POSITION ASSURANCE MEMBER

[0001] The subject matter herein relates generally to electrical connectors that have terminal position assurance devices or members to ensure that electrical terminals are properly loaded and secured within connector housings.

[0002] Electrical connectors typically include electrical terminals that are held within an insulative housing. The electrical terminals have to be properly positioned or seated within the housing in order to successfully mate to a corresponding electrical contact of a mating connector. If one or more of the terminals are not properly positioned, the connector may not operate as intended when mated to the mating connector. Once a malfunction is detected, it may be difficult to determine which of the terminals is at fault due to the number of terminals in the housing and poor accessibility of the terminals within the housing. Another concern with electrical connectors is retention of the terminals. For example, some terminals are retained within a cavity of the housing via small retention features, such as latches, that extend between the terminal and the housing within the cavity. However, the retention features may not be sufficiently robust to withstand pulling forces exerted on cables attached to the terminals, causing the retention features to fail and allowing the terminals to be pulled out of position.

[0003] The problem to be solved is to provide an electrical connector having an insertable device or member that robustly secures the terminals in the cavities of the housing and ensures that the terminals are properly positioned in the housing prior to mating the connector to a complementary mating connector.

[0004] This problem is solved by an electrical connector which includes a housing and a terminal position assurance (TPA) member. The housing has a mating end and a cable end. The housing defines cavities that extend from the cable end parallel to a cavity axis. The cavities hold corresponding terminals therein that are connected to one or more cables protruding from the cable end. The housing further includes a first wall and a second wall that define a TPA slot therebetween. The TPA slot is open to the cavities. The TPA member is mounted to the housing within the TPA slot. The TPA member has a front side that engages the first wall of the housing and a rear side that engages the second wall of the housing. The TPA member is movable relative to the housing between an unlocked position and a locked position along an actuation axis that is perpendicular to the cavity axis. The TPA member in the locked position extends into the cavities, and the front side of the TPA member engages respective back edges of the terminals to retain the terminals within the housing.

[0005] The invention will now be described by way of example with reference to the accompanying drawings in which:

[0006] Figure 1 is a perspective view of an electrical connector in accordance with an embodiment.

[0007] Figure 2 is an exploded perspective view of the electrical connector according to an embodiment.

[0008] Figure 3 is a top front perspective view of a terminal position assurance (TP A) member of the electrical connector according to an embodiment.

[0009] Figure 4 is a top rear perspective view of the TPA member of the electrical connector according to an embodiment.

[0010] Figure 5 is a bottom front perspective view of the TPA member of the electrical connector according to an embodiment.

[0011] Figure 6 is a bottom plan view of a portion of the TPA member of the electrical connector according to an embodiment.

[0012] Figure 7 is a perspective view of a portion of a housing of the electrical connector according to an embodiment showing a TPA slot.

[0013] Figure 8 is a cross-sectional view of the electrical connector showing the TPA member mounted to the housing in an unlocked position according to an embodiment. [0014] Figure 9 is a side cross-sectional view of the assembled electrical connector according to an embodiment, showing the TPA member in the unlocked position.

[0015] Figure 10 is a side cross-sectional view of the electrical connector according to an embodiment, showing the TPA member in a locked position.

[0016] Figure 11 is a perspective cross-sectional view of the electrical connector according to an embodiment, showing the TPA member in the locked position.

[0017] Figure 12 shows a perspective view of a portion of the electrical connector according to an embodiment, showing the TPA member in the locked position.

[0018] Figure l is a perspective view of an electrical connector 100 in accordance with an embodiment. The electrical connector 100 includes a housing 102, a terminal position assurance (TPA) member 104, and multiple terminals 106. The terminals 106 are held within corresponding cavities 108 (shown in Figure 2) defined in the housing 102. The terminals 106 are electrically connected and mechanically secured to one or more cables 110 that protrude from the housing 102 at a cable end 112 of the housing 102. Only short segments of the cables 110 are shown in Figures 1 and 2, but the cables 110 may have an extended length to connect the electrical connector 100 to a designated device, such as a battery, a computer, or the like. The electrical connector 100 in the illustrated embodiment holds two terminals 106, but may be configured to hold a single terminal 106 or at least three terminals 106 in other embodiments. The illustrated embodiment includes two cables 110 protruding separately from the cable end 112 of the housing 102, but the two cables 110 may be collectively surrounded by an outer jacket in an alternative embodiment. The electrical connector 100 optionally includes cable strain relief devices 113 mounted to the cable end 112 of the housing 102 and individually surrounding the cables 110 to provide strain relief and/or sealing of the housing 102 from dirt and debris.

