System and method for calibrating a tripping mechanism of a circuit breaker

Abstract

A system for use as part of a circuit breaker comprises a carrier 104 having a threaded aperture 106, a bi-metal strip 102 attached to the carrier, and a threaded member 108 which engages with the thr

Description

Field This relates to a system for use as part of a circuit breaker, such as a circuit breaker. In particular, the system can be used for calibrating a tripping mechanism of a circuit breaker. Background Circuit breakers, such as miniature circuit breakers, include a tripping mechanism which opens the circuit. However, circuit breakers require calibration of the tripping mechanism after manufacture and before sale to a consumer to ensure the circuit breaker operates reliably, consistently, and provides the required protection. Existing designs for actuating a tripping mechanism include a bi-metal strip which is held in place by a carrier and aligned by way of a screw and an opposing spring. The screw moves the carrier along a lateral direction and the spring opposes the movement, allowing the carrier and bimetal strip to be appropriately positioned during calibration. The bi-metal strip actuates a mechanical latch of the tripping mechanism (i.e. acts as an actuator in the event of a fault). However, this design requires a complex and time-consuming assembly process. The complex assembly process also has a greater potential for assembly errors, which can result in an inconsistent and unreliable tripping mechanism. Alternative designs for actuating a tripping mechanism use the carrier itself as a spring. However, the carrier has limited elasticity and sensitivity, and so calibration of the tripping mechanism may be less accurate. This reduction in accuracy can result in a circuit breaker that may fail to trip in overload situations, which poses a serious safety risk, or which trips erroneously. It would be desirable to provide a tripping mechanism for a circuit breaker that can be more easily and accurately calibrated, and which has an efficient manufacturing process. Summary Described herein is a system for use as part of a circuit breaker, optionally, a miniature circuit breaker, which can be used to actuate a tripping mechanism of the circuit breaker. An alternative system for use as part of a circuit breaker is described herein. A method for calibrating the circuit breaker using the system is also described herein. A system for use as part of a circuit breaker, as described herein, comprises a carrier. The carrier comprises a threaded aperture. The system further comprises a bi-metal strip attached to (or coupled to) the carrier, and a threaded member which is configured to engage with the threaded aperture. The threaded member is configured to be rotated, wherein rotation of the threaded member is configured to adjust a position of the carrier. Previous systems for adjusting the carrier and / or bi-metal strip required both a spring and screw. Advantageously, the system described herein does not require a spring, and therefore requires fewer components for manufacturing. The manufacturing process is therefore simpler and quicker than for previous designs, with fewer points of failure. A more robust and reliable circuit breaker may therefore be provided. Previous systems also required either the plastic housing of the circuit breaker to have a thread for use with the screw, or an additional threaded part (such as a nut) to be held within the housing. Such plastic threading is weak and can be easily broken. The system described herein does not require plastic thread in the housing of the circuit breaker, since the threaded member engages directly with the carrier itself, and therefore is more durable. This can allow for a reduced risk of failure, and consequently provide greater safety and increase the operational lifetime of the circuit breaker. In some implementations, adjustment of the position of the carrier is configured to adjust a position of the bi-metal strip. In some implementations, adjustment of the position of the carrier is configured move the bi-metal strip. In other words, rotation of the threaded member can adjust / move the bi-metal strip via the carrier, thereby facilitating calibration of the system. Advantageously, the system described herein may provide greater precision in adjusting the position of the during a calibration phase as compared to previous systems. The movement of the bi-metal strip may therefore be more precisely controlled, and so allow a tripping mechanism of the circuit breaker to be calibrated more accurately. The protection from electrical faults may be improved and the prevalence of erroneous tripping may be reduced, and so providing a more reliable, consistent, and robust circuit breaker. In some implementations, the threaded member is fixed in a lateral direction. The threaded member may rotate around an axis of rotation which is parallel to, or coincident with, the lateral direction. Due to tolerances in a housing of the circuit breaker, the threaded member may be able to move a small amount, but is unable to substantially move in the lateral direction, or in directions perpendicular to it. For example, due to the tolerances in the housing the threaded member may be able to slightly change angle around the axis of rotation of the threaded member within the housing. In some implementations, the rotation of the threaded member is configured to move the carrier in the lateral direction, or adjust the position of the carrier in the lateral direction. In some implementations, a range of movement of the carrier in the lateral direction is between 1 mm and 15 mm, optionally between 5 mm and 10 mm, optionally between 6 mm and 9 mm, optionally between 7 mm and 9 mm, optionally 8 mm. However, it will be understood that the range of movement is dependent