Abstract: A molded case circuit breaker configured to protect its ports and cables is provided. The molded case circuit breaker comprises an electronic trip unit (ETU) including communication ports or a thermomagnetic trip unit (TMTU). The molded case circuit breaker further comprises a terminal cover configured to pass cables that connect to the communication ports of the ETU and pass the cables over lugs without touching the lugs. The molded case circuit breaker further comprises a cable box cover that protects the cables of the ETU from external harm. The terminal cover including an emboss fixture having emboss guides for alignment and fixing of the cable box cover. The electronic trip unit (ETU) or the thermomagnetic trip unit (TMTU) and the cable box cover are assembled with one or more screws. The cable box cover is prevented from falling after the one or more screws are taken out from the terminal cover regardless of how the circuit breaker is mounted.

Abstract: A power distribution box having a touch screen display on the exterior panel is configured to permit a user to monitor each fuse or circuit breaker contained within the power distribution box. A user may activate or deactivate a given fuse or circuit breaker by touching the corresponding image on the touch screen.

Abstract: A high voltage DC circuit interrupter that is provided with a double break contact where each contact is provided with an arc chamber. The double break contacts are provided in series with each other and an overcurrent measurement device such that if an overcurrent is measured, the contacts are simultaneously opened (i.e., double break) to lower the voltage that is developed across each of the sets of contacts. A handle is provided for simultaneously resetting and closing the sets of contacts.

Abstract: A circuit breaker crossbar assembly includes an elongate crossbar having a longitudinal axis, a first end and a second end, and having at least one support portion disposed therebetween. The crossbar is rotatable with respect to the longitudinal axis between a first rotational position and a second rotational position. The crossbar is coupleable to a plurality of moveable contacts of the circuit breaker. The support portion includes a first stop wall and a second stop wall defining a recess therebetween. A support structure is disposed in the recess, and comprises a support end pivotally coupled to the crossbar. The support structure has a first wall arranged to engage the first stop wall upon rotation of the crossbar toward the first rotational position, and a second wall arranged to engage the second stop wall upon rotation of the crossbar toward the second rotational position.

Abstract: Circuit breakers with handles have common trip cams with an integrated spring and trip cam base. The integrated spring directly contacts the armature in lieu of having the trip cam base formed to do so thereby allowing the use of alternative trip cam base configurations and materials from conventional relatively expensive materials.

Abstract: A power-switch having a switch housing and an electronic module, at least one contact being provided to tap a voltage at a primary conductor, and an adapter being provided to reduce the tapped voltage of said primary conductor.

Abstract: A multipolar electrical switch includes at least one central pole housing, which adjoins two adjacent pole housings of the switch. In at least one embodiment of the invention, an electrical switching mechanism for switching an electrical phase current on and off is contained in each of the pole housings respectively. The central pole housing is equipped with a fastening element, which extends through the central pole housing into the two adjacent pole housings, namely in each instance to at most the center of the adjacent pole housings.

Abstract: An object is to provide a gas circuit breaker having improved reliability. To solve the above-described problem, a gas circuit breaker is characterized by having a fixed contact, a movable contact configured to come into contact with or separate from the fixed contact, an insulating enclosure internally having the fixed contact and the movable contact, the inside of the insulating enclosure being filled with an insulating gas, and an operating mechanism configured to allow drive force for movement of the movable contact to be generated, wherein the operating mechanism includes a mover including permanent magnets or magnetic bodies disposed in a direction along which the operating mechanism allows the drive force to be generated, and a magnetic pole disposed to be opposed to the mover, and having a winding.

Abstract: A two-pole circuit breaker is provided that includes a first mechanical pole, a second mechanical pole and an electronic pole. The first mechanical pole includes a first armature having a first armature extension, and the second mechanical pole includes a second armature having a second armature extension. The electronic pole includes a first solenoid and a second solenoid, the first armature extension is disposed adjacent the first solenoid, and the second armature is disposed adjacent the second solenoid. Numerous other aspects are provided.

Abstract: The present invention relates to an electric protection apparatus comprising at least one switching module fitted on a mounting support, and a control device with an electromagnetic coil juxtaposed with one of the above-mentioned modules, this device comprising a magnetic shield arranged in a plane substantially perpendicular to the plane of the mounting support, said shield being located between the control device and the switching module situated closer to said device, facing the coil of the control device, and comprising at least one ferromagnetic part shaped in such a way that said shield performs magnetic guiding of the arc as soon as separation of the contacts takes place so as to increase the propulsion component of the Laplacian force acting on the arc as soon as separation of the contacts takes place.

