Multi-pole measuring adapter for mounting electrical equipment on a contact-protected busbar system, and corresponding contact protection arrangement

Abstract

The invention relates to a multi-pole measuring adapter (20) for mounting electrical equipment on a contact-protected busbar system (4), wherein the measuring adapter (20) has holding and / or contact feet (21) designed to reach through passage openings (6) in a contact protection housing (2) made of electrically insulating material of a contact-protected busbar system (4) and to tap off a supply voltage for electrical equipment that can be mounted on the measuring adapter (20), characterized in that the measuring adapter (20) has a measuring module (40) with a housing (41) accommodating at least one sensor (42) for the magnetic field-based current measurement, wherein the housing (41) has at least one passage channel (44) extending between opposite housing sides (43) and the at least one sensor (42) is arranged on the periphery of the passage channel (44) in the interior of the housing (41).

Description

[0001] Multi-pole measuring adapter for mounting an electrical device on a touch-protected busbar system and a corresponding touch protection arrangement

[0002] The invention relates to a multi-pole measuring adapter for mounting an electrical device on a touch-proof busbar system, wherein the measuring adapter has retaining and / or contact feet configured to extend through openings in a touch-proof housing made of electrically insulating material of a touch-proof busbar system and to tap a supply voltage for an electrical device mountable on the measuring adapter. A touch-proof busbar system with a multi-pole measuring adapter is known from EP 3 766 146 B1. Another touch-proof busbar system is also described in DE 10 2016 107 565 A1.

[0003] Such arrangements are used in switchgear and control system construction. For electrical switchgear and control systems, monitoring the power consumption of the electrical switchgear is desirable, especially in light of increasing efforts to save energy. A connection adapter for field-based current measurement is described in WO 2017 / 148826 A1. EP 3772796 B1 describes a busbar holder for fixing busbars in a low-voltage distribution board. It describes a current measuring device that detects the magnetic field generated by the busbars. The current measuring device is designed as a current transformer with a magnetic core and a transformer coil wound around it, the ends of the transformer coil being electrically connected to the measuring device.The busbar holder is designed in two parts and comprises a base part for mounting the busbar holder system in the control cabinet, with a receptacle for the busbar, and a cover part that can be attached to the base part. Furthermore, the magnetic core is also designed in two parts, comprising a lower part and an upper part, which are connected to each other when mounted. The lower part is wound with the transformer coil and is received and held in the base part of the busbar holder, while the upper part is received and held in the cover part of the busbar holder. EP 3187886 B1 relates to a connection adapter for a power busbar system with several parallel power busbars for supplying power to consumer units or loads via a switching device. The disclosed measuring module can perform field measurements to determine the current.In one embodiment, the current strengths of the current phases are measured using Rogowski coils contained in the measuring module, or using shunts, or using Hall sensors, or using current transformers.

[0004] The JP 0 625 6838 B2 describes a control cabinet with a busbar system integrated into the control cabinet, which provides shielding on the busbars to improve field-based current measurement.

[0005] WO 2021 / 013318 A1 describes a measuring adapter for contact current measurement.

[0006] EP2982994B1 describes a sensor and a method for current measurement in busbars, in which the correction of the influence of the interference of the magnetic fields of several energized busbars is provided.

[0007] EP 4068323 A1 describes a device for mounting on busbars, comprising a switching device and an electronic module. The switching device is specifically intended to be a fuse strip or load-disconnecting strip for low-voltage high-performance (NH) fuses. Further prior art is described in WO 2014 / 026702 A1 and WO 2021 / 122653 A1.

[0008] Secondary current transformers are frequently used today for current measurement in such arrangements. These current transformers must be integrated into the control systems and power distribution of the electrical switchgear. For this purpose, the current measuring sensor, such as a secondary current transformer, is mounted directly on the mounting plate on which the touch-proof busbar system is mounted, either above or below the electrical connections of the equipment. The connecting conductors are then individually routed through separate current transformers. For smaller currents and installations, split current transformers are often folded over the connecting conductors of the equipment and secured with cable ties. These then hang from the connecting cables and put a load on the cable terminals.

[0009] With exposed busbars, the current transformers are often pushed directly onto the flat copper rails and clamped to them with (plastic) support screws. This has the disadvantage that, in the event of a defect, the current transformers can only be replaced by shutting down and dismantling parts of the system.

