Abstract: The invention relates to a mounting plate arrangement having a mounting plate which is fixed to a frame of a switch cabinet via at least one mounting plate holder, the mounting plate holder having a bearing piece which bears against or is fixed to a lower longitudinal edge of the mounting plate, the mounting plate with the bearing piece resting on a horizontal strut of the frame via a mounting bracket of the mounting plate holder, wherein at least a contact side of the bearing piece, via which the bearing piece rests on the mounting bracket, is or comprises a damping element.

Abstract: A power converter suitable for power elements of different sizes including a base, a heat sink, a circuit board and a power element is provided. The base has a partition and an opening. The partition has a first step surface and a second step surface. The first step surface and the second step surface are located at different levels. The heat sink is mounted on the base and leans against one of the first step surface and the second step surface of the partition. The circuit board is assembled on the base. The power element is disposed on the circuit board and contacts the heat sink through the opening.

Abstract: A mounting system (1) arranges electric devices (2), especially in switchgear cabinets. The mounting system (1) includes at least one preferably horizontal mounting strip (3) to which at least one device (2) can be secured. An ordering assembly (8) can be connected to the mounting strip (3) and used for ordering the connecting wires (34, 35) of the device (2) to be secured to the mounting strip (3). Ordering assembly (8) has a plurality of ordering segments (7, 9, 11) along the longitudinal direction of the mounting strip (3). The ordering segments are interconnected or rest against one another. One or more ordering segments (7, 9, 11) can be selectively detached from the ordering assembly (8) and can be removed from ordering assembly (8) to leave a gap (8) or be replaced by another ordering segment (7, 9, 11).

Abstract: A sealed plug-in circuit breaker panel has an enclosure defining a sealed interior portion. The enclosure includes a housing, a face plate removably coupled to the housing and a front seal member disposed between the face plate and the housing such that the face plate and the housing are sealingly engaged. The panel further includes an electrical bus structure coupled to the housing, a plurality of first plug-in members coupled to the bus structure and a number of circuit breakers disposed in the enclosure. Each circuit breaker includes a manual operator and at least a pair of second plug-in members which are electrically coupled to corresponding first plug-in members. The manual operator protrudes through and extends from a respective aperture formed in the face plate. The panel further includes a number of feeders and load connectors electrically coupled to the bus structure.

Abstract: A switchgear mounting assembly for a load center includes a base assembly, an electrical bus assembly, and a bracket. The base assembly includes a base and a central protrusion extending outwardly from the base. Bus bars are electrically connected and mechanically coupled to the central protrusion and include stabs, which extend radially outwardly from the central protrusion. The bracket is coupled to the central protrusion and includes supporting elements. Each supporting element maintains a corresponding electrical switching apparatus in electrical communication with a corresponding one of the stabs. The switchgear mounting assembly is therefore structured to mount the electrical switching apparatus in a radial array extending around the central protrusion.

Abstract: A guide assembly for a switchgear assembly is provided. The guide assembly includes an elongated support member and a passage. The support member is coupled to and extends from a housing assembly rear sidewall. The support member extends in the circuit breaker assembly direction of travel. The passage is disposed on the circuit breaker assembly base and also extends in the circuit breaker assembly direction of travel. The support member is substantially aligned with the passage. In this configuration, as the circuit breaker assembly moves between a withdrawn position and an installed position, the support member moves between a first position, wherein the support member is not disposed in the passage, and a second position, wherein the support member is partially disposed in the passage. When the support member is in the second position, the support member bears a portion of the weight of the circuit breaker assembly base.

Abstract: A low-profile electronic circuit breaker includes first and second electrical branches coupled to respective first and second load terminals. The electronic circuit breaker also includes an electronic processing circuit configured to monitor an electrical condition in the first and second electrical branches. The electronic circuit breaker is packaged in a housing sized to occupy a standard single-pole breaker panelboard location. In some embodiments, the electronic circuit breaker has no load neutral terminals associated with the first and second load terminals. Methods of assembling an electronic circuit breaker are provided, as are other system and method aspects.

