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A submersible electrical motor that drives a pump has an electrical connector receptacle base. A plug opening extends from the base into an interior of the motor and has a side wall extending around a plug opening axis. An electrical connector plug at an end of a motor lead has a nose portion that s

A submersible electrical motor that drives a pump has an electrical connector receptacle base. A plug opening extends from the base into an interior of the motor and has a side wall extending around a plug opening axis. An electrical connector plug at an end of a motor lead has a nose portion that stabs into the plug opening and is surrounded by the side wall. An inward facing shoulder formed in the side wall faces inward into the motor. An outward facing shoulder on the nose portion faces outward from the motor interior and registers with the inward facing shoulder when the nose portion is fully received within the plug opening. A retainer inserts into engagement with the inward and outward facing shoulders to prevent outward movement of the plug in the plug opening. The retainer may be a pin or a ring.

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1. A well fluid pump assembly, comprising: a submersible pump driven by an electrical motor;an electrical connector receptacle base surface on the motor;a plug opening extending inward from the base surface into an interior of the motor along a plug opening axis, the plug opening having a side wall

1. A well fluid pump assembly, comprising: a submersible pump driven by an electrical motor;an electrical connector receptacle base surface on the motor;a plug opening extending inward from the base surface into an interior of the motor along a plug opening axis, the plug opening having a side wall extending around the axis within the interior of the motor, the side wall having an oblong configuration with two major diameter portions facing each other joined by two minor diameter portions facing each other, the minor diameter portions having shorter lengths than the major diameter portions;an electrical connector plug secured to a motor lead, the plug having a plurality of electrical terminals for delivering electrical power to the motor, the plug having a plug body with a nose portion that stabs into the plug opening and is surrounded by the side wall, the nose portion having an oblong configuration that mates with the oblong configuration of the side wall and has two major diameter portions facing away from each other joined by two minor diameter portions facing away from each other, the minor diameter portions of the nose portion having shorter lengths than the major diameter portions of the nose portion;a pair of plug opening grooves, each of the plug opening grooves being formed in one of the minor diameter portions of the side wall, the plug opening grooves being straight and parallel to each other;a pair of nose portion grooves, each of the nose portion grooves being formed in one of the minor diameter portions of the nose portion, the nose portion grooves being straight and parallel to each other, each of the nose portion grooves registering with one of the plug opening grooves when the nose portion is fully received within the plug opening;a pair of pin holes, each of the pin holes extending from an exterior of the motor and joining one of the plug opening grooves; anda pair of pins, each of the pins inserted into one of the pin holes and into engagement with one of the plug opening grooves and one of the nose portion grooves to prevent outward movement of the plug in the plug opening away from the interior of the motor. 2. The assembly according to claim 1, wherein the pin holes have threads, and the pins have threads that secure to the threads of the pin holes. 3. The assembly according to claim 1, wherein: each of the pins has a cylindrical portion and a conical tip; andthe insertion of each of the pins into the pins holes causes the conical tips to wedge the nose portion grooves into alignment with the plug opening grooves. 4. The assembly according to claim 1, wherein the plug body and the nose portion are formed of a single piece of material. 5. The assembly according to claim 1, further comprising: a seal extending around the axis and sealing between the nose portion and the side wall, the seal being inward toward the interior of the motor from the plug opening grooves and the nose portion grooves. 6. The assembly according to claim 1, further comprising: a gasket shoulder at a junction between the nose portion and the plug body that faces the base surface; anda gasket between the gasket shoulder and the base surface, the gasket forming a seal between the gasket shoulder and the base surface in response to insertion of the pins into the plug opening grooves and the nose portion grooves. 7. A well fluid pump assembly, comprising: a submersible pump driven by an electrical motor;an electrical connector receptacle base surface on the motor;a plug opening extending inward from the base surface into an interior of the motor along a plug opening axis, the plug opening having a side wall extending around the axis within the interior of the motor, the side wall having an oblong configuration with two major diameter portions facing each other joined by two minor diameter portions facing each other, the minor diameter portions having shorter lengths than the major diameter portions;an electrical connector plug secured to a motor lead, the plug having a plurality of electrical terminals for delivering electrical power to the motor, the plug having a plug body with a nose portion that stabs into the plug opening and is surrounded by the side wall, the nose portion having an oblong configuration that mates with the oblong configuration of the side wall and has two major diameter portions facing away from each other joined by two minor diameter portions facing away from each other, the minor diameter portions of the nose portion having shorter lengths than the major diameter portions of the nose portion;a pair of pin holes extending from an exterior of the motor, each of the pin holes joining one of the minor diameter portions of the side wall along a straight line tangent to said one of the minor diameter portions of the side wall to define a recess in said one of the minor diameter portions of the side wall that is open toward the axis, each of the pin holes having a set of threads at the exterior of the motor;a pair of grooves formed on the nose portion of the plug, each of the grooves being formed in one of the minor diameter portions of the nose portion each of the grooves aligning with one of the recesses when the nose portion is in a fully inserted position in the plug opening;a pair of pins, each of the pins being inserted through one of the pin holes into engagement with one of the recesses and one of the grooves when the nose portion is in the fully inserted position to retain the plug; whereineach of the pins has a cylindrical body with threads on one end that secure to the threads in one of the pin holes in response to rotation of the cylindrical body; andeach of the pins has a conical tip protruding from the cylindrical body, the conical tips wedging each of the grooves into alignment with one of the recesses as the cylindrical body is rotated. 8. The assembly according to claim 7, wherein each of the grooves extends along a straight line that coincides with the straight line of one of the pin holes. 9. The assembly according to claim 7, further comprising: a gasket shoulder on the plug that faces toward the base surface;a gasket located between the gasket shoulder and the base surface; and whereinthe conical portion of each of the pins creates an inward directed force on the plug to deform the gasket between the gasket shoulder and the base as the pins are rotated in the pin holes. 10. The assembly according to claim 7, further comprising: a seal extending around the axis and sealing between the nose portion and the side wall, the seal being located farther into the interior of the motor than the recesses and the grooves. 11. A well fluid pump assembly, comprising: a submersible pump driven by an electrical motor;an electrical connector having a plug opening extending into an interior of the motor along a plug opening axis, the plug opening having a side wall extending around the axis within the interior of the motor, the side wall having an elliptical configuration;a groove formed in the side wall and extending completely around the axis, the groove having an elliptical configuration;an electrical connector plug secured to a motor lead, the plug having a plurality of electrical terminals for delivering electrical power to the motor, the plug having a plug body with a nose portion having an elliptical configuration that stabs into the plug opening and is surrounded by the side wall;an outward facing shoulder on and extending around the nose portion, the outward facing shoulder facing outward from the interior of the motor and being recessed within the plug opening; anda retaining ring having an elliptical configuration, the retaining ring a larger diameter portion inserted into the groove and a smaller diameter portion overlying and engaging the outward facing shoulder. 12. The assembly according to claim 11, further comprising: a seal ring extending around the nose portion and in sealing engagement with the side wall at a point farther in the interior of the motor than the groove.