[0010] Furthermore, current transformer blocks for snapping onto mounting rails and clip-on current transformers on circuit breakers for sub-distribution boards in building installations are known.

[0011] For all mounting configurations, the precise positioning and fastening of the current transformers must be planned, and the cable routing of the current transformer outputs must also be designed. Likewise, attention must be paid to the correct installation orientation of the current transformers. For example, the current direction through the current transformer is predetermined, and incorrect installation will lead to malfunctions or inaccurate measurements.

[0012] This happens during the planning and assembly of the plant, and sometimes also later during a retrofit, which is then particularly complex to implement.

[0013] The arrangements known from the prior art have the disadvantage of being complicated to handle and prone to installation and thus measurement errors. The object of the invention is therefore to enable reliable current measurement in touch-protected busbar systems using simple technical means.

[0014] This problem is solved by a measuring adapter with the features of claim 1. Dependent claim 17 relates to a corresponding contact protection arrangement. Advantageous embodiments are the subject of the dependent claims.

[0015] Accordingly, the measuring adapter is designed to include a measuring module with a housing containing at least one sensor for magnetic field-based current measurement. The housing has at least one through-channel extending between opposing housing sides, and the at least one sensor is arranged inside the housing at the circumference of the through-channel. Because the measuring module is an integral part of the measuring adapter and has at least one through-channel capable of guiding an electrical conductor, misuse of the measuring adapter is prevented. Preferably, the at least one sensor is arranged inside the housing at the circumference of the through-channel. The measuring module can be formed as a single unit with a base of the measuring adapter, from which the retaining and / or contact feet extend. Alternatively, the measuring module can be detachably mounted to the base via a mechanical interface.The base can be the housing of the measuring adapter. An electrical device can be mounted on the base, for example, using a DIN rail. The base can be configured to have an electrical output for each pole of the measuring adapter, or at least for one pole. The electrical device can be connected to at least one of the electrical outputs via a respective output conductor, for example, a cable, to supply it with power. The electrical outputs can be located on one of two opposite end faces of the measuring adapter. The measuring module can be located on the opposite end face. The at least one pass-through channel can have a direction of travel that extends between the opposite end faces of the measuring adapter.The measuring module can have one pass-through channel for each electrical pole of the measuring adapter, with at least one sensor for magnetic field-based current measurement arranged around the circumference of each pass-through channel inside the housing. The electrical device can have at least one output conductor, preferably at least one output conductor for each electrical pole of the measuring adapter. The at least one output conductor is routed through the at least one pass-through channel of the measuring module. If the electrical device has multiple output conductors, each output conductor is routed through a separate pass-through channel of the measuring module.

[0016] The passage channel can have a round or a non-round cross-section.

[0017] A round cross-section is preferred. However, it is also conceivable that the through-channel has a polygonal cross-section, for example, a rectangular, and in particular a square, cross-section. The at least one through-channel preferably extends parallel to a mounting side of the base of the measuring adapter, from which the retaining and / or contact feet extend. If the measuring module has several through-channels, these preferably extend parallel to each other. In the case of multiple through-channels, these are preferably arranged next to each other when projected onto the mounting side of the base of the measuring adapter.

[0018] The mechanical interface can be located on either of the two opposite housing sides between which the at least one through-channel extends. The mechanical interface can be a snap-fit ​​connection for tool-free mounting of the measuring module to the base. The mechanical interface, in particular the snap-fit ​​connection, preferably has a keying such that the measuring module can only be mounted to the base in exactly one relative orientation.

[0019] The measuring module can have a signal interface, preferably an electromechanical connector, preferably an RJ socket. The measuring module can be configured to forward a sensor signal acquired by the at least one sensor to an energy meter via the signal interface.

[0020] The measuring module can have at least one number of pass-through channels through the housing of the measuring module corresponding to the number of poles of the measuring adapter, wherein the number of pass-through channels is preferably identical to the number of poles of the measuring adapter.

[0021] The sensor can comprise at least one magnetic field coil, at least one Rogowski coil, at least one Hall sensor, at least one TMR sensor, or at least one GMR sensor, wherein the measuring module is preferably a secondary current transformer or a small-signal current transformer. Other sensors and even sensor technologies suitable for magnetic field-based current measurement may be considered.