on the design of the carrier, threaded member and bi-metal strip, and can be any suitable value as required by the application and configuration of the system. Advantageously, the bi-directional movement of the carrier in the lateral direction may contribute further control over the alignment of the carrier. The greater control improves the accuracy of calibration of the tripping mechanism during a calibrating phase and therefore can improve the protection provided against electrical faults when the circuit breaker is in use. Advantageously, allowing the tripping mechanism to be calibrated more accurately during a calibration phase during manufacture can reduce the frequency of maintenance and the need for recalibration of the circuit breaker. Additionally, this may prolong the lifetime of the circuit breaker. In some implementations, the threaded aperture is at a first end of the carrier. In some implementations, the first end of the carrier is free and not fixed to a housing of the circuit breaker. In some implementations, a portion of the carrier (other than the first end) is fixed to a housing of the circuit breaker. The rotation of the threaded member is configured to move the first end of the carrier and so deform or bend the carrier. Advantageously, the threaded member and the engaged threaded aperture of the system described herein may prevent displacement and misalignment of the carrier due to e.g. mechanical shocks or vibrations. This can allow for a more secure alignment of the carrier, and therefore reduce the need for frequent maintenance and so provide a more robust circuit breaker. In some implementations, the bi-metal strip is configured to actuate a mechanical latch of a tripping mechanism of the circuit breaker. Advantageously, the system described herein can be easily implemented in existing designs of circuit breakers without substantial modifications, and so may be more easily retrofit. In some implementations, the bi-metal strip is rigidly coupled to the carrier. Optionally, the bi-metal strip is welded to the carrier. Optionally, the bi-metal strip is rigidly coupled to the carrier by: a rivet and / or a bolt and / or any other suitable fastening or attachment means. In some implementations, the threaded member is contained within a housing of the circuit breaker. Advantageously, the system described herein can use a larger surface area of the housing of the circuit breaker to hold the threaded member. In particular, the head of the bolt can contact the housing across the whole or most of its surface area (in contrast to previous arrangements where only the thread is embedding into the housing). This may allow heat generated within the circuit breaker to be more easily spread and dissipated, as well as more evenly distribute mechanical stress. This can increase the durability and operational lifespan of the circuit breaker. Moreover, these advantages can be achieved in a simpler and more efficient manner than previous arrangements which used a nut retained within the housing to extend the surface area of contact with the housing. In some implementations, the system further comprises an aperture in the housing of the circuit breaker and a blocking element. The aperture is configured to provide access to the threaded member. The aperture is also configured to be covered by the blocking element. Advantageously, the aperture provides better accessibility to the threaded member during manufacture and during a calibration phase, which may provide easier assembly of the circuit breaker. Additionally, the blocking element may prevent external access to the electrical circuitry after the circuit breaker is calibrated. The blocking element therefore may further contribute to the safety of the circuit breaker when installed and in use by preventing adjustment by a consumer or other unauthorised user. In some implementations the threaded member is a screw or a bolt. In some implementations, the carrier is made of metal. In some implementations, a housing of the circuit breaker is made of a non-conducting material (e.g., plastic). In some examples, a flexible cable or wire is electrically coupled to the bi-metal strip. By using a cable to provide electrical connection, the bi-metal strip can be moved more easily, because the cable is flexible and does not exert any (or a very low, insignificant) force onto the bi-metal strip or carrier. The cable or wire should not be under any tension, to avoid exerting force on the bi-metal strip or carrier, which force may interfere with the calibration. Also described herein is a method for calibrating a tripping mechanism of a circuit breaker using the system described herein. The method comprises rotating a threaded member. The threaded member is configured to engage with a threaded aperture of a carrier. The method further comprises, in response to rotating the threaded member, causing an adjustment in a position of the carrier in a lateral direction (i.e. causing movement of the carrier in the lateral direction). The method also comprises, in response to causing an adjustment in the position of the carrier, causing an adjustment in a position of a bi-metal strip. The bi-metal strip is attached to the carrier. Advantageously, the method of calibrating the circuit breaker described herein may provide a greater degree of precision in adjusting the position of the carrier, as compared to previous systems. Moving the position of the bi-metal strip may therefore be more precisely controlled, and so allow for more accurate calibration of a tripping mechanism of the circuit breaker. The increased accuracy may improve the protection from electric faults and reduce the frequency of erroneous tripping, which may provide a more reliable, consistent, and robust circuit breaker. Advantageously, the method described herein may allow a tripping mechanism