An insulation displacement contact configured to receive an electrical cable, the insulation displacement contact comprising: a base configured to be mounted onto a substrate so as to place the insulation displacement contact in electrical communication with the substrate; and a first arm and a second arm, that extend out with respect to the base, the first arm including first and second opposed portions (50a, 50b) that face each other so as to define a first insulation displacement slot there between, wherein the first and second opposed portions are configured to move away from each other in response to insertion of the electrical cable in the first insulation displacement slot; and at least one stop member spaced from the at least one arm, the at least one stop member configured to abut one of the first and second opposed portions (50a, 50b) when the first and second opposed portions move away from each other in response to insertion of the electrical cable in the first insulation displacement slot, wherein the first insulation displacement slot is configured to receive the electrical cable such that first and second piercing members that at least partially define the first insulation displacement slot pierces an outer electrically insulative layer of the electrical cable and contacts an electrical conductor of the electrical cable that is disposed inside the electrically insulative layer, wherein the first arm comprises an outer region extending out with respect to the base, characterised in that the first arm further comprises an inner region that is disposed between the outer region and the second arm, and extends towards the base, such that the first arm defines a concavity facing the base. a base configured to be mounted onto a substrate so as to place the insulation displacement contact in electrical communication with the substrate; and a first arm and a second arm, that extend out with respect to the base, the first arm including first and second opposed portions (50a, 50b) that face each other so as to define a first insulation displacement slot there between, wherein the first and second opposed portions are configured to move away from each other in response to insertion of the electrical cable in the first insulation displacement slot; and at least one stop member spaced from the at least one arm, the at least one stop member configured to abut one of the first and second opposed portions (50a, 50b) when the first and second opposed portions move away from each other in response to insertion of the electrical cable in the first insulation displacement slot, wherein the first insulation displacement slot is configured to receive the electrical cable such that first and second piercing members that at least partially define the first insulation displacement slot pierces an outer electrically insulative layer of the electrical cable and contacts an electrical conductor of the electrical cable that is disposed inside the electrically insulative layer, wherein the first arm comprises an outer region extending out with respect to the base, characterised in that the first arm further comprises an inner region that is disposed between the outer region and the second arm, and extends towards the base, such that the first arm defines a concavity facing the base.