[0019] In the illustrated embodiment, the housing 102 includes the cable end 112 and a mating end 114. The mating end 114 defines a mating interface for engaging a mating connector (not shown) during a mating operation. For example, the mating end 114 defines an opening 116 that receives the mating connector therethrough during the mating operation to allow mating contacts (not shown) of the mating connector to engage and electrically connect to the terminals 106.

[0020] The housing 102 may include a mating shroud 118 at the mating end 114 that defines a socket 119 extending into the housing 102 from the opening 116. The mating connector enters the socket 119 to engage the terminals 106. The housing 102 may define contact openings 122 within the socket 119 that provide access to the terminals 106. For example, the housing 102 may include a corresponding support box 124 for each of the terminals 106. The support boxes 124 are located within the socket 119 and define the contact openings 122. The support boxes 124 are configured to guide the mating contacts of the mating connector into engagement with the terminals 106 without stubbing against the terminals 106. In the illustrated embodiment, the TPA member 104 is mounted to the housing 102 and disposed within the socket 119. For example, the TPA member 104 is circumferentially surrounded by the mating shroud 118. The TPA member 104 is disposed proximate to the support boxes 124.

[0021] The electrical connector 100 optionally includes a liner 126 held within the mating shroud 118. The liner 126 may include a rubber material, a rubber-like material, or a plastic material that is held along an interior surface 128 of the mating shroud 118. The liner 126 may surround the TPA member 104 and the support boxes 124 of the housing 102. Optionally, the liner 126 may compress between the mating shroud 118 and a housing (not shown) of the mating connector during the mating operation to seal the interface, preventing debris and contaminants from entering the socket 119. The liner 126 may be a gasket, an O-ring, or the like. [0022] The electrical connector 100 in the illustrated embodiment also includes a locking lever 130 that is coupled to the housing 102 and pivotable relative to the housing 102. The locking lever 130 has a handle 132 configured to be actuated by an operator or user to pivot the lever 130 relative to the housing 102. The locking lever 130 engages the mating connector and pulls the mating connector into the socket 119 as the operator pivots the lever 130. The locking lever 130 may be configured to provide a mechanical advantage during the mating operation, reducing the amount of force exerted by the operator relative to mating the electrical connector 100 to the mating connector without the use of the locking lever 130. The locking lever 130 may also selectively secure or lock the mating connector to the electrical connector 100 in a mated position, preventing the mating connector from un-mating the connector 100. The locking lever 130 is optional, as the electrical connector 100 may omit the locking lever 130 in an alternative embodiment.

[0023] In an embodiment, the electrical connector 100 is a right angle connector. The housing 102 is shaped such that the cable end 112 of the housing 102 is oriented perpendicular to the mating end 114 of the housing 102. For example, a plane of the cable end 112 is oriented generally perpendicular (e.g., within plus or minus ten degrees from a right angle) relative to a plane of the mating end 114. The electrical connector 100 may be a plug connector that releasably mates to a mating header connector that is fixed in place on a device, such as a chassis, battery case, or the like. In one non-limiting application, the electrical connector 100 may be installed within a vehicle, such as an electric automobile. In an alternative embodiment, the electrical connector 100 mat be an in-line or straight connector, such that the housing 102 extends linearly between the cable end 112 and the mating end 114, and the cable and mating ends 112, 114 are oriented parallel to each other.

[0024] Figure 2 is an exploded perspective view of the electrical connector 100 according to an embodiment. In Figure 2, two terminals 106 are poised for loading into the cavities 108 of the housing 102 through the cable end 112, and the TPA member 104 is poised for mounting to the housing 102. The liner 126 and locking lever 130 (shown in Figure 1) are not shown in Figure 2. The housing 102 in an embodiment includes a neck portion 204 that extends from the mating shroud 118 of the housing 102 to the cable end 1 12.

