摘要:
Provided is an electromagnetic relay which can sufficiently dissipate heat generated from a coil to secure desired attracting force even when the electromagnetic relay is miniaturized. The electromagnetic relay includes an electromagnet block and a contact switching mechanism. A movable contact piece of the contact switching mechanism includes a contact attaching portion to which a movable contact is attached, and a first fixed portion attached to a first movable iron piece of the electromagnet block. The first fixed portion is in surface contact with the movable iron piece and is substantially equal in width dimension to the movable iron piece.
摘要:
An overcurrent switching device for an electric circuit to be monitored, which has interrupter contact means (14) constructed in such a manner that an interruption of the electric circuit is effected as a reaction to the exceeding of a predetermined current threshold, wherein the interrupter contact means have an expansion unit (16) realized by means of a magnetically active shape memory alloy material, which is loaded by a magnetic field (18) of a current flowing in the electric circuit, characterized in that the expansion unit (16; 30; 32; 34) mechanically driving a contact, particularly an interrupter contact (14), is provided adjacently to a coil-free current-carrying conductor section (10) of the electric circuit for magnetic interaction in such a manner that above the predetermined current threshold, a current flow in the current carrying conductor section generates a magnetic field which effects an expansion movement of the expansion unit which interrupts the electric circuit.
摘要:
Embodiments provide an electronic circuit breaker. The electronic circuit breaker has a moveable contact arm having a moveable main electrical contact, and a lockout mechanism operable to contact the moveable contact arm and block motion of thereof, the lockout mechanism having a lockout latch with one or more pivot joints, a moveable stop on, and an offset engagement portion, the moveable stop adapted to contact the moveable contact arm, and an unlock actuator providing an unlock force at the engagement portion causing lockout latch pivoting and release of the moveable contact arm. Also disclosed are secondary electrical contacts configured to engage each other in the ON configuration, with a leaf spring operably supporting a moveable one of the secondary contacts, the leaf spring configured to be flexed to close the secondary contacts. A method of operating the electronic circuit breaker is provided, as are other aspects.
摘要:
A molded case houses switching parts and includes a case main body and a cover placed on an upper portion of the case main body. The case main body includes a bottom portion case that forms a bottom portion of a circuit breaker and an intermediate case, placed on an upper portion of the bottom portion case, having a dividing wall that blocks off a space between the intermediate case and the bottom portion case. A power source side terminal block and second movable contact are fitted inside the bottom portion case, and a first movable contact, the load side terminal block, the contact portion, and the arc extinguishing chamber are fitted inside the intermediate case.
摘要:
An installation switching device which rapidly disconnects short-circuit currents is provided. A contact lever is arranged at least partially in an air gap in a magnetic circuit such that, in case of a short circuit, the interaction between current flow and magnetic flux within the air gap can result in an electrodynamic force effect, which leads to rapid opening of at least one contact point. A switching mechanism acts via a first operating connecting line on the contact lever to open the contact point and/or to keep it open. In case of overcurrent tripping, an overcurrent release acts, by a switching mechanism and via a second operating connecting line, on the switching mechanism to open the contact point and keep it open. In case of short-circuit tripping, the contact lever acts via a third operating connecting line on the switching mechanism to keep the contact point open.
摘要:
A load breaking switch including a rotor embodied as a switch shaft segment, and a contact arm pivotally mounted in the rotor pivotable between an ON and OFF position about an axis of rotation and at the free end of which is a contact piece which is pivotable with the contact arm and is in contact with an opposite fixedly arranged contact piece when the contact arm is in its ON position. Current flows through the switch via the contact pieces and the contact arm. The contact arm is pivotable into its OFF position when the current flowing via the contact pieces exceeds a rated current value or an overload current value. A magnetizable area is spatially arranged inside the rotor such that the current flowing through the contact arm in this area induces a magnetic field which exerts a torque on the contact arm.
摘要:
The disclosed concept provides for an operating mechanism in a overload relay assembly having a solenoid with a permanent magnet. The solenoid includes a ferrous output member. The solenoid moves the output member between a first retracted position and a second extended position. When the output member is in the first retracted position, the permanent magnet maintains the output member in the first retracted position. Thus, in a system wherein the overload relay assembly interrupts power to its own operating mechanism solenoid, the permanent magnet maintains the output member in the first retracted position even when the solenoid is de-energized.
摘要:
The present invention is directed to an electrical wiring device that includes an actuator assembly that is responsive to the fault detection signal. The actuator assembly includes a breaker coil configured to generate an actuation force in response to being energized. A circuit interrupter includes four sets of movable contacts configured to be driven into a reset state in response to a reset stimulus, the four sets of movable contacts being configured to be driven into a tripped state in response to the actuation force. A self-test circuit is coupled to the plurality of line terminals or the at least one sensor. The self-test circuit is configured to automatically generate a test signal from time to time during a predetermined portion of an AC power line cycle. The self-test circuit is configured such that the test signal is sensed by the at least one sensor when the at least one sensor is operational, the sensor output signal being a function of the test signal. A monitor circuit is configured to monitor the fault detection circuit or the actuator assembly; the mechanical actuation force is substantially inhibited when the fault detection circuit or at least a portion of the actuator assembly properly respond to the test signal. The monitor circuit generates an end-of-life response if the fault detection circuit or the actuator assembly do not respond to the test signal within a predetermined period of time.
摘要:
A movable contactor assembly for a current limiting type MCCB comprising: a terminal base; a plurality of movable contactors having a cam surface portion; a pair of holder plates supporting the movable contactors; a plurality of first springs providing an elastic force to the movable contactors; a plurality of extending plate portions provided to face the side of one end portion of each of the movable contactors so as to be electrically connected with the movable contactors; a plurality of flexible wire plates electrically connecting the movable contactors and the terminal base and having a portion bendable toward the movable contactors or toward the extending plate portions; and a second spring providing an elastic force to the flexible wire plates so as to be tightly attached to the movable contactor.
摘要:
A multi-pole circuit breaker comprising a single main housing containing multiple circuit breakers for protecting multiple branch circuits. Each of the circuit breakers comprises a single line terminal for receiving electrical current from a utility line, a plurality of load terminals for supplying electrical current from the single line terminal to a plurality of branch circuits via load lines, and a plurality of neutral terminals for receiving electrical current returned from the branch circuits via neutral lines Line conductors inside the main housing connect the line terminal to the plurality of load terminals. Sensors inside the main housing generate signals representing characteristics of the electrical current flow in the branch circuits, and a signal processor uses the signals generated by the sensors for detecting abnormal conditions in the branch circuits and generating trip signals in response to the detection of an abnormal condition. A single tripping mechanism between the line terminal and the load terminals receives the trip signals and interrupts the flow of current to the branch circuits in response to a trip signal.