389results about "Adjustment of protective switch conditions" patented technology

A circuit breaker having a safe construction, where no electrically charged portions are exposed in an accessory installation area or anywhere outside a main circuit case even if a cover of the circuit breaker is opened in a live condition. In order to achieve above object, the circuit breaker of this invention includes the main circuit case made of an insulating material, and an opening-closing trip mechanism disposed outside of the main circuit case and electrically insulated from the main circuit. According to this invention, a circuit breaker capable of eliminating the risk of an electric shock, thereby providing the excellent safety can be obtained.

An arc fault and/or ground fault circuit interrupter includes an operating mechanism structured to open and close separable contacts, a trip mechanism cooperating with the operating mechanism to trip open the separable contacts, a test button structured to test the operating mechanism, an indicator, and a controller structured to configure a setting of the circuit interrupter and operate the indicator to indicate the setting in response to an actuation of the test button.

Maintenance trip functions override the normal or specified trip functions of a low voltage circuit breaker to reduce pickup currents and/or time delays to effect faster trips, which reduces arc energy produced by faults during maintenance or testing on a live circuit breaker.

A diagnosis apparatus for a switchgear comprises a sensing unit which detects a partial discharge signal of the switchgear, an amplifying unit which amplifies the partial discharge signal detected from the sensing unit, a frequency spectrum generation unit which converts the amplified partial discharge signal into a frequency spectrum; and an analysis-diagnosis unit which analyzes and diagnoses the frequency spectrum.

A thermal overload relay includes an inversion operation mechanism that is driven by a releasing lever to open or close a contact. The inversion operation mechanism includes a movable plate supported at one end so as to be inverted, and a tension spring for driving the movable plate for inversion. The releasing lever presses a middle of a wire of the tension spring to drive the movable plate for inversion. A projection is formed in the middle of the wire of the tension spring to contact with the releasing lever. Thus, a stable inversion operation can be made regardless of the positioning of an adjustment dial.

An apparatus and method for controlling the operation of a solenoid in a circuit breaker includes a control circuit configured to receive an activation signal in response to a predetermined condition. The control circuit, in response to said activation signal, provides a first energizing signal to the solenoid for a first predetermined period, and cuts off the first energizing signal for a second predetermined period. The control circuit further provides a second energizing signal to the solenoid for a third predetermined period.

An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and accesses a program of a plurality of programs external to the module plug based on the program identifier. The microprocessor responds to the program to perform a function identified by the module plug. The function identifiable by the module plug includes a communications function, a load monitoring function, a non-tripping ground fault alarm function, a flag function, or any combination thereof.

Contactor-circuit breaker comprising a control electromagnet and a protection device both capable of acting on mobile contacts in response respectively to a deliberate control and to a detected electrical fault, through a multi-pole device. An electromagnetic tripping device (41) is added onto a contact control mechanism (40). The protection device (30), preferably interchangeable, is connected to the electromagnet (20) through a control line (33B) and to the control mechanism (40) through a trip line (33A) so that it outputs an electrical power supply to the electromagnet on the control line, and in the case of a fault, a trip signal on the trip line. The electromagnet (20) is of the DC type, and the protection device (30) adapts its power supply voltage.

A user adjustment assembly for translating user-adjustable dial settings to tripping levels of an electronic trip unit includes a potentiometer and an adjustment button. The potentiometer is positioned inside a cover of the trip unit and includes a potentiometer button. The adjustment button is coupled to the potentiometer for mechanically adjusting it and includes an insulation disc for increasing resistance to electrostatic discharge, preventing contaminants from entering the printed wire assembly components, and preventing application of downward force to the potentiometer button. The insulation disc has a bottom surface that is dimensioned to be larger than the potentiometer button. The adjustment button includes one or more stops that trigger a fail safe operation mode where the tripping levels are automatically adjusted to higher or predetermined protective levels when the adjustment button is moved to those stop positions. Switch calibration is obviated and the simplified design reduces overall cost.

A switchgear installation has a cubicle with a door to provide access thereinto, and a low voltage air circuit breaker is mounted therein and accessible through the door. Coupled to the circuit breaker is a logic module, and a portable user interface module is releasably mounted on the exterior of the door and operatively connected to the logic module to display information concerning the operation of the breaker and to provide an interface for the user to interact with the logic module and thereby with the breaker.