to be calibrated more accurately during manufacture. This can reduce the frequency of maintenance and the need for recalibration of the circuit breaker, which may prolong the lifetime of the circuit breaker. Additionally, the bi-directional movement of the carrier in the lateral direction may contribute further control over the alignment of the carrier. The method of calibration may therefore have improved accuracy for the tripping mechanism of the circuit breaker. The improved accuracy may ensure greater protection against electrical faults when the circuit breaker is installed and in use, and so provide a greater degree of safety. List of Figures The detailed description is made with reference to the following Figures. Fig. 1A is a schematic illustration of an example system for use as part of a circuit breaker. Fig. IB is a schematic illustration of rotation of a threaded member of the example system, such as the example system depicted in Fig. 1A. Fig. IC is a schematic illustration of an example system in which a bi-metal strip actuates a mechanical latch of a tripping mechanism of the circuit breaker. Fig. 2 is an illustration of an example system for use as part of a circuit breaker. Fig. 3 is an example method for operating the system for use as part of a circuit breaker, such as those illustrated in Figs. 1A, IB, IC, and Fig. 2 to calibrate the circuit breaker. Detailed description With reference to Figs. 1A, IB, and IC, a schematic illustration of an example system for use as part of a circuit breaker is described. The circuit breaker is optionally a low voltage circuit breaker, for example for residential or domestic applications, such as a miniature circuit breaker, MCB. However, the principles described herein are applicable to any type of circuit breaker, including but not limited to an RCD, R.CCB, RCBO, or any other suitable circuit breaker. Fig. 1A shows a schematic illustration of an example system for use as part of a circuit breaker 140. The system comprises a carrier 104, which comprises a threaded aperture 106 (for clarity, the threaded component of the aperture 106 is not shown). The system further comprises a bi-metal strip 102 which is attached to the carrier 104. The system also comprises a threaded member 108 which is configured to engage with the threaded aperture 106. The threaded member 108 is configured to be rotated around an axis of rotation (116, see Fig. IB). The rotation of the threaded member 108 is configured to adjust a position of the carrier 104. The threaded member is retained within the circuit breaker such that rotation of the threaded member 108 is configured to adjust a position of the carrier 104. For simplicity, engagement of the threaded member 108 with the circuit breaker is not shown, but it will be understood that the threaded member may be a screw or a bolt, for example, and that a head of the threaded member may engage with the circuit breaker to retain the threaded member. In some examples, adjusting the position of the carrier 104 is configured to adjust a position of the bi-metal strip 102. In some examples, adjusting the position of the carrier 104 is configured move the bi-metal strip 102. In some examples, the bi-metal strip 102 is rigidly coupled to the carrier 104. In some examples, the bi-metal 102 strip is welded to the carrier 104, or optionally, the bimetal strip 102 is rigidly coupled to the carrier 104 by a rivet or a bolt. In some examples, the threaded aperture 106 goes only part of the way through the carrier 104 (i.e. may form a recess or opening in the carrier). In other examples, the threaded aperture 106 extends completely through the carrier 104 (i.e. comprises a through-hole). In some examples, the system further comprises an aperture, window or opening 112 in a housing 110 of the circuit breaker 140 and a blocking element (not depicted in Fig. 1A). The aperture 112 is configured to provide access to the threaded member 108. The aperture 112 is also configured to be covered by the blocking element. Advantageously, the blocking element may improve the safety of the circuit breaker 140 when in use, by preventing external access to the circuitry of the circuit breaker 140 and so preventing adjustment by an unauthorised user. Additionally, the aperture 112 can provide improved accessibility to the threaded member 108 during a calibration phase of the manufacture of the circuit breaker, which may reduce the assembly time of the circuit breaker 140. In some examples, the carrier 104 is made of metal. In some examples, a housing 110 of the circuit breaker 140 is made of a material which is an electrical insulator, such as plastic. Any suitable materials may be used. In previous systems, the plastic housing of the circuit breaker was constructed with a thread for use with a screw. However, since the plastic threading was relatively weak and subject to mechanical forces, it could easily breaker. The system described herein does not require a plastic thread in the housing of the circuit breaker 140. A more durable and robust circuit breaker is provided, which has a reduced risk of failure, longer useable lifetime, and improved safety. In some examples, the threaded aperture 106 is at a first end of the carrier 104. In some examples, the first end of the carrier 104 is not fixed to a housing 110 of the circuit breaker 140, and so is free. In some examples, the rotation of the threaded member 108 is configured to bend the first end of the carrier 104. With reference to Fig. IB, a schematic illustration of rotation of a threaded member of the example system, such as the example system depicted in Fig. 1A, is illustrated. In some examples, the rotation (e.g., as depicted in Fig. IB) of the threaded member 108 around the axis 116 is configured to move the carrier 104 in a lateral direction 114 (where the lateral direction