Service plug

Abstract

To provide a service plug capable of assuring appropriate time lag after cutting off a signal circuit until cutting off a power supply circuit.SOLUTION: A service plug 1 includes a housing 2 for holding a first terminal pair connected to a power supply circuit and a second terminal pair connected to a signal circuit, a cover 3 for making the first terminal pair to connection state and the second terminal pair to cut-off state when the cover is at a half-fitted position against the housing, a locking part 24 arranged on the housing for locking the cover at the half-fitted position, and a release mechanism 6 for releasing the lock, the release mechanism includes an arm 42 provided on the cover and a support projection 25 provided on the housing, when a pressing force F1 is applied to an operation part 47 and a fulcrum point part 48 is supported by the support projection, the arm elastically deforms so as to release the lock by the locking part, and the supporting projection is arranged so as to support the fulcrum point part when the cover is at the half-fitted position and not to support the fulcrum point when the cover is at a fully fitted position.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a service plug. [Background technology]

[0002] Conventionally, there are service plugs. Patent Document 1 discloses a power supply circuit breaker that can prevent problems caused by residual electric charge after a signal circuit switch is turned off. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-243559 Summary of the Invention [Problem to be solved by the invention]

[0004] Some service plugs are configured to first shut off the signal circuit and then the power circuit when the plug is removed. The shut-off signal circuit opens a switch, switching the power circuit to an open circuit. It is desirable for such service plugs to ensure an appropriate time lag between shutting off the signal circuit and shutting off the power circuit.

[0005] An object of the present invention is to provide a service plug that can ensure an appropriate time lag between the time when the signal circuit is cut off and the time when the power circuit is cut off. [Means for solving the problem]

[0006] The service plug of the present invention includes a housing that holds a first terminal pair connected to a power supply circuit that connects a power source and a load and a second terminal pair connected to a signal circuit for interrupting the power supply circuit; a cover that is configured to fit into the housing along a fitting direction, and that puts the first terminal pair in a connected state and the second terminal pair in a disconnected state when in a partially fitted position with respect to the housing, and that puts both the first terminal pair and the second terminal pair in a connected state when in a fully fitted position with respect to the housing; a locking portion that is disposed on a side wall of the housing and locks the cover in the partially fitted position when the cover is removed from the housing along the fitting direction; and a locking portion that locks the cover in the partially fitted position. and a release mechanism for releasing the engagement, the release mechanism including an arm provided on the cover and extending in the fitting direction, and a support protrusion provided on the side wall of the housing, the arm having an engaged portion that is engaged by the engagement portion, an operating portion, and a fulcrum portion, and elastically deforming so as to release the engagement by the engagement portion when a pressing force toward the side wall acts on the operating portion and the fulcrum portion is supported by the support protrusion, the support protrusion being positioned so as to support the fulcrum portion when the cover is in the semi-engaged position, and to be unable to support the fulcrum portion by shifting from the fulcrum portion when the cover is in the fully engaged position. [Effects of the Invention]

[0007] The service plug of the present invention includes a locking portion that locks the cover in the partially mated position and a release mechanism that releases the locking portion. The release mechanism includes an arm that is provided on the cover and extends in the mating direction, and a support protrusion that is provided on a side wall of the housing. The support protrusion supports the fulcrum portion of the arm when the cover is in the partially mated position, and is positioned so that it cannot shift from the fulcrum portion and support the fulcrum portion when the cover is in the fully mated position. The service plug of the present invention has the advantage of ensuring an appropriate time lag between shutting off the signal circuit and shutting off the power circuit. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a service plug according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the service plug according to the embodiment. [Figure 3] FIG. 3 is an exploded perspective view of the service plug according to the embodiment. [Figure 4] FIG. 4 is a front view showing the service plug according to the embodiment in a completely fitted state. [Figure 5] FIG. 5 is a front view showing the service plug according to the embodiment in a partially fitted state. [Figure 6] FIG. 6 is a cross-sectional perspective view of the cover according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional perspective view of the service plug according to the embodiment. [Figure 8] FIG. 8 is a cross-sectional perspective view of the service plug according to the embodiment. [Figure 9] FIG. 9 is a cross-sectional view of the service plug according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A service plug according to an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited to this embodiment. Furthermore, the components in the following embodiments include those that can be easily imagined by a person skilled in the art or that are substantially the same.

