for use in circuit-breakers or the like.

A fast engage, slow release electrical actuator combines an electromagnetic actuator with a thermal actuator, the latter which retains the electromagnetic actuator after the former has been actuated to delay the release thereof.

The invention provides a plug, comprising a shell body (1), terminals (2, 3, 4) extending into the shell body, and electric output wires (5, 6, 7). The invention has the characteristics that the shell body is also provided with a temperature and electric current protector (100), wherein the temperature and electric current protector (100) comprises a bimetallic strip (40) and a thermal resistor (50) which is arranged in parallel at the two ends of the bimetallic strip (40); the temperature and electric current protector is arranged in series between the live wire terminal and the live wire of the electric output wire. The invention is capable of preventing the automatic resetting of the bimetallic strip after breaking off to shut off the circuit, which enhances the safety of the use, as the electric supply of the plug needs to be cut off and the power supply needs to be connected to reset the power source after the temperature falls. Therefore, the safety is enhanced; and the plug is more sensitive to the protection of overcurrent.

A mechanized vent for a dishwasher employs a vent plate moving about a hinge axis as driven by a cam mechanism at a surface of the vent plate removed from the hinge axis.

A thermal protector (1) including two fixed contacts (13A, 13B) provided at the end part of conduction terminal pins (5A, 5B) projecting into a metallic enclosed container (100), a support (6) arranged in a case, an oscillatory heating resistor (8) supported by the support and having two movable contacts (9A, 9B) facing the fixed contacts, and a heat responsive body (10) interposed between the heating resistor and the support and coupled with the heating resistor through a coupler (12). When an overcurrent flows through the heating resistor to generate heat therefrom and the temperature of the heat responsive body reaches a set level, the heat responsive body is inverted. Inverting motion of the heat responsive body is transmitted to the heating resistor through the coupler, and the current path is opened.

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

A trip device support frame for a circuit breaker is provided. The trip device support frame includes a calibration tab that is a cantilever member. As a cantilever member, the calibration tab may be moved, i.e. deformed at a proximal end of the tab, so as to adjust the position of the calibration tab relative to the other portions of the trip device support frame. The calibration tab extends upwardly and the distal end thereof is disposed adjacent a top member of a circuit breaker housing assembly. The circuit breaker housing assembly, and more specifically a housing assembly top member, includes a calibration slot. In this configuration, the calibration tab distal end may be engaged by a calibration tool from the upper side of the circuit breaker rather than a lateral side.

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

A heater assembly is provided for an electrical switching apparatus. The heater assembly includes a heater element and an elongated bimetal. The heater element includes first and second ends, an intermediate portion disposed therebetween and an aperture disposed proximate the first end. The elongated bimetal includes opposing first and second ends, and is movable between first and second positions corresponding respectively to the separable contacts of the electrical switching apparatus being closeable, and to the first end of the elongated bimetal cooperating with a trip bar to cause an operating mechanism to open the separable contacts. The second end of the elongated bimetal is coupled to the intermediate portion of the heater element. When the elongated bimetal is disposed in the first position, the first end of the elongated bimetal extends beyond the upper surface of the first end of the heater element into the aperture of the heater element.

A system (120) for preheating a bimetal protector (126) of a single phase motor (122) equipped with a first run capacitor (CR) and optionally a second run capacitor (CR-H). A first and optionally a second pair of normally closed fixed contacts (132;133) are operable by a bimetal element or disc (128).. There may be provided an optional first preheating element (134). A second preheating element (135) is supplied via the first or second run capacitor. The second pair of contacts (133) may connect the second heating element (135) to the first or second run capacitor (CR;CR-H). The first pair of fixed contacts are operable, so that the second heating element is supplied when the first pair of fixed contacts is open, i.e. at the occurrence of a locked rotor fault of the motor. A single bimetal disc may serve to open the first pair of fixed contacts (132) and to close the second pair of fixed contacts (133). The protector automatically resets after a controllable time delay following activation.The invention concerns a starter for a line start electric motor having at least one main winding ( 4 ) and at least one start winding ( 12 ) and which start winding is connected in series with a run capacitor ( 14 ) with which a start capacitor ( 17 ) and a PTC-thermistor ( 19 ) are connected in parallel. In order to make a simply constructed starter for a line start electric motor the start capacitor ( 17 ) and the PTC-thermistor ( 19 ) are connected in series with a switch mechanism ( 20 ). The series connected circuit made up of the start capacitor ( 17 ), the PTC-thermistor ( 19 ) and the switch mechanism ( 20 ) is connected in parallel with the run capacitor ( 14 ).