[0022] The at least one sensor can be arranged on a circuit board housed within the enclosure, with the at least one pass-through channel extending through the circuit board. This allows for the most compact design possible of the measuring module and, moreover, enables the precise positioning of the at least one sensor relative to the pass-through channel using simple technical means. In particular, when multiple pass-through channels and, consequently, multiple sensors are arranged on the circuit board, the various sensors can be positioned in the same plane and precisely relative to one another using the circuit board.

[0023] A magnetic shield can be arranged on the circuit board to prevent interference fields. Particularly when the measuring module has multiple pass-through channels that may be located close to each other due to the compact design of the measuring adapter, the magnetic shield on the circuit board can be positioned between adjacent sensors, especially between sensors assigned to different pass-through channels. The measuring module can have several identical or different sensors, such as magnetic field sensors, arranged on a single circuit board. These multiple sensors can be arranged in a common plane. The multiple sensors can form a sensor array consisting of sensors regularly spaced in one, two, or three spatial dimensions.The sensor arrangement can have at least one assigned sensor, preferably at least one magnetic field sensor, for several of the pass-through channels, preferably for all pass-through channels. Several sensors can be provided for each pass-through channel, for example, a sensor array consisting of sensors arranged in a common plane and spaced regularly apart from one another. The at least one sensor, preferably a circuit board containing the at least one sensor or the at least one sensor array, can be adjustable relative to a housing of the measuring module, particularly in the axial direction of the at least one pass-through channel. This allows for adjustment of the position of the at least one sensor relative to the pass-through channel. This can also serve to reduce measurement errors caused by interference fields from a conductor passing through an adjacent pass-through channel.

[0024] The at least one sensor can be a magnetic field sensor for field-based current measurement, preferably a TMR sensor, an AMR sensor, a GMR sensor, or a Hall sensor. Additionally, the measuring module can include at least one temperature sensor, for example, an infrared sensor or a resistance temperature detector (RTD). The measuring module can include further sensors for recording relevant operating parameters of an electrical switchgear, for example, an air quality sensor or a humidity sensor. The measuring module can be configured to detect the concentration of a flammable gas, in particular a flammable refrigerant, for example, propane, in the ambient air of the multi-pole measuring adapter, which can be, for example, the air inside a switchgear enclosure.The measuring module can be configured to generate an error signal when a detected maximum deviation or a maximum value of a measured value is exceeded. The error signal can be provided via a data interface of the measuring module, for example, to a control system of an electrical switchgear assembly, of which the touch-proof busbar system on which the measuring adapter is mounted is a component.

[0025] The measuring module can have at least one interface for power supply and / or signal transmission. The interface can have at least one plug contact. The plug contact can be a socket or a plug of a connector. The plug contact can have at least one contact pin. The contact pin can be arranged on a printed circuit board on which the at least one sensor, preferably a sensor array, is arranged. The sensor can be configured to assume an active state when the measuring module is supplied with power via the at least one interface for power supply, and otherwise to assume a passive state, in particular a deactivated state. The measuring module can, in particular, not have its own power source. The measuring module can have an integrated circuit for evaluating at least one sensor signal from the at least one sensor.Alternatively, the sensor arrangement may not have such an integrated circuit and may be configured to transmit sensor signals unprocessed via a data interface, for example to a connection adapter that is mounted on the touch-protection housing and contacted with the measuring adapter for signal transmission.

[0026] The measuring module can be configured to process a sensor signal, in particular to evaluate it and / or to store a derived measured value in a digital memory and / or to display it on an optical output, for example, a display. In particular, if the measuring module is configured to receive an unprocessed or evaluated sensor signal via the interface, for example from another measuring adapter, the measuring module can be configured to process or evaluate the sensor signal. In one embodiment, the measuring adapter can have an integrated circuit. The measuring adapter can be a connection adapter.

[0027] The measuring adapter can have at least one optical display, preferably a screen, on which a measured value derived from a sensor signal of the at least one sensor, for example an electric current or a voltage drop, is displayed.

[0028] A plurality of sensors, preferably of the same type, for magnetic field-based current measurement can be arranged around the pass-through channel on the circuit board. The circuit board can have at least one opening through which the pass-through channel extends. The at least one sensor for magnetic field-based current measurement can be arranged around the opening. Preferably, several sensors for magnetic field-based current measurement, optionally of the same type, are arranged around the opening. Preferably, the circuit board has a plurality of openings, in particular a number of openings corresponding to the number of pass-through channels. At least one sensor for magnetic field-based current measurement can be arranged around the circumference of each of the openings. Preferably, several sensors for magnetic field-based current measurement, preferably of the same type, are arranged around the circumference of each of the openings.