[0010] [Embodiment] An embodiment will be described with reference to FIGS. 1 to 9. This embodiment relates to a service plug. FIGS. 1 and 2 are perspective views of the service plug according to the embodiment, FIG. 3 is an exploded perspective view of the service plug according to the embodiment, FIG. 4 is a front view showing the service plug according to the embodiment in a fully mated state, FIG. 5 is a front view showing the service plug according to the embodiment in a partially mated state, FIG. 6 is a cross-sectional perspective view of the cover according to the embodiment, FIGS. 7 and 8 are cross-sectional perspective views of the service plug according to the embodiment, and FIG. 9 is a cross-sectional view of the service plug according to the embodiment. FIGS. 6 to 9 show a cross section taken along line VI-VI in FIG. 4.

[0011] As shown in Figures 1 to 3, the service plug 1 of this embodiment includes a housing 2, a cover 3, and a release mechanism 6. The service plug 1 is installed, for example, on a high-voltage power supply circuit of a vehicle (such as an electric vehicle or a hybrid vehicle) that uses a rotating machine as its power source. The service plug 1 is used to shut off the power supply circuit when performing maintenance work on components related to the power supply circuit, and to restore the power supply circuit after the maintenance work is completed.

[0012] As shown in FIG. 4 and other figures, the service plug 1 is disposed in a power supply circuit 120. The power supply circuit 120 is a circuit for electrically connecting a power supply 100 of a vehicle to a load 110 of the vehicle. The power supply 100 is, for example, a battery that can be charged and discharged. The load 110 is, for example, a rotating electric machine for driving the vehicle. The housing 2 holds a first terminal pair 20 connected to the power supply circuit 120. The first terminal pair 20 has a power supply side terminal 20a that is connected to the power supply 100 and a load side terminal 20b that is connected to the load 110. The first terminal pair 20 can make the power supply circuit 120 a closed circuit by connecting the terminals 20a, 20b, and can make the power supply circuit 120 an open circuit by disconnecting the terminals 20a, 20b.

[0013] The cover 3 holds a fuse unit 30 that can connect the first terminal pair 20. The fuse unit 30 is a connecting member that electrically connects the first terminal pair 20. The fuse unit 30 has a fuse body 31 and terminals 32 and 33. The fuse unit 30 electrically connects the terminals 20a and 20b by having the terminal 32 contact the terminal 20a and the terminal 33 contact the terminal 20b. The service plug 1 of this embodiment is configured so that the terminal 32 mates with the terminal 20a along the mating direction Z, and the terminal 33 mates with the terminal 20b along the mating direction Z. The mating direction Z is the direction in which the cover 3 mates with or separates from the housing 2.

[0014] The housing 2 holds a second terminal pair 21 connected to a signal circuit 200. The signal circuit 200 is a circuit having a switch 210 that can open and close the power supply circuit 120. The second terminal pair 21 has terminals 21a and 21b.

[0015] The cover 3 holds a conductor 34 that can connect the second terminal pair 21. The conductor 34 is a switch terminal that connects or disconnects the two terminals 21a, 21b. The conductor 34 electrically connects the terminals 21a and 21b by contacting both the terminals 21a and 21b. The service plug 1 of this embodiment is configured so that the conductor 34 fits into the terminals 21a and 21b along the fitting direction Z.

[0016] The housing 2 is molded from, for example, an insulating synthetic resin. As shown in FIG. 3 and other figures, the housing 2 has a main body 22 and a flange portion 23. The main body 22 is cylindrical with a bottom. The cross-sectional shape of the illustrated main body 22 is substantially rectangular. As shown in FIG. 3, the main body 22 has a first side wall 22a, a second side wall 22b, a third side wall 22c, and a fourth side wall 22d. The first side wall 22a and the second side wall 22b face each other in the first direction X. The third side wall 22c and the fourth side wall 22d face each other in the second direction Y. The fitting direction Z is the axial direction of the main body 22.