Abstract: A power supply apparatus for a vehicle is provided which supplies electric power to a power supply unit and charges electric power from the power supply unit via a power port. The vehicle includes a plurality of power inverter circuits which are connected to a common storage unit in parallel. The plurality of power inverter circuits include an electric power transferring power inverter circuit connected to the power port via an electric power transferring electric path, and are divided into a first category including the electric power transferring power inverter circuit and a second category. The power supply apparatus includes a connection prohibiting unit which realizes a state in which the power inverter circuit included in the first category is electrically connected to the storage unit, and the power inverter circuit included in the second category is disconnected from the storage unit.

Abstract: A motor control center unit comprising multiple feeders is described. The unit may also contain a common breaker interlock release configured to lock out breakers for all of the feeders. The breakers of the multiple feeders and the breaker interlock release may be accessible and operable through an isolation cover of the motor control center unit.

Abstract: A receiving module is disclosed for building into a switching cabinet, with a primary circuit mating contact element.

Abstract: An electrical panelboard enclosure includes an enclosure housing with an interior equipment chamber accessible by way of a service entrance door. A service panel is configured to receive power from a main power source. A main power breaker has a main power breaker toggle switch and is positionable between a power-on state and a power-off state to selectively activate and deactivate the main power. A power cutoff switch mechanism is operable from outside the service entrance door and is positionable between a power-on state and a power-off state to mechanically engage and deactivate the main power breaker toggle switch and cutoff the main power without opening the service entrance door. A lockout system is operable to prevent the service entrance door from being secured in a closed position unless the main power breaker and the power cutoff switch mechanism are in the same state.

Abstract: An electrical core comprising an assembly of power management and distribution contactors is provided. The power management contactors are attached to a first support element and the distribution contactors are carried by a second support element superimposed on the first so as to form a multilayer assembly. The distribution contactors are arranged in double symmetry about two axes perpendicular to one another. They are mechanically linked through a mechanical linkage element extending between two rows of contactors and which carries electrical connection elements connecting the contactors to an element for connecting to a power source. The contactors are assembled in modules according to their type. In particular, the management module comprises at least one modular element common to the power management contactors which is suitable for performing a given secondary function other than the function of establishing a contact.

Abstract: An apparatus is provided and includes two or more sensor assemblies, each including a sensing unit at a front face thereof, and each being communicatively interconnected and power sharing, a cover plate, mounted adjacent to the front face of the sensor assemblies to entirely cover the sensing units, through which user commands are transmittable, and a wall box, onto which the sensor assemblies and the cover plate are mountable, including a housing in which a space is defined for housing of one or more devices, each device being controllable by the sensor assemblies in accordance with the user commands, and each device being disposed to fit within the space and to be in signal communication with at least one of the sensor assemblies.

Abstract: A recreational vehicle user interface (RVUI) system/method that allows centralized control and monitoring of electrical/environmental subsystems within the context of a recreational vehicle is disclosed. The system/method permits monitoring of a wide variety of electrical/environmental subsystems in this context, including but not limited to battery temperatures, battery voltages, overall system voltages, battery disconnect relays, vent fans, solar panels, cabin temperatures, battery temperature alarms, power converter modules, temperature sensitive power converters, load management controllers, AC distribution controllers, transfer switches, AC/generator inputs, storage tank levels, pumps, and other electrical loads.

Abstract: A sealed electrical enclosure for housing an electrical component is provided. In one exemplary embodiment, the sealed electrical enclosure includes a housing, a first and second electrical connector, an actuator, and a terminal. The housing has a sealed interior when a top portion is coupled to a bottom portion. The first electrical connector extends from the sealed interior through the bottom of the housing and is electrically coupled to the electrical component. The actuator extends from the sealed interior through the housing and is configured to manipulate the electrical component. The terminal is electrically coupled to the second electrical connector. The second electrical connector is configured to mate with the first electrical connector. The first and second electrical connectors are configured to be connected and disconnected to attach and remove the housing to and from the terminal.

Abstract: A device for disconnecting electrical power from a first stack of meter modules, wherein the power is supplied by a main box that also supplies power to a second stack of meter modules. The device includes an incoming bus section for receiving power from the main box and an outgoing bus section for feeding power to the first stack of modules. In addition, the device includes a cross bus device connected to the incoming and outgoing bus sections and a circuit breaker connected to the cross bus device. When the circuit breaker is closed, power is supplied to the first and second stacks of modules. When the circuit breaker is opened, power to the first stack of modules is disconnected while power to the second stack of modules is maintained.