is parallel to, optionally coincident with, the axis 116). In some examples, a range of movement of the carrier 104 in the lateral direction 114 is between 1 mm and 15 mm, optionally between 5 mm and 10 mm, optionally between 6 mm and 9 mm, optionally between 7 mm and 9 mm, optionally 8 mm. However, it will be understood that the range of movement is dependent on the design of the carrier, threaded member and bi-metal strip, and can be any suitable value as required by the application and configuration of the system. Previous systems for adjusting the carrier and / or bi-metal strip required both a spring and screw. Advantageously, the system described herein does not require a spring, and therefore requires fewer components for manufacturing. The manufacturing process is therefore simpler and quicker than for previous designs, with fewer points of failure. A more robust and reliable circuit breaker may therefore be provided. Additionally, the bi-directional movement of the carrier 104 in the lateral direction 114 may contribute to further increasing the accuracy in adjusting the position of the carrier during a calibration phase. The circuit breaker 140 when installed and in use may therefore have improved protection against electrical faults, and so contribute to increased safety. In some examples, the threaded member 108 is contained or retained within a housing 110 of the circuit breaker 140 such that rotation of the threaded member causes adjustment of the carrier 104. In some examples, the threaded member 108 is fixed in the lateral direction 114. However, it may be the case that a housing 110 of the circuit breaker 140 has tolerances such that the threaded member 108 is able to move by a small amount. For instance, the tolerances may be such that the threaded member 108 is fixed in a lateral direction 114 (and optionally in directions perpendicular to the lateral direction) but the threaded member 108 may be able to slightly change angle with respect to its axis of rotation 116 within the housing 110. With reference to Fig. IC, a schematic illustration of the example system is depicted. In some examples, such as in the illustration depicted in Fig. IC, the bi-metal strip 102 is configured to actuate a mechanical latch 150 of a tripping mechanism of the circuit breaker 140. In Fig. IC, reference numerals shared with Fig. 1A and Fig. IB denote the same features. As illustrated in Fig. IC, the bi-metal strip 102 is in an actuation configuration, different to a configuration of the bi-metal strip 102 depicted in Fig. 1A. The actuation state is reached when the bi-metal strip deforms or bends due to temperature increase within the circuit breaker. The bending of the bi-metal strip 102 in the actuation configuration of Fig. IC is configured to actuate the mechanical latch 150 of the tripping mechanism of the circuit breaker 140. By calibrating the position of the bi-metal strip, the bi-metal strip can reach the correct position for actuating the latch 150 once bent. Previous systems for adjusting the carrier and / or bi-metal strip, and so calibrating the actuation of a tripping mechanism of a circuit breaker, required both a spring and screw. The system described herein does not require the spring. Advantageously, there are fewer components required to manufacture the system, and so the manufacturing process may be quicker and more straight-forward than for previous systems. Moreover, a more reliable circuit breaker may be provided, which has fewer points of failure and may require less frequent maintenance. Advantageously, the system described with reference to Figs. 1A, IB, and IC can be easily implemented in existing designs of circuit breakers without substantial modifications, and so may be more easily retrofit. With reference to Fig. 2, an example system for use as part of a circuit breaker is described. The circuit breaker is optionally a low voltage circuit breaker, for example for residential or domestic applications, such as a miniature circuit breaker, MCB. However, the principles described herein are applicable to any type of circuit breaker, including but not limited to an RCD, RCCB, RCBO, or any other suitable circuit breaker. The system of Fig. 2 can be a specific example of the system described above with reference to Fig. 1A. The system illustrated in Fig. 2 comprises a carrier 204, which comprises a threaded aperture 206. The system further comprises a bi-metal strip 202 which is attached to or coupled to the carrier 204. The system also comprises a threaded member 208 which is configured to engage with the threaded aperture 206. The threaded member is configured to be rotated. The rotation of the threaded member 208 is configured to adjust a position of the carrier 204. In some examples, such as those illustrated in Fig. 2 (and Figs. 1A, IC), the threaded aperture 206 is at a first end of the carrier 204. In some examples, the first end of the carrier 204 is free and not fixed to a housing 210 of the circuit breaker 240. In some examples, another portion of the carrier 204 is fixed to a housing 210 of the circuit breaker 240. The rotation of the threaded member 208 is configured to deform the first end of the carrier 204 and so bend the carrier 204; this deformation is caused by the interplay in the fixed portion of the carrier, the movement of the free end of the carrier, and the engagement between the threaded aperture and the threaded member. Advantageously, the threaded member 208 and the engaged threaded aperture 206 may prevent misalignment and / or displacement of the carrier 204 (and therefore of the bi-metal 202), which misalignment or displacement may be due to vibrations and / or mechanical shocks, for example. By reducing the risk of misalignment and / or displacement, and so ensuring a more secure alignment of the carrier 204 and so bimetal 202, a more