[0017] The first direction X and the second direction Y are both perpendicular to the fitting direction Z. The first direction X and the second direction Y are also perpendicular to each other. In the illustrated housing 2, the short-side direction of the rectangular cross section of the main body 22 is the first direction X, and the long-side direction is the second direction Y.

[0018] The first side wall 22a is provided with a locking portion 24 that locks the cover 3. The locking portion 24 protrudes from the outer surface of the first side wall 22a along the first direction X. The illustrated locking portion 24 has a claw shape and has a locking surface that faces the flange portion 23.

[0019] The first side wall 22a is provided with a support protrusion 25, which is part of a release mechanism described below. The support protrusion 25 protrudes from the outer surface of the first side wall 22a along the first direction X. The housing 2 of this embodiment has two support protrusions 25. The two support protrusions 25 are arranged on either side of the locking portion 24 in the second direction Y.

[0020] The third side wall 22c and the fourth side wall 22d each have one cam pin 26. The cam pin 26 is inserted into a cam groove 51 of the lever 5 of the cover 3. The flange portion 23 protrudes from the outer surface of the main body 22 and surrounds the main body 22 in an annular shape. The flange portion 23 is fixed to the vehicle body by fastening members such as bolts. The flange portion 23 is located at an end of the main body 22 in the fitting direction Z.

[0021] 2, the second side wall 22b is provided with a locking portion 27 that locks the lever 5. The illustrated locking portion 27 has a claw shape and has a locking surface that faces the flange portion 23.

[0022] The cover 3 has a main body 4 and a lever 5. The main body 4 and the lever 5 are molded from, for example, an insulating synthetic resin. The main body 4 is a portion that fits with the main body 22 of the housing 2. The main body 4 has a top wall 40 and a cylindrical peripheral wall 41. The peripheral wall 41 stands upright from the edge of the top wall 40 along the fitting direction Z. The cross-sectional shape of the illustrated main body 4 is approximately rectangular.

[0023] The peripheral wall 41 has a first side wall 41a, a second side wall 41b, a third side wall 41c, and a fourth side wall 41d. The side walls 41a, 41b, 41c, and 41d correspond to the side walls 22a, 22b, 22c, and 22d of the housing 2. The first side wall 41a and the second side wall 41b face each other in the first direction X. The third side wall 41c and the fourth side wall 41d face each other in the second direction Y.

[0024] 3, the first side wall 41a is provided with an arm 42 and a guard wall 43. The arm 42 and the guard wall 43 are formed integrally with the main body 4. The guard wall 43 is disposed so as to surround the arm 42 from the outside, and protects the arm 42 from unintentional release operations.

[0025] As shown in FIG. 6, the arm 42 has a first arm 44, a latched portion 45, a second arm 46, and an operating portion 47. The first arm 44 is connected to the end of the first side wall 41a on the top wall 40 side. The first arm 44 extends along the fitting direction Z toward the open end 41e of the peripheral wall 41. The end of the first arm 44 on the open end 41e side is a free end that is not fixed. The illustrated arm 42 has two first arms 44. The two first arms 44 are aligned in the second direction Y.

[0026] The locked portion 45 is connected to the free end of the first arm 44. The locked portion 45 extends from one first arm 44 to the other first arm 44 in the second direction Y. In other words, the locked portion 45 is a beam portion connecting the two first arms 44. The first arm 44 is formed to be flexible. Therefore, the first arm 44 can elastically deform so as to move the locked portion 45 relative to the first side wall 41a in the first direction X.

[0027] The second arm 46 extends from the locked portion 45 toward the top wall 40 along the fitting direction Z. The illustrated arm 42 has two second arms 46. One second arm 46 is connected to one end of the locked portion 45, and the other second arm 46 is connected to the other end of the locked portion 45. The second arm 46 is disposed outward in the second direction Y relative to the first arm 44. In other words, the two first arms 44 are disposed between the two second arms 46.