Abstract: An electric connection box has a circuit board, a conductive member (a first bus bar, a second bus bar, a first connection fitting, a second connection fitting, or a lead terminal) connected to the circuit board and extending in the direction away from the circuit board, a relay provided at the end of the conductive member which is located on the opposite side of the circuit board, and a case for receiving the circuit board and having an opening provided at a position corresponding to the relay. The relay is exposed at the opening to the outside of the case.

Abstract: A loadcenter is equipped with a unitary neutral bus bar capable of receiving AFI and GFI circuit breakers having either a plug-on-neutral connection or a wire-neutral connection. The neutral bus bar is connected to line neutral and has a rolled rail that is formed by rolling an end of a conductive plate and bending the plate at a transition portion to position the rolled rail above and at an angle of a major flat surface of an extension of the neutral bus bar. Wire-capture apparatuses secured along an edge of an extension of the neutral bus bar can capture wires from circuit breakers that lack an internal connection to a neutral plug-on mounting jaw or that lack a neutral plug-on mounting jaw altogether.

Abstract: Various embodiments provide safety disconnect systems for a power system. In one aspect, a safety disconnect system includes an enclosure operative to receive a plurality of input power lines into the enclosure and provide a plurality of output power lines out of the enclosure. Each input power line is coupled to and paired with a corresponding one of the output power lines, where each input power line and output power line is operative to provide power from a power source. A plurality of switches are provided in the enclosure, each of these switches coupled between an associated one of the pairs of input power line and output power line, and each switch operative to disconnect the associated input power line from the corresponding output power line.

Abstract: This disclosure describes examples of an apparatus to enclose components of a switching assembly of an automatic transfer switch. In one embodiment, the apparatus, or arc chamber cover, has a housing made of material with optical properties that permit observation of the interior of the housing. A mounting assembly couples to the housing. The mounting assembly secures the apparatus to the automatic transfer switch. In one example, the mounting assembly comprises feet comprising a material with mechanical properties that can withstand pressure and other forces inside of the interior chamber. The apparatus also includes one or more baffles to control the flow of gasses and control electric arcs within the switching assembly.

Abstract: There is provided an electric junction box (1) which can reduce the usage of the heat-resistant resin for a connector fitting portion. The electrical junction box (1) includes a case (4) including a box-like body (3) and a box-like body (2) to be assembled together, a substrate (5) received in the case (4), a connector fitting portion (9) arranged to engage with a connector and having a terminal (6) soldered to the substrate (5) with lead-free solder, a holding portion (19) holding the terminal (6), and a tubular outer wall (8) surrounding the terminal (6). The holding portion (19) and the outer wall (8) are formed as separate parts. The outer wall (8) is divided into two segments formed integrally with the box-like bodies (3, 2), respectively. The holding portion (9) is made of heat-resistant resin while the outer wall (8) is made of non-heat-resistant resin.

Abstract: A power supply system is disclosed which comprises a printed circuit board (10) having on one side of the substrate thereof a live track (58), a neutral track (54) and a switched live track (52). A switch (30) when closed connects the live track to the switched-live track (52). The tracks (52, 58) connect live input terminal (12) to a live output terminal (20) and a neutral input terminal (16) to a neutral output terminal (18). A second switched-live track connected to the track (58) is provided on the opposite side of the substrate.

Abstract: An electrical panelboard enclosure includes a primary service panel configured to receive power from a main power source and an alternate power source, an alternate power source connector array, and a distribution panel that delivers main or alternate power to subsidiary load circuits. A service transfer switch unit includes a main power breaker and an alternate power breaker having mutually interlocked toggle switches for respectively activating/deactivating the main and alternate power. The panelboard enclosure further includes a power cutoff switch operable from outside a service entrance door of the enclosure to mechanically engage and deactivate the main power breaker toggle switch.

Abstract: A circuit breaker panel includes a number of circuit breaker modules each having a number of connectors, a plurality of circuit breakers and a circuit structure supporting the circuit breakers and electrically interconnecting the circuit breakers with the number of connectors. The panel also includes a monitoring module having a connector and a monitoring circuit to monitor at least one line voltage and, for each of the circuit breakers, at least one load voltage. The panel further includes a frame having a first connector for the monitoring module connector, a number of second connectors for the circuit breaker module connectors, and a number of third connectors for outputs from the circuit breaker modules. Conductors are connected to the connectors. Any of the monitoring module and the number of circuit breaker modules can be installed into or removed from the frame without change to the conductors.