[0029] The measuring module can therefore have a plurality of sensors for magnetic field-based current measurement, which are arranged in the same plane, preferably on a common circuit board.

[0030] The measuring module can have multiple passage channels, with at least one sensor arranged around the circumference of each passage channel inside the housing.

[0031] The measuring module can have a data storage device in which at least one specification of the measuring module is stored. Alternatively or additionally, the measuring module can have a readable unique identifier to which the at least one specification of the measuring module is linked. The identifier can be an optically readable code, for example, a QR code or a barcode.

[0032] The at least one specification may include a translation ratio and / or a parameterization for an energy meter with respect to the at least one sensor.

[0033] Manual configuration of the measurement module, such as entering a sensor / transducer conversion ratio, which may need to be done for each pole during installation, can thus be carried out in a fault-tolerant and automated manner.

[0034] For example, a sensor specification can be permanently assigned to the measuring adapter via an optically readable code printed on the measuring adapter's nameplate, such as a QR code, and made easily available to the user.

[0035] An energy meter can be programmed using an application that runs on a mobile device. For example, a QR code on the measuring module can be read via the application and the mobile device's camera. Sensor / transducer parameters can be determined from a data network via a wireless interface (Wi-Fi, Bluetooth, etc.) using the mobile device and transmitted to the energy meter, for example, as TCP / IP data packets. This allows for simple and error-free parameterization of the energy meter.

[0036] The measuring module can be configured solely for magnetic field-based acquisition of a sensor value representing electric current, such as a magnetic field strength or a derived voltage drop, or it can also be used to evaluate the sensor signals and output an electric current or a derived energy consumption. Output can be via a data interface, such as an RJ connector, or optically via a display. The display can be integrated into the measuring module's housing or into the base or housing of the measuring adapter. The measuring module can therefore be configured to determine an electric current from the measured voltage drop, taking into account the electrical resistance of a conductor passing through the pass-through channel.

[0037] The measuring module can have at least one temperature sensor configured to determine the temperature of at least one electrical conductor passing through the at least one passage channel, wherein the measuring module is either configured to output a temperature measurement signal via at least one signal interface of the measuring module, or to determine an electrical current taking into account a temperature-dependent specific electrical resistance of the electrical conductor and a voltage drop measured with the sensor.

[0038] A touch protection arrangement with a multi-pole measuring adapter of the type described above is further disclosed. The touch protection arrangement can include a touch protection housing made of electrically insulating material. The touch protection housing can have receptacles with busbars arranged therein, as well as a cover over the receptacles for mounting connection adapters, including measuring adapters. The cover can have at least one series of through-holes, preferably through-slots, for each receptacle, opening into the respective receptacle. The multi-pole measuring adapter can extend through one of the through-holes with its retaining and / or contact feet and electrically contact the busbars. The multi-pole measuring adapter can have one or more retaining and / or contact feet for each pole.The multi-pole measuring adapter can have a single retaining and contact foot for each pole, thus providing both a holding function and electrical contact. It can be provided that at least one pair of a retaining foot and a contact foot is provided for each pole. For example, a retaining foot can be configured to engage the busbars mounted in one of the receptacles. A contact foot, which can be a component separate from the retaining foot, at least functionally and also structurally, can have no holding function and be configured solely to establish an electrical contact with the busbar. DE10 2016 107 565 A1 describes a connection adapter that has a combined retaining and contact foot for each of the poles of a multi-pole connection adapter. The retaining and / or contact feet for the measuring adapter can be designed accordingly.Alternatively, the measuring adapter can have a combined holding and contact base for each pole. This can, for example, be designed using a Lyra contact that sits in a cutout in the busbar in a cross-connection, thus providing both a holding function and an electrical contact function.

[0039] Further details are explained with reference to the figures below. The embodiments shown in the figures have features that, individually or in any combination, can be suitable for realizing embodiments of the invention. In particular, the different embodiments shown in the figures can also be implemented in a single embodiment. The figures show:

[0040] Fig. 1 in perspective view shows an exemplary embodiment of a touch-protected busbar system according to the prior art in a partially exploded view;

[0041] Fig. 2 shows a schematic representation of a measuring adapter according to one embodiment; and

[0042] Figure 3 shows a perspective view of a partial view of a measuring adapter according to a further embodiment.