[0028] The operating portion 47 is connected to the end of the second arm 46 on the top wall 40 side. In other words, the base end of the second arm 46 is connected to the locked portion 45, and the tip of the second arm 46 is connected to the operating portion 47. The operating portion 47 extends from one second arm 46 to the other second arm 46 along the second direction Y. In other words, the operating portion 47 is a beam portion that connects the two second arms 46. The illustrated operating portion 47 has a flat plate shape and faces the first side wall 41a.

[0029] As described above, arm 42 in this embodiment is bent to form a substantial V-shape in side view. One end of the V-shape of arm 42 is connected to first side wall 41a, and the other end of the V-shape is a free end that is connected to operating portion 47. Furthermore, locked portion 45 is disposed at the bent portion of the V-shape of arm 42.

[0030] The second arms 46 are provided with fulcrum portions 48. Each of the two second arms 46 has one fulcrum portion 48. The fulcrum portions 48 protrude toward the first side wall 41a. The illustrated fulcrum portion 48 has a tapered shape that narrows toward the tip in the protruding direction. The fulcrum portion 48 has an engaged surface 48a. The engaged surface 48a extends in the first direction X and faces the top wall 40.

[0031] As shown in Figures 2 and 3, the lever 5 is bent into a substantially U-shape. Cam grooves 51 and through-holes 52 are provided at the two ends of the lever 5. The cam grooves 51 are arc-shaped. Support pins 49 are provided at the third side wall 41c and the fourth side wall 41d of the main body 4. The support pins 49 are inserted into the through-holes 52 of the lever 5. The support pins 49 support the lever 5 so that it can rotate freely. As shown in Figure 3, the main body 4 of the cover 3 is fitted into the housing 2 along the fitting direction Z. At this time, the cam pins 26 of the housing 2 are inserted into the cam grooves 51 of the lever 5.

[0032] When the lever 5 is rotated, the cam groove 51 guides the cam pin 26, causing the cover 3 to move relative to the housing 2 in the fitting direction Z. The lever 5 can rotate in a connecting direction R1 or a disconnecting direction R2. The connecting direction R1 is the rotation direction when the power supply circuit 120 is energized. The disconnecting direction R2 is the rotation direction when the power supply circuit 120 is disconnected.

[0033] When the lever 5 rotates in the connecting direction R1, the main body 4 of the cover 3 moves toward a fully mated position relative to the housing 2. In other words, by rotating the lever 5 in the connecting direction R1, the operator can move the main body 4 in a direction approaching the flange portion 23 of the housing 2. In the following description, the direction approaching the fully mated position is referred to as the insertion direction Z1, and the direction moving away from the fully mated position is referred to as the removal direction Z2.

[0034] On the other hand, when the lever 5 rotates in the blocking direction R2, the main body 4 moves in the removal direction Z2 relative to the housing 2. In other words, by rotating the lever 5 in the blocking direction R2, the operator can move the main body 4 in a direction away from the flange portion 23.

[0035] 1, 4, and 7 show the service plug 1 with the cover 3 in a fully mated position relative to the housing 2. The lever 5 is held in a tilted position and extends along the first direction X. The body 4 of the cover 3 is pushed all the way in along the mating direction Z and is fully mated with the housing 2. The lever 5 engages with and is locked by the locking portion 27 of the housing 2 (see FIG. 2).

[0036] As shown in FIG. 4, terminal 32 is mated with terminal 20a, and terminal 33 is mated with terminal 20b. Fuse unit 30 electrically connects terminal 20a and terminal 20b. Furthermore, conductor 34 held by cover 3 is mated with terminal 21a and terminal 21b, electrically connecting the two terminals 21a and 21b. Signal circuit 200 closes switch 210 when terminals 21a and 21b are connected. This closes power supply circuit 120, connecting power supply 100 and load 110.