Abstract: A motor control center unit comprising multiple feeders is described. The unit may also contain a common breaker interlock release configured to lock out breakers for all of the feeders. The breakers of the multiple feeders and the breaker interlock release may be accessible and operable through an isolation cover of the motor control center unit.

Abstract: An electricity feeding control device is provided with an air hole (31c) which is formed by penetrating a part of a peripheral wall of a body (31) constituting a part of a housing case (3). The housing case (3) is provided in its inside with an inner pressure adjusting sheet (5), formed with a breathable and waterproof member, and arranged so as to cover the air hole (31c) from the inside of the housing case (3). The air hole (31c) comprises a long recess (31c2) formed in an outer surface of the body (31), a communicating hole (31c1) consecutively formed in one end of a longi-tudinal direction of the recess (31c2) and communicated with an inner surface of the body (31), and a shielding plate (33) attached in the outer surface of the body (31) so as to cover a region other than the other end of the longitudinal direction of the recess (31c2), in a region of an opening section (31c3) of the recess (31c2).

Abstract: A transfer switch enclosure is provided for housing a transfer switch that selectively connects a load to either a utility electrical grid or a stand-by electrical generator. The utility connection includes a first switch selectively connecting utility power to a load. The transfer switch selectively connects the load to either the utility power or a secondary power source. The housing includes a divider panel, providing two separate chambers in the housing. The utility connection is mounted in one of the chambers and the transfer switch is mounted in the other of the chambers. The divider panel includes an opening to permit a pair of electrical conductors to pass therethrough for connecting the utility switch to the transfer switch. The housing further includes two door panels, each door panel covering one of the two chambers. Each door panel is independently operable and securable, controlling access to each of the two chambers.

Abstract: A computer mouse includes a housing, a first container secured in the housing, and a second container secured in the first container, a timing unit, and a processor. The first container defines through holes. The first container and the second container are spaced by a distance to define a receiving space being partly filling in liquid. Suspending members extends through the through holes. One end of the suspending member is received in the receiving space. The density of the suspending members is less than that of the liquid Sensitive switches are attached to the first container. A method for the mouse includes determining whether any one of the second contacts is charged; generating a position signal, controlling the timing unit to time; determining the movement direction of the a cursor; determining the movement distance of the cursor; and generating cursor control signal for controlling movement of the cursor.

Abstract: The invention relates to a circuit arrangement with an electronic power switch, a capacitor and a plate-shaped direct current laminate. The direct current laminate includes two metal plates insulated from one another for carrying current and multiple connection elements arranged so to electrically connect the metal plates to the capacitor. The capacitor is electrically connected by the connection elements to the direct current laminate, and the capacitor is on one side of the direct current laminate. This circuit arrangement has a significantly reduced space requirement and simultaneously improved scalability. This is achieved because the direct current laminate additionally has multiple connection elements arranged so to connect the direct current laminate to the electronic power switch of the circuit arrangement. The electronic power switch is electrically connected by the connection elements to the direct current laminate and is arranged on the opposing side of the direct current laminate.

Abstract: A load center assembly comprising a main circuit breaker configured to be connected with bus plates through side openings in the main circuit breaker is described. The openings in the main circuit breaker comprise plug-on clips by which the bus plates connect. The plug-on clips are configured to use friction to grasp the bus plates as the bus plates are slidably inserted between the jaws of the plug-on clips.

Abstract: An electrical device, a method of manufacturing a HVAC unit and a HVAC unit employing the electrical device are disclosed herein. In one embodiment, the electrical device includes: (1) a contact configured to indicate a status of the electrical device and (2) terminals configured to terminate connections, the terminals having: (2A) a pair of functional terminals internally connected across the contact and (2B) a pair of jumpered terminals independent of the pair of functional terminals and internally connected together. Designated combinations of the terminals indicate a circuit configuration for the electrical device with each of the terminals having a particular design that dictates a specific corresponding connection header be used for each of the designated combinations.