[0043] The touch-protected busbar system 1 shown in Figure 1, according to the prior art, has a modular design and essentially consists of two central modules 16, which are connected to each other via a snap-fit ​​connection 14 and terminated at opposite longitudinal ends by an end module 15. The end modules 15 and the two central modules 16 together form the touch-protection housing 2 of the touch-protection arrangement 1, which, in a manner known from the prior art, can be made, for example, of an electrically non-conductive plastic material. Three busbars 4 are mounted in the housing 2 in a touch-proof manner in receptacles 3 and are accessible from the front of the housing 2 via through-openings 6 for electrical devices and adapters. Corresponding device adapters and contact terminals are described, for example, in EP 3258558 B1. Alternatively, the housing 2 can be of a non-modular, i.e., one-piece, design.The cover 5 can be removable from the base 19 or permanently connected to it. The busbars 4 are received in receptacles 3 of the base 19. The cover 5 closes the receptacles 3 on the front of the touch guard 1, through which adapters and / or electrical components can be connected to the busbars 4. The base 19 forms a tray 9 which contains the receptacles 3. The tray 9 is completely covered and sealed by the cover 5.

[0044] The end modules 15 have an end cap 17 and a central module extension 18. All connections 14 are designed as identical snap-fit ​​connections, allowing for any combination, particularly between the central modules 16 and the central module extensions 18. For example, to adapt the touch-protected busbar system 1 shown to a given horizontal mounting plate width, the central module extensions 18 can be removed and the end caps 17 snapped directly onto the central modules 16. It is also possible to connect one or more additional central modules 16 between the two central modules 16 shown.

[0045] The busbars 4 housed in the touch-protection enclosure 2 are designed as flat busbars with two pairs of parallel outer faces that form a rectangular cross-section perpendicular to the longitudinal direction of the busbar 4. The cross-section is constant over the entire length of the busbar 4. Such busbars 4 can be manufactured cost-effectively by extrusion.

[0046] Figure 2 shows an exemplary embodiment of a measuring adapter 20 according to the invention. The measuring adapter 20 has an adapter housing or base 22, which is designed to be mounted on a touch-protection housing. For this purpose, the base 22 has a retaining and contact foot 21 on its side facing the touch-protection housing for each busbar, i.e., for each pole of the busbar system to be contacted. In the present embodiment, the retaining and contact feet are designed in two parts, with a hook-shaped element designed to engage behind the busbar received in the touch-protection housing. A contact element associated with the respective hook element serves for the electrical contacting of the respective current busbar.The measuring adapter 20 can reach through the through slots in the cover of the touch protection housing with its holding and contact feet, as described by way of example with reference to Figure 1.

[0047] The measuring adapter also functions as a connection adapter and thus serves for mounting and electrically connecting an electrical device 100 to the busbar system. The electrical device 100 is mounted on one mounting side of the base 22, in this case using a DIN rail. The three poles are electrically connected to each of the three poles via electrical conductors running within the base 22, each with an electrical output 103 on the top of the measuring adapter 20. The electrical output can be configured as a terminal block. A connecting cable 101 is provided for each pole, in this case for each of the three poles, which is connected on one side to a corresponding pole of the electrical output 103 and on the other side to the electrical device 100.The electrical equipment can be, for example, an electrical fuse, a transformer, an electrical switch, or other passive or active electrical equipment.

[0048] The electrical device 100 has at least one output line 102, which is guided through a through-channel 44 and a measuring module 40 of the measuring adapter 20. The measuring module 40 is detachably connected to the base 22 via a mechanical interface 45. The measuring module 40, in particular a housing 41 of the measuring module 40, can be connected to the base via a mechanical interface. Alternatively, the measuring module 40, in particular the housing 41 of the measuring module 40, can be formed as a single unit with the base.