Abstract: Electrical operation of circuit breakers utilizing a straight pull dc magnet system with positive means of locking in OFF position is provided. The operating dynamics have advantages in fault coordination and discrimination for motor branch circuits. The construction offers physical and economic advantages in control solutions.

Abstract: A switchgear includes a power supply built into a common housing, and at least two drives. The power supply can be fed by an external supply voltage and an external consumer can be connected to the two drives. In at least one embodiment, the switchgear includes, in the same housing, a built-in overload detection for the two drives and/or a built-in circuit breaker function for the two drives, and/or a built-in control circuit for the common control of the two drives. The switchgear can optionally be completed by a transformer providing an additional function of the targeted charging of a buffer capacitor and/or by an energy accumulator providing an additional function of the targeted discharge thereof by temporarily switching on a connected consumer.

Abstract: 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.

Abstract: Provided herein is a mechanism for correcting the deformation generated at a portion of the rotation pin between a single pole unit farthest away from a switching mechanism and a single pole unit adjacent thereto, and there is disclosed a correction plate provided at a portion of the pair of rotation pins located between a single pole unit farthest away from the switching mechanism and a single pole unit adjacent thereto, having a pair of rotation pin through hole portions to allow the pair of rotation pins to be penetrated, respectively, and a pair of adjustment extending portions extended in the direction in which the rotation pins penetrate at the upper or lower portion of the rotation pin through hole portions to determine the height of penetration allowance hole of the rotation pins together with the rotation pin through hole portions.

Abstract: A multi-phase Medium Voltage Contactor (100) comprising: for each phase, a fixed contact (103) and a movable contact (104) positionable between an open position, in which it is operatively disconnected from the fixed contact (103), and a closed position in which it is operatively connected to the fixed contact (103); an electromagnetic actuator (10) operatively connected to the movable contact (104) and positionable between a first open position corresponding to the open position of the movable contacts (104), and a second closed position corresponding to the closed position of the movable contacts (104); a manual opening device (20) operatively connected to the electromagnetic actuator.

Abstract: A molded case circuit breaker having a trip unit with one or more integrally formed dielectric protrusions that are configured to slidably interconnect with corresponding dielectric members of the base when the trip unit is secured to the base. The dielectric protrusions extend from dielectric walls located between adjacent enclosure chambers that house the current transformers and are configured to remain in contact with the dielectric members of the base as the trip unit is being moved with respect with the base. By remaining in contact to one another while the trip unit is moved with respect to the base, the dielectric protrusions, along with the dielectric members, maintain a strong dielectric barrier within the exterior spaces between the CT enclosure chambers, thereby preventing debris from traveling between and accumulating on the trip unit and the base.

Abstract: A circuit breaker comprises a latching plate rotatably coupled to a moveable plate, and tensile type latching springs, each latching spring having two ends fixed to the latching plate and the moveable plate, respectively. Time taken for a moveable contact to be lifted up from a contact time point between the moveable contact and a fixed contact may be shortened, and thus a time duration for which an accident current flows may be reduced. Accordingly, the amount of energy applied to the circuit breaker may be reduced, and a breaking function of the circuit breaker may be enhanced. Furthermore, since a contact pressure between the moveable contact and the fixed contact has a constant change, a reliability on a conductive state of the moveable contact and the fixed contact may be enhanced.

Abstract: The present invention relates to an electric protection apparatus comprising at least one switching module fitted on a mounting support, and a control device with an electromagnetic coil juxtaposed with one of the above-mentioned modules, this device comprising a magnetic shield arranged in a plane substantially perpendicular to the plane of the mounting support, said shield being located between the control device and the switching module situated closer to said device, facing the coil of the control device, and comprising at least one ferromagnetic part shaped in such a way that said shield performs magnetic guiding of the arc as soon as separation of the contacts takes place so as to increase the propulsion component of the Laplacian force acting on the arc as soon as separation of the contacts takes place.