Abstract: A power electronic assembly includes a pair of thermally and electrically conductive plates, and semiconductor switching elements positioned between contact surfaces of the pair of conductive plates. A first of the semiconductor switching elements is positioned at a first region of the conductive plates, and a second of the semiconductor switching elements positioned at a second region of the conductive plates. At least one of the conductive plates includes an aperture positioned between the first region and the second region of the conductive plates, such that in a compressed state, a contact surface of the conductive plate associated with the first region is substantially parallel to and offset from that of the second region in a direction parallel to the direction of compression.

Abstract: A receiving module is disclosed for building into a switching cabinet, with a primary circuit mating contact element.

Abstract: An interlock arrangement includes a pair of slidable lockouts operatively associated with utility and generator side switches of an electrical panel. Together with either an interlinked member or a rocker lockout, the interlock arrangement sequences manual switching of the utility and generator side switches according to a pre-defined switching sequence, such as a seven step sequence or a five step sequence.

Abstract: A power distribution system has a bus bar and a gallium nitride based semiconductor switch interrupting the bus bar. A controller is electrically coupled to, and controlling, the semiconductor switch.

Abstract: A power mains distribution panel including a data signal coupler providing a data path across multiple circuits therein. The power mains distribution or breaker panel provides mains power distribution from multiple non-neutral (i.e. having a voltage and providing a flow of current relative to each other or a common or neutral wire or virtual point, also called ‘hot’) mains circuits of a single or multiple phase for distribution within the distribution or breaker panel to branch circuits which in turn have a data path therebetween according to the present invention. Also described is a particular data signal coupler which may be used in the embodiments of the power mains distribution panels according to the present invention.

Abstract: The present invention provides a power supply system equipped with private power generation facilities suitable for use in general households and small-scale facilities and adapted to enable a reduction in power supply costs through easier operation.

Abstract: An electrical switching apparatus mounting apparatus includes a base with a planar portion having a first side and an opposite second side. A number of first adjustable members are coupled to the opposite second side. Each of the first adjustable members includes a first end and an opposite second end. A number of second adjustable members are coupled transverse to the first adjustable members and include a first end and an opposite second end. At least one of the first end and the opposite second end of at least one of the first adjustable members and the second adjustable members is adjustable generally toward or generally away from the base. At least one of the first end and the opposite second end of the at least one of the first adjustable members and the second adjustable members is coupled to a number of walls of a switchgear enclosure.

Abstract: An electrical distribution panel includes an enclosure, a first power input, a first circuit interrupter including a first terminal electrically connected to the first power input and a second terminal, a first bus electrically connected to the second terminal, a plurality of second circuit interrupters powered from the first bus, a second bus electrically connectable to the first bus through one of the second circuit interrupters, and a number of third circuit interrupters powered from the second bus. The first bus and a number of the second circuit interrupters power a number of first loads. The second bus and the number of third circuit interrupters power a number of different second loads. The electrical distribution panel is converted for operation with a second power input to power the second bus. The second power input receives power from at least one of a separately derived system, and a portable generator.

Abstract: The present invention relates generally to a load center. More particularly, the invention encompasses a generator ready load center (GRLC). The present invention is also directed to a novel generator ready load center (GRLC) that operates as a standard load center but is ready to accommodate an automatic transfer switch (ATS) for a standby generator, or a manual transfer switch (MTS) for a portable generator. Further the generator ready load center provides an automatic and manual transfer between primary and secondary power sources. The generator ready load center solves the problem of dangerous back-feeding between the primary power source and the secondary power source.

Abstract: A panelboard for fusible switching disconnect devices. The panelboard includes a chassis coupled to a mounting enclosure, The mounting enclosure can be used indoors or outdoors. The chassis is configured to receive one or more fusible switching disconnect devices. Each of the fusible switching disconnect devices includes both a fuse and a circuit breaker-like disconnect in a single, relatively compact housing. The compactness of the housing allows the panelboard to provide a higher level of overcurrent interruption in a smaller sized mounting enclosure than conventional panelboards. For example, the panelboard can have an interruption per volume rating of at least about 33 amps per cubic inch, as compared to about 2 amps per cubic inch for most conventional panelboards.