The circuit breaker current/time characteristic value at which the bimetal in a thermal trip assembly actuates a trip mechanism is adjusted by an adjustable coupler that includes first and second pivoted members separately rotatable about a common pivot axis. Deflection of the bimetal by an overload current causes rotation of the first pivoted member, which is coupled by a coupling member extending parallel to the common axis into the second pivoted member which rotates to actuate the trip mechanism. A positioner moves the coupling member toward and away from the common pivot axis to adjust the amount of deflection of the bimetal needed to actuate the trip mechanism.

The invention belongs to the technical field of high/low voltage electrical apparatuses. A load variation tracking automatic rated value breaker mainly comprises a movable/fixed contact component 1, an electric tripping mechanism 2, an electric reclosing mechanism 3, an electronic control system 4, current sensors L1, L2 and L3, an electrical leakage sensor L4 and a grounding sensor L5, wherein a signal acquisition and processing system which consists of a load voltage detection circuit, a load current detection circuit and a load current phase detection circuit is used as a main information source; variation in acquired load voltage and load current is used as a main basis for judging and differentiating a working state and a fault state of the breaker; meanwhile, the phase of the acquired load current and a calculated power factor are also used as main bases for judging and differentiating the working state and the fault state of the breaker; and a tripping protection program and a rated value updating and setting program are accessed according to judgment results; thus, a high-flexibility and high-precision protection characteristic is achieved, and accidents and fire disasters are avoided.

The invention relates to a closing and opening spring connecting mechanism. The closing and opening spring connecting mechanism comprises a spring barrel and a compression spring; one end of the compression spring is fixed in the spring barrel, the other end of the compression spring is a free end, a tray is installed on the end face of the free end in an abutting-against mode, a groove wheel is installed in the spring barrel, a chain is arranged in a wheel groove of the groove wheel in a winding mode, the end, extending out of the spring barrel, of the chain is connected to an energy storage connecting lever or an outputting connecting lever, the other end of the chain extends in the compression direction of the compression spring and is connected with a screw through a chain connector, and the other end of the screw penetrates through the tray and is connected with the tray through a screwing nut. Lateral force between an existing tray and an existing spring barrel is avoided; in the motion process, the frictional resistance is small, and the transmission efficiency is high. By means of an adjusting tool, spring pre-compression amount adjusting becomes convenient and rapid, the spring pre-compression amount can be adjusted without taking down the tray and the compression spring, and the work efficiency is improved.

A simple mimic-disconnecting switch circuit comprises commutating bridge, direct current replay, LBD, diode and resistance, the four direct current replays set in mimic-disconnecting switch circuit constructs logic action circuit of the mimic-disconnecting switch, it includes a HQ in mimic-disconnecting switch switching loop, a HCJ in simulating switching control loop, a TQ in mimic-disconnecting switch tripping loop, a TCJ in simulating tripping control loop. The circuit of the invention is simple, test property is stable, the cost is low, and the capacity is small, the weight is light, it suits for engineering maintain personnel to take, and it is a assistant tool for debugging locale.

The present invention relates to an electric protective switch device having control electronics, particularly a motor starter for an electric motor, contactor or the like, wherein the control electronics can be linked to a bus system 146 via a communication module 140 and the communication module 140 can be plugged and can be electrically contacted to a control module 120 by contacts 147. According to the invention, the first mechanical guide elements 106 at the switch device base module and the associated mechanical elements 144 at the communication module 140 are designed such that electric contact between the communication module 140 and control module 120 only occurs if in the order of plugging, first the communication module 140 is mechanically connected to the switch device base module 100, and then the control module 120 is plugged onto the switch device base module 100 and communication module 140. The pluggable communication module 140 is designed as an interface between the control electronics and an electronic bus system 146.

The present invention relates to an intelligent type control and control device of protection switch electric equipment. It includes the following several portions: main body module, current detection module, power supply module and HMI module. It is characterized by that it also includes main program software. The described main body module includes voltage signal input module, current sensor, zero sequence current sensor, optical isolation digital quantity input module, signal conditioning circuit, central microprocessor, output module, temperature protection module, 4-20 mA analog output module and Modbus communication interface. Said invention also provides its working principle and concrete operation method.

An interface assembly is for an electrical switching apparatus. The electrical switching apparatus includes a housing, a first handle partially extending through the housing, separable contacts located within the housing, an operating mechanism to open and close the separable contacts, a main printed circuit board located within the housing, and a number of electrical rating settings associated with the main printed circuit board. Each of the electrical rating settings has a magnitude. The interface assembly includes: a base assembly comprising a base, the base being disposed on the housing, the base having a mounting surface; and a second handle coupled to the mounting surface, the second handle and the first handle being structured to drive each other. The mounting surface has at least one port. The magnitude of a corresponding one of the electrical rating settings is visible through the at least one port.