durable and robust circuit breaker may be provided. In some examples, adjusting the position of the carrier 204 is configured to move the bi-metal strip 202. In some examples, rotating the threaded member 208 is configured to move the carrier 204 in a lateral direction 214. In some examples, a range of movement of the carrier 204 in the lateral direction 214 is between 1 mm and 15 mm, optionally between 5 mm and 10 mm, optionally between 6 mm and 9 mm, optionally between 7 mm and 9 mm, optionally 8 mm. However, it will be understood that the range of movement is dependent on the design of the carrier, threaded member and bi-metal strip, and can be any suitable value as required by the application and configuration of the system. In some examples, as depicted in Fig. 2, the threaded aperture 206 extends through the whole carrier 204 (as a through-hole). In other examples, the threaded aperture 206 extends only part of the way through the carrier 204 (e.g. is formed within a recess in the carrier). In some examples, the bi-metal strip 202 is rigidly coupled to the carrier 204. Optionally, the bi-metal strip 202 is welded to the carrier 204. In some examples (not depicted in Fig. 2), the bi-metal strip 202 is rigidly coupled to the carrier 204 by a rivet and / or a bolt. In some examples, the system further comprises an aperture 212 in the housing 210 of the circuit breaker and a blocking element (not shown in Fig. 2). The aperture 212 is configured to provide access to the threaded member 208. The aperture 212 is also configured to be covered by the blocking element, which may be put in place following a calibration phase of the manufacturing process. Advantageously, the blocking element may prevent unauthorised access to the internal circuity of the circuit after manufacturing and when installed and in use, and so contributing to improve overall safety for users of the circuit breaker. In some examples, the bi-metal strip 202 is configured to actuate a mechanical latch (not depicted in Fig. 2) of a tripping mechanism of the circuit breaker. In some examples, the threaded member 208 is fixed in a lateral direction 214. In some examples, the threaded member 208 is contained within a housing 210 of the circuit breaker; for example, the threaded member can be seen contained within a hole or opening 218 of the housing 210. Nonetheless, there may be some tolerances in the construction of the housing 210 and hole 218, and so the threaded member 208 may be able to move slightly within the hole 218. For example, the threaded member 208 may be able to slightly change angle about the axis of rotation 116 (shown in Fig. IB) of the threaded member 208. Advantageously, the bi-directional movement of the carrier 204 in the lateral direction 214 which is facilitated by the rotation of the threaded member clockwise and anticlockwise around the axis of rotation may also contribute to greater accuracy in adjusting the position of the carrier 204. Additionally, the threaded member 208 which is fixed in the lateral direction 214 may be prevented from accidental displacement, and so the position of the carrier 204 may be securely maintained by way of the engagement to said threaded member 208. The circuit breaker may therefore provide greater protection from electrical faults, and require less frequent re-calibration, contributing to a safer circuit breaker with a longer operational lifetime. With reference to Fig. 3, a method 300 for calibrating a circuit breaker 140 by using the system described herein is described. The method 300 comprises rotating 302 a threaded member 108, 208. The threaded member 108, 208 is configured to engage with a threaded aperture 106, 206 of a carrier 104, 204. The method further comprises, in response to rotating 304 the threaded member 108, 208, causing an adjustment in a position of the carrier 104, 204, in which the carrier 104, 204 moves in a lateral direction 114, 214. The method also comprises, in response to causing 306 an adjustment in the position of the carrier 104, 204, causing an adjustment in a position of a bi-metal strip 102, 202. The bi-metal strip 102, 202 is attached to the carrier 104, 204. Advantageously, the method 300 described herein may allow a tripping mechanism to be calibrated more accurately during manufacture, with a greater degree of precision when adjusting the position of the carrier 104, 204 and bi-metal strip 102, 202. As a result, the lifetime of the circuit breaker may be prolonged and the frequency with which maintenance is required may also be reduced. The method 300 may therefore provide a more consistent and reliable circuit breaker, with improved protection from electric faults and reduced rate of erroneous tripping. The method 300 described herein may reduce the frequency of maintenance and the need for recalibration of the circuit breaker, by improving the accuracy of calibration of a tipping mechanism during manufacture. This reduction may prolong the lifetime of the circuit breaker. In some examples described herein, without reference to Figures, a cable or wire is electrically coupled to the bi-metal strip. As electricity passes through the bi-metal strip, the bi-metal strip heats up and then bends, thereby triggering actuation of the latch 150. Optionally, the cable or wire is a flexible cable or wire. By using a flexible cable / wire to provide the electrical connection, the bi-metal strip can bend more easily, and can be adjusted by the threaded member more easily, because the cable is flexible and does not exert any (or a very low, insignificant) force onto the bi-metal strip or carrier. The cable or wire should not be under any tension, to avoid exerting force on the bi-metal strip or carrier, which force may interfere with the calibration. In other examples, any suitable electrical connection can be made to the bi-metal strip.