Abstract: Disclosed is a mold cased circuit breaker (MCCB) comprising a plurality of single pole breaking units simultaneously opened and closed by a pair of common shaft pins. The MCCB effectively transmits a torque for opening or closing contacts to adjacent single pole breaking unit for electrical pole with a minimized loss, and prevents the shaft pins from being bent. The MCCB comprises a crank installed across the pair of shaft pins so as to connect the shaft pins to each other.

Abstract: A support for anchoring a trip unit of a circuit breaker to a base thereof to prevent separation of the trip unit from the base during a short circuit fault. The support has top-facing two locking tabs that snap into place behind a wall in a lug-receiving area of the base. The support also has an opening through which a terminal of the trip unit is received snugly. The locking tabs keep the support in place and prevent forces produced by gasses during a fault from forcing the trip unit away from the base. The terminal, attached to the trip unit, is retained by the opening, which transfers upward forces to the top of the support, which is positioned against a top section of the base. The snug fit by the terminal through the opening and retention of the support in the lug-receiving area during a fault increases post-fault dielectric performance.

Abstract: Disclosed are an elastic pressing unit and a molded case circuit breaker having the same, the molded case circuit breaker including, a plurality of fixed contacts, a plurality of movable contacts disposed to be rotatable between a closing position contacted with the corresponding fixed contacts and a breaking position or trip position separated from the corresponding fixed contacts, a rotation pin disposed to be simultaneously connected to the movable contacts, a mechanical unit connected to the rotation pin so as to allow the movable contacts to be simultaneously rotatable, and an elastic pressing unit configured to apply an elastic force to the rotation pin such that the rotation pin is rotated toward the closing position, whereby component deformation can be prevented, resulting in ensuring operation reliability and stability of the mechanical unit.

Abstract: A protection switch includes a plurality of single-pole protection switch modules in a mechanically coherent unit forming a multi-pole protection switch configuration. Each module includes a housing, a switching arm, a moving contact on the switching arm pivotably movable against a fixed contact between closed and open positions, a manual operating mechanism for adjusting the switching arm between the closed and open positions and a tripping mechanism for automatically resetting the switching arm into the open position upon a tripping condition. The manual operating mechanisms of all modules are coupled so that the modules are only switched jointly. The tripping mechanisms of all modules are coupled so that the tripping mechanism of each also trips all others. A one-piece coupling is insertable between adjoining modules for both mechanically fixing the modules to one another and coupling the manual operating mechanisms and the tripping mechanisms of the adjoining protection switch modules.

Abstract: An add-on module adapted to be attached to the basic mechanical structure of a multi-pole circuit breaker includes multiple extended terminal plates each of which is adapted to replace one of the input and output terminals for one of the poles, multiple electromechanical transducers each of which is coupled to one of the extended terminal plates for producing a mechanical movement in response to a predetermined magnitude of electrical current in the extended terminal plate to which that transducer is coupled, a mechanical actuator coupled to the electromechanical transducers and to the breaker contacts for operating a trip mechanism in response to a predetermined mechanical movement of any of the transducers, and a mechanical reset arm coupling the reset mechanism to the mechanical actuator for resetting the actuator in response to the resetting of the host circuit breaker.

Abstract: An add-on module adapted to be attached to the basic mechanical structure of a multi-pole circuit breaker includes multiple extended terminal plates each of which is adapted to replace one of the input and output terminals for one of the poles, multiple electromechanical transducers each of which is coupled to one of the extended terminal plates for producing a mechanical movement in response to a predetermined magnitude of electrical current in the extended terminal plate to which that transducer is coupled, a mechanical actuator coupled to the electromechanical transducers and to the movable contacts for operating the trip mechanism in response to a predetermined movement of any of the transducers, and a calibration element for adjusting mechanical movement of at least one of said multiple electromechanical transducers so as to control an aspect of trip actuation.

Abstract: An installation switching device includes a housing, a main contact point having an arc quenching chamber, an input terminal, an output terminal, an impact-style armature system configured to move the main contact point to an open position, a latching mechanism having a latching point and configured to open an isolating contact point disposed in a secondary current path parallel to a main current path, a main thermostatic bimetallic strip configured to act on the latching point to as to cause the main contact point to remain in the open position, a current limiting resistor disposed in the secondary current path, a selective thermostatic bimetallic strip disposed in the secondary current path and configured to act on the latching mechanism, a handle configured to act on the latching mechanism so as to open and close the main contact point, and a phase connecting rail.