[0025] The cavities 108 are open at the cable end 112 and extend through the neck portion 204 towards the socket 119. The cavities 108 extend through the neck portion 204 into the corresponding support boxes 124 within the socket 119 of the mating shroud 118. For example, the cavities 108 are open, or fluidly connected, to the socket 119 through the contact openings 122 of the support boxes 124. In an embodiment, the cavities 108 extend parallel to a cavity axis 206, such that the cavities 108 are parallel to each other. The cavity axis 206 in the illustrated embodiment is perpendicular to a mating axis along which the mating connector is received into the socket 119 of the mating shroud 118. The cavities 108 may be disposed side-by-side in the neck portion 204 along a row 208. Although the housing 102 only includes two cavities 108 in the illustrated embodiment, the housing 102 may include more or less than two cavities 108 in other embodiments.

[0026] The housing 102 defines a TPA slot 202 that receives the TPA member 104. The TPA slot 202 may be adjacent to the support boxes 124 of the housing 102. In an embodiment, the TPA slot 202 is disposed within the socket 119 of the mating shroud 118. In an alternative embodiment, the TPA slot 202 may be located along the neck portion 204 of the housing 102 instead of within the socket 119. The TPA slot 202 is open or fluidly connected to the cavities 108. For example, the TPA slot 202 may extend across the cavities 108 in the row 208. The TPA slot 202 in the illustrated embodiment extends across both of the two cavities 108, and is fluidly connected to both cavities 108.

[0027] The TPA member 104 is configured to be inserted into the TPA slot 202 in a loading direction 210 parallel to an actuation axis 212. In the illustrated embodiment, the TPA member 104 is loaded into the TPA slot 202 through the opening 116 at the mating end 114 of the housing 102. When the TPA member 104 is mounted to the housing 102, the TPA member 104 is selectively movable relative to the housing 102 along the actuation axis 212 between an unlocked position and a locked position. For example, during assembly of the electrical connector 100, the TPA member 104 may be disposed in the unlocked position. Once the terminals 106 are loaded within the cavities 108, an operator may move the TPA member 104 to the locked position. In the locked position, the TPA member 104 is configured to protrude into the cavities 108 to secure the terminals 106 in the housing 102. For example, the TPA member 104 in the locked position extends into each of the cavities 108 to block retreat of the terminals 106 out of the cavities 108 through the cable end 112. The TPA member 104 may provide a primary and/or sole means of retaining the terminals 106 in the housing 102, or alternatively may provide a secondary retaining means that supports a primary lock, such as deflectable spring beams (not shown) on the terminals 106 or within the cavities 108. The TPA member 104 in the unlocked position does not extend as far into the cavities 108, relative to the locked position, which allows the terminals 106 to be loaded into and removed (e.g., unloaded) from the cavities 108. The actuation axis 212 may be transverse to the cavity axis 206. For example, the actuation axis 212 may be perpendicular to the cavity axis 206.

[0028] The TPA member 104 may also provide terminal position assurance to indicate if any of the terminals 106 are not properly positioned within the housing 102. For example, if one or more of the terminals 106 are not fully loaded within the corresponding cavity 108, such terminal(s) 106 may obstruct movement of the TPA member 104 towards the locked position, providing a tactile and/or visual indication to the operator. The TPA member 104 may include an electrically insulative (e.g., dielectric) material, such as one or more plastics. Alternatively, the TPA member 104 may include one or more metals. The TPA member 104 may be formed by a molding process.

[0029] The terminals 106 of the electrical connector 100 are configured to be loaded into the cavities 108 through the cable end 112. The terminals 106 are loaded in a loading direction 214 that is parallel to the cavity axis 206. Each of the terminals 106 is loaded into a different one of the cavities 108. The terminals 106 of the electrical connector 100 each have a crimp barrel 138 and a contact segment 140. The crimp barrels 138 are crimped onto the respective cables 110. The contact segments 140 define distal ends 142 of the terminals 106 that are farthest from the cables 110. The contact segments 140 in the illustrated embodiment are blade receptacles configured to receive blade contacts of the mating connector therein through the contact openings 122 of the housing 102. Each of the contact segments 140 has two parallel side panels 218 extending from the distal end 142 to a back edge 220 of the contact segment 140. The back edge 220 faces towards the respective crimp barrel 138. The side panels 218 are spaced apart from each other to define a slot 222 that receive a corresponding mating blade contact therein. In an alternative embodiment, the terminals 106 may have different types of contact segments 140, such as round socket-style contacts, deflectable beam-style contacts, blade contacts, pin contacts, or the like. The terminals 106 may be configured to convey electrical power from the cables 110 to the mating connector that mates to the electrical connector 100. For example, the terminals 106 may convey high voltage electrical current up to or exceeding 1000 V. Alternatively, or in addition, the terminals 106 may be configured to convey electrical signals.