[0049] The at least one through-channel 44, in this case all three through-channels 44, extend between opposite housing sides 43 of the measuring module 40. In particular, the through-channel 44 extends perpendicular to the two opposite, parallel housing sides 43. The housing sides 43 can be arranged parallel to the end faces of the base 22. This allows the output leads 102 of the electrical device 100 to be easily routed from the electrical device 100, particularly without significant changes in direction, and also from the touch-protection housing on which the measuring adapter 20 is mounted, thus preventing a collision of the output leads 102 with other electrical components that may be mounted on the touch-protection housing. The operating component 100 can be connected to an energy meter 47 via the output lead 102.The pass-through channel 44 is accompanied inside the housing 41 by at least one sensor 42 for magnetic field-based current measurement. The sensor 42 can be located directly adjacent to a wall of the housing 41 that defines the channel 44. The sensor 42 can be exposed to the pass-through channel 44 via an opening in the wall. The sensor can be a coil encircling the respective pass-through channel, for example, a Rogowski coil. Alternatively, the sensor can be a Hall sensor, a GMR sensor, a TMR sensor, or a combination of these sensors.

[0050] The measuring module 40 has an optically readable identifier 48 on an outer surface of the housing 41 for the configuration of an energy meter 47. The identifier 48 can be read, for example, via the camera system of a mobile device 50. The mobile device 50 can access a network 49 via a radio interface and retrieve a configuration or parameterization of the measuring module 40, in particular of the at least one sensor 42 incorporated therein, identified by the identifier. The parameterization can be output to the energy meter 47, preferably also via the network 47. The measuring module 40 has a signal interface 46. The measuring module 40 is connected to the energy meter 47 via a signal line 104 connected to this interface.The measurement signal acquired by the measurement module 40, in particular a magnetic field strength or a derived electrical voltage drop, can be transmitted to the energy meter via the signal interface and the signal line 104. Based on the parameterization provided via the network 47, the energy meter 47 can perform a precise energy measurement.

[0051] Figure 3 shows an exemplary embodiment of a measuring module 40, which is attached to the base 22 at one end face of the base 22 of the measuring adapter 20. A mechanical interface 45 is formed between the base 22 and the housing 41 of the measuring module 40. The measuring module 40 can thus be selectively mounted to the base 22 to give the base additional functionality or to give a connection adapter an additional measuring function, i.e., to turn the connection adapter into a measuring adapter. The mechanical interface 45 has a code to ensure that the measuring module 40 can only be fixed to the base 22 in a defined mounting position relative to the base 22. Through-pass channels 44 run between opposite housing sides 43, which extend parallel to the end faces of the base 22, with one through-pass channel being provided for each pole of the measuring adapter 20.According to the arrangement of the poles of the measuring adapter 20, the pass-through channels 44 are arranged in a staggered manner, which simplifies cable management and further reduces errors in the assignment of the output lines 102 to the pass-through channels 44.

[0052] The features disclosed in the foregoing description and in the figures can be relevant individually or in any combination for the realization of embodiments of the invention, the scope of protection being defined by the claims. List of reference numerals:

[0053] Touch-protected busbar system, touch-protected housing

[0054] Recordings

[0055] busbar

[0056] cover

[0057] Passage opening

[0058] shielding

[0059] Interruption

[0060] bathtub

[0061] Magnetic field sensor

[0062] circuit board

[0063] guide

[0064] integrated circuit

[0065] Locking connection

[0066] End module

[0067] Central module

[0068] End cap

[0069] Central module extension

[0070] lower part

[0071] Measuring adapter

[0072] 1 Holding and / or contact foot

[0073] Housing / Base

[0074] Measurement module

[0075] 1 case

[0076] sensor

[0077] Case side

[0078] passage channel

[0079] mechanical interface

[0080] Signal interface

[0081] Energy meter

[0082] identifier

[0083] network

[0084] Mobile device

[0085] 0 electrical equipment

[0086] 1 connection cable

[0087] 2 Output line 103 Electrical output 104 Signal line

Claims

Claims:

1. Multi-pole measuring adapter (20) for mounting an electrical device on a touch-proof busbar system (4), wherein the measuring adapter (20) has retaining and / or contact feet (21) which are configured to reach through passage openings (6) of a touch-proof housing (2) made of electrically insulating material of a touch-proof busbar system (4) and to tap a supply voltage for an electrical device mountable on the measuring adapter (20), characterized in that the measuring adapter (20) has a measuring module (40) with a housing (41) in which at least one sensor (42) for magnetic field-based current measurement is accommodated, wherein the housing (41) has at least one passage channel (44) extending between opposite housing sides (43) and the at least one sensor (42) is arranged on the circumference of the passage channel (44).