Abstract: An add-on module adapted to be attached to the basic mechanical structure of a multi-pole circuit breaker includes multiple extended terminal plates each of which is adapted to replace one of the input and output terminals for one of the poles, multiple electromechanical transducers each of which is coupled to one of the extended terminal plates for producing a mechanical movement in response to a predetermined magnitude of electrical current in the extended terminal plate to which that transducer is coupled, and a mechanical actuator coupled to the electromechanical transducers and to the breaker contacts for operating a trip mechanism in response to a predetermined mechanical movement of any of the transducers.

Abstract: An embodiment of the present invention discloses an electromagnetic switching device including a housing including a mounting side and a connector side opposite the mounting side. The connector side includes one first and second main connection area for connecting first and second main lines to first and second fixed main contacts disposed in the interior of the housing. In the interior of the housing, movable main contact bridges are disposed via which one main current path each main current path includes one of the first fixed main contacts, one of the second fixed main contacts, and one of the main contact bridges. The main connection areas are located opposite one another. One first and one second central area are disposed between the main connection areas. The central areas each extend from the first to the second main connection area. The central areas are elevated relative to the main connection areas and disposed next to one another viewed from the first to the second main connection area.

Abstract: A bimetal in a circuit breaker can deflect in a first direction or a second direction depending upon conditions. If the bimetal deflects in the second direction it can increase the force necessary to operate a trip mechanism of the circuit breaker. A yoke stop helps to control bimetal deflection forces and thus, the amount of force necessary to operate the trip mechanism. This allows better control, size, and selection of operating parts for the circuit breaker.

Abstract: A multi-pole circuit breaker and method include at least two breaker modules including circuit breakers therein. The circuit breakers include a moveable arm configured to connect and disconnect contacts therein. The at least two modules including armatures connectable to the moveable arms of each of the at least two modules. A center module connects the at least two modules. The center module includes an actuator and a beam connected to the actuator at a mid-portion. The beam connects to each armature of the at least two modules wherein under a trip condition the actuator displaces the beam to simultaneously trip the at least two modules using the armatures.

Abstract: A method and a device are disclosed for the secure operation of a switching device including at least one main contact which can be switched on and off and which includes contact pieces and a displaceable contact bridge, and at least one control magnet which includes a displaceable anchor. The anchor and the contact bridge are actively connected to each other such that the corresponding main contact can be opened or closed when switched on and off. In at least one embodiment, the method includes the following: a) the path difference, which returns the anchor after switching on and off, is recognised, b) devices which are used to open welded main contacts are released by a release device when the recognised path difference exceeds a predetermined value and a specific time duration of time has run out after switching off.

Abstract: A mechanism for a circuit breaker contact arm that allows current limiting by reducing the opening time is disclosed. A secondary trip assembly is arranged to actuate due to magnetic forces generated during an undesirable electrical condition such as a short circuit. The secondary trip system releases a contact arm assembly allowing the contact arm to rotate to an open position that interrupts the flow of electrical power.

Abstract: A circuit breaker for overcurrent protection and earth leakage protection includes a main housing, a circuit board, a zero-phase current transformer, an earth leakage detection circuit, a trip coil, a sensitivity current-switch, an action time switch, and an earth leakage test switch. The earth leakage detection circuit, the sensitivity current-switch, the action time switch, and the earth leakage test switch are mounted on the circuit board and installed in the main housing.

Abstract: A circuit breaker is disclosed. The circuit breaker has a single pole module housing having a 1 W width with a first conduction path and a second conduction path disposed within the single pole module housing. The first and second conduction paths are electrically isolated from each other via an interior wall of the single pole module housing. A first activation mechanism is in operable communication with the first conduction path and a second activation mechanism is in operable communication with the second conduction path. The first activation mechanism is in operable communication with the first conduction path independent of the second activation mechanism and the second conduction path. The second activation mechanism is in operable communication with the second conduction path independent of the first activation mechanism and the first conduction path.