[0030] The electrical connector 100 may be used in various different applications, such as with vehicles, appliances, industrial machinery, and the like. In one non-limiting example, the electrical connector 100 may be installed within an electric vehicle. For example, the electrical connector 100 may represent part of, or connect to, a charger inlet harness of the vehicle that is used to charge a battery of the vehicle.

[0031] Figures 3-6 illustrate different views of the TPA member 104 of the electrical connector 100 according to an embodiment. For example, Figure 3 is a top front perspective view of the TPA member 104. Figure 4 is a top rear perspective view of the TPA member 104. Figure 5 is a bottom front perspective view of the TPA member 104. Figure 6 is a bottom plan view of a portion of the TPA member 104. In Figures 3-6, the TPA member 104 is oriented with respect to a vertical or elevation axis 191, a lateral axis 192, and a longitudinal or depth axis 193. The axes 191-193 are mutually perpendicular. Although the vertical axis 191 appears to extend generally parallel to gravity, it is understood that the axes 191-193 are not required to have any particular orientation with respect to gravity. [0032] The TPA member 104 has a front side 306 and a rear side 308 that is opposite to the front side 306. The TPA member 104 extends laterally (e.g. along the lateral axis 192) between a first edge side 312 and a second edge side 314 that is opposite the first edge side 312. As used herein, relative or spatial terms such as“top,”“bottom,”“upper,”“lower,”“front,� � and“rear” are only used to distinguish the referenced elements in the illustrated orientation and do not necessarily require particular positions or orientations in the surrounding environment of the TPA member 104 or the electrical connector 100.

[0033] The TPA member 104 includes a body 310 and multiple features, such as latches, posts, and the like, extending from the body 310. The TPA member 104 may have a unitary, one-piece construction such that the features are integrally connected to the body 310 (e.g., without using any fasteners, adhesives, or the like). Since the features are integral to the body 310, the TPA member 104 may lack seams between the body 310 and the features. The body 310 extends between a top end 302 and a bottom end 304 that is opposite to the top end 302. The front and rear sides 306, 308 extend vertically (e.g., along the vertical axis 191) from the top end 302 to the bottom end 304. When the TPA member 104 is mounted within the TPA slot 202 (shown in Figure 2) of the housing 102 (Figure 2) in the locked position, the top end 302 may face outward towards the mating end 114 (Figure 2) of the housing 102, as shown in Figure 1.

[0034] With reference to Figure 3, the front side 306 of the TPA member 104 includes blocking surfaces 316 along the body 310. The blocking surfaces 316 are planar. Each of the blocking surfaces 316 is configured to align with a different one of the cavities 108 (Figure 2). When the TPA member 104 is in the locked position, the blocking surfaces 316 extend into the corresponding cavities 108 and provide hard stop surfaces that engage the terminals 106 (Figure 2), blocking retreat of the terminals 106 towards the cable end 112 of the housing 102.

[0035] The TPA member 104 includes a guide post 318 that protrudes beyond the bottom end 304 of the body 310. The guide post 318 is configured to guide the insertion of the TPA member 104 into the TPA slot 202 (Figure 2) of the housing 102. The guide post 318 is located between the two blocking surfaces 316 in the illustrated embodiment. As shown in Figures 5 and 6, the TPA member 104 includes a gap 320 on either side of the guide post 318 that separates the guide post 318 from the blocking surfaces 316. The guide post 318 optionally includes a keying feature 322. The keying feature 322 in the illustrated embodiment is an enlarged head portion of the guide post 318 at the front side 306, such that the guide post 318 is wider at the front side 306 than at a rear edge 346 of the guide post 318. The keying feature 322 may support proper alignment of the TPA member 104 relative to the housing 102 by allowing the guide post 318 to enter a complementary guide channel 402 (shown in Figure 7) of the housing 102 in only a single orientation. For example, the guide post 318 may not fit within the guide channel 402 in other orientations besides the proper designated orientation due to the keying feature 322. In alternative embodiments, the TPA member 104 may include multiple guide posts 318, or may omit the guide post 318.