2. Multipole measuring adapter (20) according to claim 1, in which the measuring module (40) is formed in one part with a base (22) of the measuring adapter (20) from which the retaining and / or contact feet (21) extend, or is detachably mounted on the base (22) via a mechanical interface (45).

3. Multipole measuring adapter (20) according to claim 2, wherein the mechanical interface (45) is formed on one of the two opposite housing sides (43) between which the at least one through-channel (44) extends.

4. Multipole measuring adapter (20) according to claim 2 or 3, wherein the mechanical interface (45) is a snap-fit ​​connection for tool-free mounting of the measuring module (40) on the base (22), wherein the mechanical interface (45), in particular the snap-fit ​​connection, preferably has a coding such that the measuring module (40) can only be mounted on the base (22) in exactly one relative orientation with respect to the base (22).

5. Multipole measuring adapter (20) according to one of the preceding claims, wherein the measuring module (40) has a signal interface (46), preferably an electromechanical connector, particularly preferably an RJ socket.

6. Multipole measuring adapter (20) according to claim 5, wherein the measuring module (40) is configured to forward a sensor signal detected by the at least one sensor (42) to an energy measuring device (47) via the signal interface (46).

7. Multipole measuring adapter (20) according to one of the preceding claims, wherein the measuring module (40) has at least one number of pass-through channels (44) through the housing (41) of the measuring module (40) corresponding to the number of poles of the measuring adapter (20), wherein the number of pass-through channels (44) is preferably identical to the number of poles of the measuring adapter (20).

8. Multipole measuring adapter (20) according to one of the preceding claims, wherein the sensor (42) comprises at least one magnetic field coil, at least one Rogowski coil, at least one Hall sensor, at least one TMR sensor or at least one GMR sensor, wherein the measuring module (40) is preferably a secondary current transformer or small-signal current transformer.

9. Multipole measuring adapter (20) according to one of the preceding claims, wherein the at least one sensor (42) is arranged on a circuit board (11) received in the housing (41), wherein the at least one pass-through channel (44) extends through the circuit board (11).

10. Multipole measuring adapter (20) according to claim 9, in which a plurality of sensors (42), preferably of the same type, for magnetic field-based current measurement are arranged on the circuit board (11) around the pass-through channel (44).

11. Multipole measuring adapter (20) according to one of the preceding claims, wherein the measuring module (40) has a plurality of sensors (42) for magnetic field-based current measurement, which are arranged in the same plane, preferably on a common circuit board (11).

12. Multipole measuring adapter (20) according to claim 11, in which the measuring module (40) has a plurality of pass-through channels (44), wherein at least one of the sensors (42) is arranged on the circumference of each of the pass-through channels (44) inside the housing (41).

13. Multipole measuring adapter (20) according to any of the preceding claims, in which the measuring module (40) has a digital memory (27) in which at least one specification of the measuring module (40) is stored, or has a readable unique identifier (48) by which at least one specification of the measuring module (40) is linked.

14. Multipole measuring adapter (20) according to claim 13, wherein the at least one specification comprises a translation ratio and / or a parameterization for an energy measuring device with respect to the at least one sensor (42).

15. Multipole measuring adapter (20) according to one of the preceding claims, wherein the measuring module (40) is configured to determine an electric current from the measured voltage drop, taking into account an electrical resistance of an electrical conductor passed through the pass-through channel (44).

16. Multipole measuring adapter (20) according to one of the preceding claims, wherein the measuring module (40) has at least one temperature sensor (42) which is configured to determine a temperature of at least one electrical conductor passed through the at least one pass-through channel (44), wherein the measuring module (40) is either configured to output a temperature measurement signal via at least one signal interface of the measuring module (40) or to determine an electrical current taking into account a temperature-dependent specific electrical resistance of the electrical conductor and a voltage drop measured with the sensor (42).

17. Touch protection arrangement with a multi-pole measuring adapter (20) according to one of the preceding claims and with a touch protection housing (2) made of electrically insulating material, wherein the touch protection housing (2) has receptacles (3) with busbars (4) arranged therein and a cover covering the receptacles (3) for mounting connection adapters, including measuring adapters (20), wherein the cover has at least one series of passage openings (6) for each receptacle, which open into the respective receptacle, and wherein the multi-pole measuring adapter (20) extends through each of the passage openings (6) with its retaining and / or contact feet (21) and electrically contacts the busbars (4).

Images