Abstract: A multipole switching device selectively switches electrical power from an electrical power source to a load circuit. A first control device comprises a housing mountable in a panel, an electromechanical actuator in the housing including a movable plunger, and an electrical switch in the housing operated by the plunger. A second control device comprises a housing mountable in a panel, adjacent the first control device, a mechanical actuator in the housing including a movable link, and an electrical switch in the housing operated by the movable link. A third control device comprises a housing mountable in a panel, adjacent the second control device, an electromechanical actuator in the housing including a movable plunger, and an electrical switch in the housing operated by the plunger. A tie linkage mechanically ties the first control device plunger and the third control device plunger to the movable link.

Abstract: A method and a device are disclosed for the secure operation of a switching device including at least two main contacts which can be switched on and off and which includes respectively, contact pieces and a displaceable contact bridge, and at least one control magnet which includes a displaceable anchor. The anchor acts upon the contact bridge when it is switched on and off such that the corresponding main contact is opened or closed. At least one embodiment of the inventive method includes the following steps: a) release device for a force element remains in a first state in order to interrupt the main contact as long as the main contacts are closed when switched on and open when switched off, and b) the release device are transferred into a second state if at least the main contact is welded after switching off.

Abstract: A power switching apparatus includes a breaker unit, an operating unit, a measuring unit, and a controlling unit. The breaker unit is connected on a three-phase current line, and includes switches each corresponding to one of phases of the three-phase current line. The operating unit simultaneously turns on or off the switches. The measuring unit measures a current flowing in each phase, and determines a time point where current flowing in one of the phases becomes zero as a reference time point. The controlling unit controls, when interrupting load current, the operating unit to turn off the switches in a range from 20 degrees to 40 degrees of an electric angle from the reference time point.

Abstract: A switching device for selectively switching electrical power from an electrical power source to a load circuit comprises a housing. An electromechanical actuator is in the housing. A fixed contact is fixedly mounted in the housing. A contact arm is pivotally mounted in the housing. The contact arm carries a movable contact and has a lever. The contact arm is operatively connected to the actuator to be selectively positioned thereby for selectively electrically contacting the moveable contact with the fixed contact. A rotational actuator is rotationally mounted to the housing. The rotational actuator includes a leg proximate the lever so that rotational movement of the rotational actuator pivotally moves the contact arm to override the electromechanical actuator.

Abstract: A circuit breaker includes an enclosure with a first side and a second side opposite and distal from the first side. A number of separable contacts are enclosed by the enclosure. An operating mechanism is structured to open and close the separable contacts. A plurality of terminals are electrically interconnected with the number of separable contacts. The terminals protrude through the second side of the enclosure. A number of phase barrier apparatus is disposed on the second side of the enclosure. Each of the number of phase barrier apparatus includes a plurality of separate phase barrier members, each of which is disposed about a corresponding one of the terminals, and a number of interlocking members. Each of the number of interlocking members interlocks with an adjacent pair of the separate phase barrier members.

Abstract: A spring assembly is provided for a yoke assembly of an electrical switching apparatus including a housing, separable contacts enclosed by the housing, and an operating mechanism structured to open and close the separable contacts. The operating mechanism includes a pole shaft. The yoke assembly is coupled to the pole shaft and is movable among first and second positions corresponding to the separable contacts being closed and open, respectively. The spring assembly includes a number of first springs having a first spring rate and being coupled to the yoke assembly, and a number of second springs having a second spring rate and being coupled to the yoke assembly. The second spring rate is different than the first spring rate. The number of first springs and the number of second springs bias the yoke assembly toward the second position.

Abstract: A circuit breaker assembly is disclosed. The assembly includes a base having an interior bottom surface that includes a first engagement feature and a circuit breaker cassette having an exterior bottom surface that includes a second engagement feature. The cassette is oriented in the base to provide for a current path through the base in a first direction. The first engagement feature engages with the second engagement feature and restrains movement of the cassette relative to the base in a second direction that is perpendicular to the first direction and parallel to the interior bottom surface.

Abstract: Disclosed herein is a breaker interlock system. The system includes, a trip unit for a breaker, and a breaker receptive of the trip unit. The breaker is closable when the trip unit is assembled thereto and the breaker is non-closable when the trip unit is not assembled to the breaker. The interlock system is further configured to prevent disassembly of the trip unit from the breaker when the breaker is in a closed configuration. The breaker having a plurality of solenoids and each of the plurality of solenoids is in operable communication with the breaker to trip the breaker on command. A first of the plurality of solenoids is responsive to a signal from the breaker via the trip unit, and a second of the plurality of solenoids is responsive to an externally supplied signal from a source other than the electronic trip unit.