[0037] 7, when the cover 3 is in the fully fitted position, the locked portion 45 is located further back in the insertion direction Z1 than the locking portion 24. In other words, the locked portion 45 is spaced apart from the locking portion 24 and closer to the flange portion 23 than the locking portion 24. Furthermore, the fulcrum portion 48 of the arm 42 is located further back in the insertion direction Z1 than the support protrusion 25 of the housing 2. In other words, the support protrusion 25 is offset from the fulcrum portion 48 in the fitting direction Z.

[0038] The guard wall 43 covers the entire arm 42 from both sides in the second direction Y. The guard wall 43 faces the locked portion 45 in the first direction X and covers the locked portion 45. The gap between the guard wall 43 and the flange portion 23 is sufficiently small. The guard wall 43 can prevent the operator's fingers from accidentally touching the locked portion 45.

[0039] When switching the power supply circuit 120 from a closed circuit to an open circuit, the operator moves the main body 4 of the cover 3 in the removal direction Z2. In this case, the operator unlocks the lever 5 and rotates the lever 5 in the interrupting direction R2. The operator rotates the lever 5 in the interrupting direction R2. As a result, the main body 4 of the cover 3 moves in the removal direction Z2 relative to the housing 2, as shown by the arrow AR1 in FIG. 8. The locking portion 24 of the housing 2 locks the main body 4 in the partially engaged position.

[0040] 2, 5, and 8 show the service plug 1 with the cover 3 in the partially mated position. At this time, the lever 5 is tilted relative to both the first direction X and the mating direction Z.

[0041] When the cover 3 is in the half-engaged position, as shown in FIG. 5, the terminal 32 is engaged with the terminal 20a, and the terminal 33 is engaged with the terminal 20b. In other words, the fuse unit 30 maintains an electrical connection between the terminals 20a and 20b. Meanwhile, the conductor 34 is disengaged from the terminals 21a and 21b. In other words, the connection between the terminals 21a and 21b is interrupted. When the connection between the terminals 21a and 21b is interrupted, the signal circuit 200 opens the switch 210. This opens the power supply circuit 120, disconnecting the power supply 100 from the load 110. Furthermore, opening the switch 210 disconnects the service plug 1 from the power supply 100. Therefore, the operator can perform subsequent work with the service plug 1 disconnected from the power supply 100.

[0042] When the cover 3 is in the partially fitted position, as shown in Fig. 8, the locked portion 45 of the arm 42 is locked by the locking portion 24 of the housing 2. The locking surface of the locking portion 24 locks the locked portion 45 and restricts movement of the cover 3 in the removal direction Z2. The support protrusion 25 of the housing 2 faces the fulcrum portion 48 of the arm 42 in the first direction X. The support protrusion 25 is close to or in contact with the fulcrum portion 48.

[0043] When the operator moves the cover 3 further from the half-fitted position in the removal direction Z2, the operator must perform a release operation on the release mechanism 6. As shown in FIG. 8 and other figures, the release mechanism 6 of this embodiment includes an arm 42 and a support protrusion 25. When the operator releases the lock provided by the locking portion 24, the operator applies a pressing force F1 to the operating portion 47, as shown in FIG. 8. The pressing force F1 is a force directed toward the first side wall 22a of the housing 2. The support protrusion 25 supports the fulcrum portion 48, causing the second arm 46 to function as a lever.

[0044] The arm 42 supported by the support protrusion 25 is elastically deformed by the pressing force F1. More specifically, the arm 42 is deformed so that the operating portion 47 approaches the first side wall 41a and the locked portion 45 moves away from the first side wall 41a as indicated by the arrow AR2. The deformation of the arm 42 releases the lock provided by the locking portion 24. As a result, the main body 4 of the cover 3 can be further moved in the removal direction Z2. When the cover 3 moves further in the removal direction Z2 from the partially engaged position, the terminals 32 and 33 are released from the terminals 20a and 20b.