Claims

1. A system for use as part of a circuit breaker (140), the system comprising:a carrier (104), wherein the carrier comprises a threaded aperture (106);a bi-metal strip (102) attached to the carrier (104); anda threaded member (108) configured to engage with the threaded aperture (106),wherein the threaded member (108) is configured to be rotated, and wherein rotation of the threaded member (108) is configured to adjust a position of the carrier (104).

2. The system of claim 1, wherein adjustment of the position of the carrier (104) is configured to move the bi-metal strip (102).

3. The system of any preceding claim, wherein the threaded member is configured to rotate about an axis (116) and wherein rotation of the threaded member (108) is configured to move the carrier (104) in a lateral direction (114) and the threaded member (108) is fixed in the lateral direction (114), optionally wherein the lateral direction (114) is parallel to the axis (116).

4. The system of claim 3, wherein a range of movement of the carrier in the lateral direction (114) is between 1 mm and 15 mm, optionally between 5 mm and 10 mm, optionally between 6 mm and 9 mm, optionally between 7 mm and 9 mm, optionally 8 mm.

5. The system of any preceding claim, wherein the bi-metal strip (102) is configured to actuate a mechanical latch (150) of a tripping mechanism of the circuit breaker (140).

6. The system of any preceding claim, wherein the threaded aperture (106) is at a first end of the carrier (104).

7. The system of claim 6, wherein a portion of the carrier (104) is fixed to a housing (110) of the circuit breaker (140), and wherein rotation of the threaded member (108) is configured to move the first end of the carrier (104) so as to deform the carrier (104).

8. The system of any preceding claim, wherein the threaded member (108) is contained within a housing (110) of the circuit breaker (140).

9. The system of claim 8, wherein the system further comprises an aperture (112) in the housing (110) of the circuit breaker (140) and a blocking element, wherein the aperture (112) is configured to provide access to the threaded member (108) and configured to be covered by the blocking element.

10. The system of any preceding claim, wherein the threaded member (108) is a screw or a bolt.

11. The system of any preceding claim, wherein the carrier (104) is made of metal and the circuit breaker (140) is made of a non-conducting material.

12. The system of any preceding claim, wherein the bi-metal strip (102) is rigidly coupled to the carrier, optionally welded to the carrier (104).

13. The system of any preceding claim, comprising:a cable electrically connected to the bi-metal strip; optionally, wherein the cable is a flexible cable.

14. A method (300) of calibrating a tripping mechanism of the circuit breaker (140) using the system of any preceding claim, wherein the method comprises:rotating (302) a threaded member (108), wherein the threaded member (108) is configured to engage with a threaded aperture (106) of a carrier;in response to rotating (304) the threaded member (108), causing an adjustment in a position of the carrier (104) in a lateral direction (114);in response to causing (306) an adjustment in the position of the carrier, causing an adjustment in a position of a bi-metal strip (102), wherein the bi-metal strip (102) is attached to the carrier (104).

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