Abstract: The present invention relates to an adapter device for connection of a low voltage switching device to a distribution bus bar system. The adapter device comprises a body provided with a front wall, which can be connected to the switching device, and a back wall, opposite the front wall. The device comprises first electrical terminals susceptible to electrically contact one of the distribution bus bars and second electrical terminals. The device also comprises first electrical connections electrically connected to first electrical terminals and which can be coupled with corresponding third electrical connections of the switching device. The adapter device is also provided with second electrical connection means connected to corresponding second electrical terminals and which can be coupled with corresponding fourth electrical connections of the switching device.

Abstract: A thermal and/or magnetic overload trip device for an electrical switching device having multiple poles includes a housing having a housing member configured to receive a plurality of functional elements and being at least partially closable, The overload trip device further including a conductor strap associated with each of the multiple poles, each conductor strap having an associated housing portion, and a rotatable trip shaft configured to rotate between a rest position and an actuating position so as to trip an associated switching mechanism. The overload trip device further including at least one rotatable adjusting element configured to set the at least one of the presettable thermal threshold and the presettable magnetic threshold. Further, the housing member is configured so that the functional elements is insertable therein and is couplable to the housing member.

Abstract: A multipole switching device for selectively switching electrical power from an electrical power source to a load circuit comprises a first control device comprising a housing, an electromechanical actuator in the housing including a movable plunger, and an electrical switch in the housing operated by the plunger. A second control device comprises a housing mountable adjacent the first control device, an electromechanical actuator in the housing including a movable plunger, and an electrical switch in the housing operated by the plunger. A tie linkage mechanically ties the first control device plunger to the second control device plunger.

Abstract: A circuit breaker and method includes a mechanical pole moveable between a latched position and an unlatched position to open an electrical connection between a pair of electrical contacts. An electronic tripping device is configured to respond to a sensor signal. The sensor signal is output from a condition sensor wherein upon receiving the sensor signal the electronic tripping device trips the mechanical pole into the unlatched position.

Abstract: The present invention relates to a family of resettable circuit interrupting devices that eliminates the need to rewire a resettable circuit interrupting device after it is installed and powered up to correct for a reverse wiring conditions.

Abstract: A protection switch includes a plurality of single-pole protection switch modules in a mechanically coherent unit forming a multi-pole protection switch configuration. Each module includes a housing, a switching arm, a moving contact on the switching arm pivotably movable against a fixed contact between closed and open positions, a manual operating mechanism for adjusting the switching arm between the closed and open positions and a tripping mechanism for automatically resetting the switching arm into the open position upon a tripping condition. The manual operating mechanisms of all modules are coupled so that the modules are only switched jointly. The tripping mechanisms of all modules are coupled so that the tripping mechanism of each also trips all others. A one-piece coupling is insertable between adjoining modules for both mechanically fixing the modules to one another and coupling the manual operating mechanisms and the tripping mechanisms of the adjoining protection switch modules.

Abstract: A retrofit assembly structured to allow a CM22 type circuit breaker to engage, and be enclosed by, a CMD type circuit breaker tank is provided. The retrofit assembly includes a levering mechanism, a circuit breaker bus assembly having bus support members, and a door handle system structured to allow a user to actuate the circuit breaker contacts when the tank is closed.

Abstract: Disclosed are a multi-pole circuit breaker and an apparatus for preventing deformation of a driving shaft thereof. The multi-pole circuit breaker includes: a plurality of single pole breaking units having a pair of fixed contactors, a movable contactor, and shafts; a switching mechanism disposed on a certain one of the plurality of single pole breaking units; a pair of driving shafts connected to each shaft; and a driving shaft deformation prevention unit disposed between the single pole breaking unit, spaced relatively far from the switching unit among the plurality of single pole breaking units, and the adjacent single pole breaking unit.

Abstract: Disclosed is a multi-pole circuit breaker. The multi-pole circuit breaker includes: a substrate disposed between the single pole breaking unit, spaced relatively far from the switching mechanism as compared to the other single pole breaking units among the plurality of single breaking units, and the adjacent single pole breaking unit; a link mechanism rotatably supported on the substrate; and springs having one ends supported by the substrate and the other ends supported by the link mechanism.