[0036] Referring now to Figure 4, the TPA member 104 may include deflectable mounting latches 324 configured to secure the TPA member 104 onto the housing 102 (Figure 2). For example, the mounting latches 324 prevent the TPA member 104 from moving upward along the actuation axis 212 (Figure 2) beyond the unlocked position and disengaging the housing 102. In an embodiment, the TPA member 104 includes a mounting latch 324 at each of the first and second edge sides 312, 314. The mounting latches 324 are cantilevered to extend from a respective fixed end 326 at the body 310 to a respective distal hook end 328. The hook ends 328 of the mounting latches 324 have catch surfaces 330. In the illustrated embodiment, the mounting latches 324 extend vertically downward from the fixed ends 326 to the distal hook ends 328.

[0037] With specific reference to Figure 4, the TPA member 104 may include one or more deflectable locking latches 332 disposed along the rear side 308. The TPA member 104 in the illustrated embodiment includes two locking latches 332. Each of the locking latches 332 includes a ridge 334 protruding rearward from the respective locking latch 332. As shown in Figures 4 and 5, the locking latches 332 extend from respective fixed ends 336 at the body 310 to respective distal, free ends 338, which are spaced apart from the body 310 and movable relative to the body 310. The fixed ends 336 are disposed at the bottom end 304 of the body 310 of the TPA member 104, and the locking latches 332 extend generally vertically upward towards the top end 302. For example, the free ends 338 are located more proximate to the top end 302 than the proximity of the fixed ends 336 to the top end 302. The locking latches 332 may have“J” shapes that curve from the bottom end 304 towards the top end 302.

[0038] In the illustrated embodiment, the distal, free ends 338 of the two locking latches 332 are connected to each other via a tab member 340 that bridges the two distal, free ends 338. The tab member 340 may be integrally connected to the distal, free ends 338. The tab member 340 is located at or proximate to the top end 302 of the TPA member 104. In an embodiment, the tab member 340 is configured to be moved by an operator to actuate the locking latches 332, as described in more detail herein. As shown in Figures 3 and 4, the distal, free ends 338 of the locking latches 332 and the tab member 340 are spaced apart from the body 310 at the top end 302 via a clearance gap 342. In an embodiment, the distal, free ends 338 of the locking latches 332 and the tab member 340 move into the clearance gap 342 when the locking latches 332 are deflected from the illustrated resting position. The tab member 340 may include a recess 344 that aligns with the guide post 318, allowing the locking latches 332 to deflect into the clearance gap 342 at least partially beyond the rear edge 346 of the guide post 318, as shown in Figure 6.

[0039] With specific reference to Figure 5, the TPA member 104 may include two overhanging shelf portions 350. One of the shelf portions 350 is located at a comer between the front side 306 and the first edge side 312, and the other shelf portion 350 is located at a comer between the front side 306 and the second edge side 314. The shelf portions 350 are configured to engage the housing 102 (Figure 2) when the TPA member 104 is in the locked position to prevent the TPA member 104 from moving along the actuation axis 212 (Figure 2) in the loading direction 210 (Figure 2) beyond the locked position. [0040] Figure 7 is a perspective view of a portion of the housing 102 of the electrical connector 100 according to an embodiment showing the TPA slot 202. The TPA slot 202 is defined between a first wall 404 and a second wall 406. The first wall 404 optionally extends between and divides the TPA slot 202 from the cavity openings 122. The TPA slot 202 extends through a platform 408 into the cavities 108. The first and second walls 404, 406 extend from the platform 408 towards the mating end 114 of the housing 102, as shown clearly in Figure 9. The first and second walls 404, 406 of the housing 102 may extend parallel to each other along a least a portion of the lateral lengths of the walls 404, 406. In the illustrated embodiment, the second wall 406 defines a cutout region 414 that is configured to accommodate the tab member 340 of the TPA member 104 (shown in Figure 4).

