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An electrical connector for terminating an electrical cable and for engaging with a mating electrical connector comprises a body, resilient member, and a collar. The body has an engagement portion including a sleeve which extends in a longitudinal direction for engaging with the mating electrical co

An electrical connector for terminating an electrical cable and for engaging with a mating electrical connector comprises a body, resilient member, and a collar. The body has an engagement portion including a sleeve which extends in a longitudinal direction for engaging with the mating electrical connector. The sleeve comprises a keyway configured to receive a keyed mating connector. The resilient member is arranged on the sleeve and can deform in a transverse direction perpendicular to the direction and provide a reaction force for maintaining the engagement of the connector with the mating connector. The collar is configured to rotate about the sleeve, and comprises a radially inwardly protruding pin which extends into the sleeve and can be moved between two positions. One position is within the keyway between the key of the mating connector and the keyway opening such that the pin prevents axial disengagement of the connector.

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1. An electrical connector for terminating an electrical cable and for engaging with a mating electrical connector, the connector comprising: a body having an engagement portion including a sleeve which extends in a longitudinal first direction for engaging with the mating electrical connector, the

1. An electrical connector for terminating an electrical cable and for engaging with a mating electrical connector, the connector comprising: a body having an engagement portion including a sleeve which extends in a longitudinal first direction for engaging with the mating electrical connector, the sleeve further comprising at least one keyway configured to receive a keyed mating connector at a keyway opening;at least one resilient member arranged on the sleeve of the engagement portion, the resilient member being capable of deforming in a transverse direction perpendicular to the first direction and providing a reaction force for maintaining the engagement of the connector with the mating connector; anda collar configured to be rotatable about at least the sleeve, wherein the collar comprises a radially inwardly protruding pin which extends into the sleeve and can be moved between two positions, one of the two positions being within the keyway between the key of the mating connector and the keyway opening such that the pin prevents axial disengagement of the connector. 2. The electrical connector as claimed in claim 1, wherein the other of the two positions being within the keyway shielded by the sleeve such that the pin is unable to engage with the key of the mating connector. 3. The electrical connector as claimed in claim 1, wherein the at least one keyway comprises a circumferential keyway portion configured to receive the radially protruding pin. 4. The electrical connector as claimed in claim 1, wherein the at least one keyway comprises an axial keyway portion extending from the keyway opening to a keyway axial stop. 5. The electrical connector as claimed in claim 4, wherein the at least one keyway comprises a circumferential keyway portion configured to receive the radially protruding pin; and wherein the axial keyway portion is intersected by the circumferential keyway portion between the axial keyway stop and the keyway opening such that the key of the keyed mating connector is configured to be located at the keyway axial stop when the electrical connector is fully engaged with the mating electrical connector and the pin prevents axial disengagement of the connector by being located on the axial keyway between the key of the keyed mating connector and the keyway opening. 6. The electrical connector as claimed in claim 1, comprising a detent device to mechanically latch the collar in at least one of the two positions. 7. The electrical connector as claimed in claim 6, wherein the detent device comprises at least one axially biased ball bearing located within the collar and configured to engage detents formed in the sleeve at angular positions corresponding to at least one of the two positions. 8. The electrical connector as claimed in claim 1, further comprising an o-ring located between the collar and sleeve and configured to provide rotational resistance. 9. The electrical connector as claimed in claim 1, wherein an alignment notch is provided at a location around the outside of the sleeve. 10. The electrical connector as claimed in claim 1, wherein the collar comprises a shaped outer surface suitable for engaging a spanner to assist rotation of the collar. 11. A first electrical connector for engaging with a second electrical connector, the first electrical connector comprising: a projecting connection port, having electrical contacts within an end face of the port; anda protecting collar circumferentially around the connection port; anda key feature configured to interact with a keyway on the second electrical connector,an alignment feature configured to indicate a s position of the key feature;wherein the first electrical connector is configured such that the key feature can engage with a radially inwardly protruding pin on the second electrical connector,wherein the pin is configured to rotate from a first position on a first circumferential side of the alignment feature to a second position on a second circumferential side of the alignment feature; andwherein, when the pin is rotated to the second position, the key feature is locked in the keyway, thereby inhibiting axial disengagement of the first and second electrical connectors. 12. The first electrical connector as claimed in claim 11, wherein the electrical contacts comprise recesses in the end face. 13. The first electrical connector as claimed in claim 11, wherein the electrical contacts comprise pads flush with the end face. 14. A connector arrangement, comprising: a first electrical connector and a second electrical connector, the second electrical connector for mating with the first electrical connector, the first electrical connector comprising: a body having an engagement portion including a sleeve which extends in a longitudinal first direction for engaging with the second electrical connector, the sleeve further comprising at least one keyway configured to receive a keyed mating connector at a keyway opening;at least one resilient member arranged on the sleeve of the engagement portion, the resilient member being capable of deforming in a transverse direction perpendicular to the first direction and providing a reaction force for maintaining the engagement of the first electrical connector with the second electrical connector; anda collar configured to be rotatable about at least the sleeve, wherein the collar comprises a radially inwardly protruding pin which extends into the sleeve and can be moved between two positions, one of the two positions being within the keyway between the key of the second electrical connector and the keyway opening such that the pin prevents axial disengagement of the first electrical connector; andthe second electrical connector comprising: a projecting connection port, having electrical contacts within an end face of the port; anda protecting collar circumferentially around the connection port, with a key feature configured to interact with the keyway on the first electrical connector,wherein the first electrical connector comprises the radially inwardly protruding pin which when rotated to a position prevents axial disengagement of the second electrical connector by locking the key feature within the keyway. 15. The connector arrangement as claimed in claim 14, wherein with the first electrical connector, the other of the two positions being within the keyway shielded by the sleeve such that the pin is unable to engage with the key of the second electrical connector. 16. The connector arrangement as claimed in claim 14, further comprising a detent device in the first electrical connector to mechanically latch the collar in at least one of the two positions. 17. The connector arrangement as claimed in claim 14, further comprising an o-ring in the first electrical connector located between the collar and sleeve and configured to provide rotational resistance. 18. The connector arrangement as claimed in claim 14, wherein with the first electrical connector, the collar comprises a shaped outer surface suitable for engaging a spanner to assist rotation of the collar. 19. The connector arrangement as claimed in claim 14, wherein the electrical contacts in the second electrical connector comprise recesses in the end face. 20. The connector arrangement as claimed in claim 14, wherein the electrical contacts in the second electrical connector comprise pads flush with the end face.