[0045] As will be described below, the service plug 1 of this embodiment is configured to restrict removal operations while the pressing force F1 is still being applied. In Figure 9, the arm 42 deformed by the pressing force F1 is shown by a dashed line. When the pressing force F1 is applied to the arm 42 before the partially engaged position, the fulcrum portion 48 faces the support protrusion 25 in the mating direction Z. Therefore, when the cover 3 moves in the removal direction Z2 as indicated by the arrow AR1, the fulcrum portion 48 is locked by the support protrusion 25. The support protrusion 25 locks the locked surface 48a of the fulcrum portion 48.

[0046] This restricts movement of the cover 3 at a position before the half-mated position. In other words, the operator cannot move the cover 3 to the half-mated position while applying the pressing force F1. The operator must release the pressing force F1 to move the cover 3 to the half-mated position and then perform the release operation on the release mechanism 6 again. Therefore, the service plug 1 of this embodiment can stop the cover 3 in the half-mated position until the power circuit 120 switches to a closed circuit.

[0047] As described above, the service plug 1 of this embodiment includes the housing 2, the cover 3, the locking portion 24, and the release mechanism 6. The housing 2 holds the first terminal pair 20 and the second terminal pair 21. The first terminal pair 20 is connected to the power supply circuit 120 that connects the power supply 100 and the load 110. The second terminal pair 21 is connected to the signal circuit 200 for interrupting the power supply circuit 120. The cover 3 is configured to fit into the housing 2 along the fitting direction Z. When the cover 3 is in a partially fitted position with the housing 2, the cover 3 puts the first terminal pair 20 in a connected state and the second terminal pair 21 in an interrupted state. Furthermore, the cover 3 is configured to put both the first terminal pair 20 and the second terminal pair 21 in a connected state when the cover 3 is in a fully fitted position with the housing 2.

[0048] The locking portion 24 is disposed on the first side wall 22a of the housing 2. The locking portion 24 locks the cover 3 in a semi-fitted position when the cover 3 is removed from the housing 2 in the fitting direction Z. The release mechanism 6 is a mechanism for releasing the locking effected by the locking portion 24. The release mechanism 6 includes an arm 42 and a support protrusion 25. The arm 42 is provided on the cover 3 and extends in the fitting direction Z. The support protrusion 25 is provided on the first side wall 22a of the housing 2.

[0049] The arm 42 has a locked portion 45 that is locked by the locking portion 24, an operating portion 47, and a fulcrum portion 48. The arm 42 elastically deforms to release the locking by the locking portion 24 when a pressing force F1 toward the first side wall 22a acts on the operating portion 47 and the fulcrum portion 48 is supported by the support protrusion 25. The support protrusion 25 is positioned so as to support the fulcrum portion 48 when the cover 3 is in the partially engaged position, and so as not to be able to support the fulcrum portion 48 by shifting from the fulcrum portion 48 when the cover 3 is in the fully engaged position.

[0050] With the service plug 1 of this embodiment, the release operation must be performed after the cover 3 has been moved from the fully mated position to the partially mated position. The release mechanism 6 is configured so that the release operation will not occur even if pressing force F1 is applied in the fully mated position. Therefore, the service plug 1 of this embodiment can create a time lag between the time the signal circuit 200 is shut off and the time the power circuit 120 is shut off, and the time the operator completes the release operation. Therefore, the service plug 1 of this embodiment can ensure an appropriate time lag between the time the signal circuit 200 is shut off and the time the power circuit 120 is shut off.

[0051] In this embodiment, the fulcrum portion 48 is a protrusion that protrudes toward the first side wall 22a of the housing 2. This configuration makes it possible to prevent the service plug 1 from becoming too large while ensuring a sufficient stroke for unlocking.

[0052] The fulcrum portion 48 of this embodiment has an engaged surface 48a that is engaged by the support protrusion 25 when the cover 3 moves from the fully engaged position toward the partially engaged position with the pressing force F1 acting on the operating portion 47. With this configuration, if the operator applies the pressing force F1 at a position before the partially engaged position, the lock cannot be released.