[0041] In an embodiment, the housing 102 includes partition walls 410 that extend across the TPA slot 202 between the first wall 404 and the second wall 406. The partition walls 410 are disposed laterally between the two cavities 108 of the housing 102. The housing 102 includes two partition walls 410 in the illustrated embodiment. The two partition walls 410 define the guide channel 402 that receives the guide post 318 of the TPA member 104, as shown in Figure 8. As shown in Figure 7, the partition walls 410 are shaped to define an enlarged portion 412 of the guide channel 402 at the first wall 404. The enlarged portion 412 is configured to receive the enlarged keying feature 322 of the guide post 318 shown in Figure 6. Due to the keying feature 322 and the enlarged portion 412 of the guide channel 402, the TPA member 104 is only able to be inserted into the TPA slot 202 of the housing 102 in a single orientation relative to the housing 102.

[0042] Figure 8 is a cross-sectional view of the electrical connector 100 showing the TPA member 104 mounted to the housing 102 in the unlocked position according to an embodiment. The cross-section is taken along the line 8-8 in Figure 7. Figure 8 shows the rear side 308 of the TPA member 104, and the cross- section extends through the ridges 334 (shown in Figure 4) of the locking latches 332. The terminals 106 are not loaded within the cavities 108 of the housing 102 in the illustrated embodiment. [0043] The housing 102 includes ledges 502 that extend into the TPA slot 202 from opposing interior walls 504 of the housing 102. An upper surface of each of the ledges 502 defines a portion of the platform 408 of the housing 102. Lower surfaces 506 of the ledges 502 face towards a back 508 of the mating shroud 118 that is opposite the mating end 114. The ledges 502 may project at least partially into the cavities 108 below the TPA slot 202.

[0044] During assembly, the TPA member 104 is moved in the loading direction 210 relative to the housing 102. If the TPA member 104 is properly aligned and oriented with the TPA slot 202 of the housing 102, the guide post 318 enters the guide channel 402 of the housing 102. The distal hook ends 328 of the mounting latches 324 engage and deflect around the ledges 502 of the housing 102. Once the catch surfaces 330 of the distal hook ends 328 pass beyond the lower surfaces 506 of the ledges 502, the mounting latches 324 resiliently move outward such that the catch surfaces 330 overlap the lower surfaces 506. Engagement between the catch surfaces 330 and the lower surfaces 506 of the ledges 502 may retain the TPA member 104 on the housing 102.

[0045] Figure 9 is a side cross-sectional view of the assembled electrical connector 100 according to an embodiment, showing the TPA member 104 in the unlocked position. In an embodiment, when the TPA member 104 is within the TPA slot 202, the front side 306 of the TPA member 104 engages the first wall 404 of the housing 102, and the rear side 308 of the TPA member 104 engages the second wall 406 of the housing 102. For example, the distance between the first and second walls 404, 406 may be only slightly greater than the thickness of the TPA member 104 between the front and rear sides 306, 308. As shown in Figure 9, when the TPA member 104 is in the unlocked position, the ridges 334 of the locking latches 332 engage an upper shoulder 602 of the second wall 406. Only one of the ridges 334 is visible in the illustrated cross-sectional view. The upper shoulder 602 of the second wall 406 may be the top end of the second wall 406. The engagement between the ridges 334 and the upper shoulder 602 retains the TPA member 104 in the unlocked position by restricting additional movement of the TPA member 104 in the loading direction 210. [0046] When the TPA member 104 is in the unlocked position, the TPA member 104 does not block the cavities 108, so the terminals 106 are able to be loaded into, and removed from, the housing 102. The illustrated embodiment shows one of the terminals 106 fully loaded within one of the cavities 108. The bottom end 304 of the TPA member 104 does not protrude far enough into the cavity 108 to restrict loading and unloading of the terminal 106. Optionally, the bottom end 304 may not extend into the cavity 108 at all when the TPA member 104 is in the unlocked position, such that the bottom end 304 of the TPA member 104 is disposed within the TPA slot 202. Alternatively, the bottom end 304 may project slightly into the cavity 108 without engaging the terminal 106. In an embodiment, the top end 302 of the TPA member 104 may project beyond the mating end 114 of the housing 102 when the TPA member 104 is in the unlocked position.