Abstract: A gas-insulated power apparatus comprising a vertically arranged gas-insulated circuit breaker included in a vertically arranged gas-insulated main tank, a first gas-insulated branch pipe connected to one side of an upper portion of the gas-insulated main tank substantially orthogonal to a direction of extending the gas-insulated main tank and leading out a feeder from a movable side of the gas-insulated circuit breaker, and a second and a third gas-insulated branch pipes which are respectively connected to both sides in a peripheral direction of a lower portion of the gas-insulated main tank substantially orthogonal to the direction of extending the gas-insulated main tank, one of which connects a fixed side of the gas-insulated circuit breaker to one gas-insulated Y bus of gas-insulated double buses and other of which connects the fixed side of the gas-insulated circuit breaker to other gas-insulated X bus of the gas-insulated double buses, respectively, by which a gas-insulated power apparatus having a str

Abstract: A power distribution panel having circuit elements such as KTK and GMT fuses removably mounted to a unit housing by means of module members, thereby allowing for ease of customization of the circuit elements of the power distribution panel.

Abstract: A current transformer cabinet is disclosed having an electrical meter coupled to current transformers. One or more disconnect switches arranged between the source conductors and the load conductors. The disconnect switches include a link member that allows the disconnecting of electrical service from the load conductors by rotation of the link from a first position to a second position.

Abstract: An operating switch wiring device capable of easily setting a load which is a group control object, without using a dedicated setter, and a handle member used therefore. The operating switch wiring device used for a remote supervisory control system includes a plurality of individual switches which are individually assigned with addresses corresponding to addresses of relays and individually turn on/off the relays, a group switch which groups one or plural of the individual switches into a group and collectively turns on/off the relays corresponding to the individual switches in the group, and group setting switches which are provided in correspondence with the individual switches and set whether each of the individual switches are registered in the group.

Abstract: There is disclosed an apparatus for controlling a vehicle equipment device. The apparatus permits a reduction in the cost of manufacturing a vehicle in which the apparatus is installed. The apparatus also enables easy and precise switching between normal mode and delivery mode. The apparatus has a delivery decision unit and control change unit. The decision unit makes a decision as to whether the vehicle is in the delivery mode. If the decision unit determines that the vehicle is in the delivery mode, the control change unit changes the controlled contents of the vehicle equipment device from normal mode to delivery mode. The decision unit makes the aforementioned decision according to whether a backup power supply is applied to a clock device.

Abstract: A power distribution device (100) is provided which is adapted for use at a junction point (103) between an electrical panel (121) and an electric outlet and/or switch (101) of a home. The device may include a switching circuit (104) adapted to regulate power flow between one or more junction point input lines and one or more junction point output lines, and a communication module (105) functionally associated with the switching circuit and adapted to receive power regulation instructions from a central, usually, remote; controller (106). There is also provided a power distribution controller adapted to communicate and provide power regulation instructions to one or more power distribution devices. A method is also provided for imparting smart-home capabilities to a non-smart home.

Abstract: An operating switch wiring device capable of easily setting a load which is a group control object, without using a dedicated setter, and a handle member used therefore. The operating switch wiring device used for a remote supervisory control system includes a plurality of individual switches which are individually assigned with addresses corresponding to addresses of relays and individually turn on/off the relays, a group switch which groups one or plural of the individual switches into a group and collectively turns on/off the relays corresponding to the individual switches in the group, and group setting switches which are provided in correspondence with the individual switches and set whether each of the individual switches are registered in the group.

Abstract: An electrical distribution panel includes first and second power inputs, a first circuit breaker electrically between the first power input and a first load bus, a second load bus, an automatic transfer switch having a first input electrically connected to the first load bus, a second input electrically connected to the second power input, and an output electrically connected to the second load bus. The transfer switch selectively electrically connects one of the first and second inputs to the output thereof. Pairs of circuit breakers each includes a second breaker having a first terminal electrically connected to the first load bus, and a second terminal, a third breaker including a first terminal electrically connected to the second load bus, and a second terminal, a power output electrically connected to the second terminals, and an interlock cooperating with the circuit breaker pair to prevent both of them from being closed simultaneously.

Abstract: The present invention provides a switch mounting mechanism that can be adopted with ease in conjunction with a compact fluid pressure device. A space (31), to be used to absorb elastic deformation of a holding arm (33) occurring as a switch holder (24) is inserted through a groove opening (22A) of a switch mounting groove (22), is formed. A clearance (32) to be used as a buffer for the holding arm (33) is formed between the switch mounting groove (22) and a detection switch (21). As a result, the switch holder (24) can be inserted to assume the same position as the detection switch (21) inside the switch mounting groove (22).