[0053] The connecting member connecting the first terminal pair 20 is not limited to the fuse unit 30. The connecting member connecting the first terminal pair 20 may be, for example, a terminal member without a fuse function. The configuration for physically contacting the terminals 32, 33 with the terminals 20a, 20b is not limited to the illustrated configuration. For example, the terminal 32 and the terminal 20a may be male terminals and the other female terminals, but is not limited to this. The configuration for physically contacting the conductor 34 with the terminals 21a, 21b is not limited to the illustrated configuration. For example, the conductor 34 and the terminals 21a, 21b may be male terminals and the other female terminals, but is not limited to this.

[0054] The arrangement and shape of the arm 42 and the support protrusion 25 are not limited to the illustrated arrangement and shape. The arm 42 and the support protrusion 25 are configured as appropriate so that the support protrusion 25 can support the fulcrum portion 48 when the cover 3 is in the half-fitted position. The support protrusion 25 is desirably configured so that it cannot support the fulcrum portion 48 when the position of the cover 3 is shifted in the insertion direction Z1 from the half-fitted position. The support protrusion 25 is configured, for example, so that it supports the fulcrum portion 48 when the locked portion 45 is locked by the locking portion 24, and cannot support the fulcrum portion 48 when the locked portion 45 is separated from the locking portion 24.

[0055] The contents disclosed in the above embodiments can be implemented in appropriate combinations. [Explanation of symbols]

[0056] 1 Service plug 2: Housing, 3: Cover, 4: Main body, 5: Lever 6:Release mechanism 20: first terminal pair, 20a, 20b: terminals 21: second terminal pair, 21a, 21b: terminals 22: Main body, 22a: First side wall, 22b: Second side wall, 22c: Third side wall 22d: Fourth side wall 23: flange portion, 24: locking portion, 25: support projection 26: Cam pin, 27: Locking portion 30: fuse unit, 31: fuse body, 32, 33: terminals 34: Conductor 40: Top wall, 41: Peripheral wall, 41a: First side wall, 41b: Second side wall 41c: Third side wall, 41d: Fourth side wall, 41e: Open end 42: Arm; 43: Guard wall; 44: First arm; 45: Locked portion 46: second arm, 47: operating portion, 48: fulcrum portion 100: Power supply, 110: Load, 120: Power supply circuit 200: signal circuit, 210: switch X: first direction, Y: second direction Z: Mating direction, Z1: Insertion direction, Z2: Removal direction

Claims

1. a housing for holding a first terminal pair connected to a power supply circuit that connects a power supply and a load, and a second terminal pair connected to a signal circuit for interrupting the power supply circuit; a cover configured to be fitted to the housing along a fitting direction, the cover bringing the first terminal pair into a connected state and the second terminal pair into a disconnected state at a semi-fitted position with respect to the housing, and bringing both the first terminal pair and the second terminal pair into a connected state at a fully fitted position with respect to the housing; a locking portion disposed on a side wall of the housing, the locking portion locking the cover at the partial engagement position when the cover is removed from the housing along the engagement direction; a release mechanism that releases the locking by the locking portion; Equipped with the release mechanism includes an arm provided on the cover and extending in the fitting direction, and a support protrusion provided on the side wall of the housing, the arm has a locked portion that is locked by the locking portion, an operating portion, and a fulcrum portion, and is elastically deformed so as to release the locking by the locking portion when a pressing force toward the side wall acts on the operating portion and the fulcrum portion is supported by the support protrusion; The support projection is disposed so as to support the fulcrum portion when the cover is in the partially fitted position, and so as not to be displaced from the fulcrum portion and not to support the fulcrum portion when the cover is in the fully fitted position. A service plug characterized by:

2. The fulcrum portion is a protrusion that protrudes toward the side wall. The service plug of claim 1 .

3. The fulcrum portion has a locked surface that is locked by the support protrusion when the cover moves from the fully engaged position toward the partially engaged position with the pressing force acting on the operating portion.

3. The service plug of claim 2.

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