[0047] Figure 10 is a side cross-sectional view of the assembled electrical connector 100 according to an embodiment, showing the TPA member 104 in the locked position. The TPA member 104 is moved relative to the housing 102 from the unlocked position shown in Figure 9 to the illustrated locked position along the actuation axis 212, which is perpendicular to the cavity axis 206. The TPA member 104 may be pushed manually by an operator or automatically by the mating connector as the mating connector is mated. The TPA member 104 moves to the locked position in response to a force in the loading direction 210 that is sufficient to cause the locking latches 332 of the TPA member 104 to deflect around the upper shoulder 602 of the second wall 406. For example, the locking latches 332 deflect into the clearance gap 342, allowing the ridges 334 to release from and move beyond the upper shoulder 602.

[0048] Reference is now directed to Figure 11, which is a perspective cross-sectional view of the assembled electrical connector 100 showing the TPA member 104 in the locked position. Figure 11 is similar to Figure 10 except that the plane of cross-section in Figure 11 is offset from the plane of cross-section in Figure 10. When the TPA member 104 is moved towards the locked position, the TPA member 104 moves in the loading direction 210 until the shelf portions 350 of the TPA member 104 abut against the platform 408 of the housing 102. For example, the shelf portions 350 (also shown in Figure 5) overhang a portion of the platform 408 when the TPA member 104 is loaded in the TPA slot 202. The overhanging shelf portions 350 engage the platform 408 to block additional movement of the TPA member 104 in the loading direction 210 beyond the locked position. Due to the cross-section, only one of the shelf portions 350 is shown in Figure 11.

[0049] Referring now back to Figure 10, when the TPA member 104 is in the locked position, the TPA member 104 extends into the cavities 108. For example, the bottom end 304 of the TPA member 104 extends into the cavities 108, while an upper portion 704 of the TPA member 104 remains disposed within the TPA slot 202 between the first and second walls 404, 406 of the housing 102. The upper portion 704 may be defined vertically from the top end 302 to the ridges 334 of the locking latches 332. A lower portion 706 of the TPA member 104 that extends between the upper portion 704 and the bottom end 304 may enter the cavities 108.

[0050] The blocking surfaces 316 at the front side 306 are configured to engage the back edges 220 of the terminals 106 to retain the terminals 106 within the housing 102. For example, the lower portion 706 of the TPA member 104 projects a sufficient distance into the cavities 108 to overlap the back edges 220 of the terminals 106, effectively extending into a retreat path of the terminals 106. As a result, any rearward movement of the terminals 106 towards the cable end 112 causes the back edges 220 to abut against the blocking surfaces 316. Since the upper portion 704 of the TPA member 104 remains within the TPA slot 202, the engagement between the upper portion 704 and the first and second walls 404, 406 may withstand rotational forces (e.g., torque) exerted on the lower portion 706 of the TPA member 104 by the terminals 106.

[0051] In addition to providing a primary lock to retain the terminals 106 in the housing 102, the TPA member 104 may also provide terminal position assurance. For example, if the illustrated terminal 106 is not fully loaded within the cavity 108, the contact segment 140 of the terminal 106 may obstruct the TPA member 104 from moving from the unlocked position to the locked position. The obstructed movement of the TPA member 104 provides an indication that at least one of the terminals 106 is not fully loaded.

[0052] In an embodiment, the TPA member 104 in the locked position is blocked from unintentional or premature movement towards the unlocked position by engagement between the ridges 334 of the locking latches 332 and a lower shoulder 702 of the second wall 406. In the locked position, the TPA member 104 may be recessed within the socket 119 of the housing 102.

[0053] Reference is now made to Figure 12, which shows a perspective view of a portion of the electrical connector 100 according to an embodiment, showing the TPA member 104 in the locked position. In an embodiment, when the TPA member 104 is in the locked position, the tab member 340 of the TPA member 104 is received within the cutout region 414 of the second wall 406. The cutout region 414 provides space for an operator to access the tab member 340 to selectively manually move the tab member 340 into the clearance gap 342. The movement of the tab member 340 deflects the locking latches 332 and releases the ridges 334 (shown in Figure 10) from the lower shoulder 702 (Figure 10) of the second wall 406, allowing the TPA member 104 to be moved from the locked position to the unlocked position.