A circuit interruption device comprising: at least one line side electrical contact and at least one respective stationary load side electrical contact, the electrical contacts (8, 12) disposed within a case; each of the line side contacts configured for engagement with the respective stationary load side contact, the engagement for electrically connecting an electrical supply with an electrical load; wherein the engagement comprises the at least one line side electrical contact and the at least one respective load side electrical contact moving through an arcing zone to make an electrical connection; characterized in that the circuit interruption device further comprises: a gate which includes a movable inner surface, wherein the movable inner surface 17 is configured to cooperate with the at least one line side electrical contact as the at least one line side electrical contact is moved in relation to the at least one respective load side electrical contact; at least one constriction feature in the arcing zone to form at least one constriction zone, wherein rotation of the gate causes the movable inner surface to rotate towards the at least one constriction feature to create the at least one constriction zone; and an expansion zone complementary to the at least one constriction zone, wherein the at least one line side electrical contact travels through the expansion zone and the at least one constriction zone before engagement with the at least one respective load side electrical contact. at least one line side electrical contact and at least one respective stationary load side electrical contact, the electrical contacts (8, 12) disposed within a case; each of the line side contacts configured for engagement with the respective stationary load side contact, the engagement for electrically connecting an electrical supply with an electrical load; wherein the engagement comprises the at least one line side electrical contact and the at least one respective load side electrical contact moving through an arcing zone to make an electrical connection; characterized in that the circuit interruption device further comprises: a gate which includes a movable inner surface, wherein the movable inner surface 17 is configured to cooperate with the at least one line side electrical contact as the at least one line side electrical contact is moved in relation to the at least one respective load side electrical contact; at least one constriction feature in the arcing zone to form at least one constriction zone, wherein rotation of the gate causes the movable inner surface to rotate towards the at least one constriction feature to create the at least one constriction zone; and an expansion zone complementary to the at least one constriction zone, wherein the at least one line side electrical contact travels through the expansion zone and the at least one constriction zone before engagement with the at least one respective load side electrical contact. a gate which includes a movable inner surface, wherein the movable inner surface 17 is configured to cooperate with the at least one line side electrical contact as the at least one line side electrical contact is moved in relation to the at least one respective load side electrical contact; at least one constriction feature in the arcing zone to form at least one constriction zone, wherein rotation of the gate causes the movable inner surface to rotate towards the at least one constriction feature to create the at least one constriction zone; and an expansion zone complementary to the at least one constriction zone, wherein the at least one line side electrical contact travels through the expansion zone and the at least one constriction zone before engagement with the at least one respective load side electrical contact.