Electrical contact sets

An electrical contactor comprising:

• a first terminal having at least one first fixed electrical contact;
• a second terminal having at least one second fixed electrical contact;
• a first electrically-conductive movable arm in electrical communication with the first terminal and having at least one first movable electrical contact thereon;
• a second electrically-conductive movable arm in electrical communication with the second terminal and having at least one second movable electrical contact thereon, counter-opposed to the first electrically-conductive moveable arm;
• a third terminal having a third fixed member with at least one third fixed electrical contact;
• a fourth terminal having a fourth fixed member with at least one fourth fixed electrical contact;
• a third electrically-conductive movable arm in electrical communication with the third terminal and having at least one third movable electrical contact thereon;
• a fourth electrically-conductive movable arm in electrical communication with the fourth terminal and having at least one fourth movable electrical contact thereon, counter-opposed to the third electrically-conductive moveable arm;
• and
• an actuator providing motive force to the first and second electrically-conductive moveable arms in opposing directions, and to the third and fourth electrically-conductive moveable arms in opposing directions,
• wherein the or each first moveable electrical contact and the or each second fixed contact form a primary contact set, and the or each second moveable electrical contact and the or each first fixed contact form a secondary contact set, counter-opposed first and second moveable arms thereby forming a current-sharing arm pair between first and second terminals;
• wherein the current through the counter-opposed first and second moveable arms flows in the same direction, thereby creating an attractive magnetic force between the first and second moveable arms;
• wherein the or each third moveable electrical contact and the or each fourth fixed contact form a tertiary contact set, and the or each fourth moveable electrical contact and the or each third fixed contact form a quaternary contact set, third and fourth moveable arms thereby forming a further current-sharing arm pair between third and fourth terminals;
• wherein the current through the counter-opposed third and fourth moveable arms flows in the same direction, thereby creating an attractive magnetic force between the third and fourth moveable arms,
• wherein the current flow through the counter-opposed third and fourth moveable arms flows parallel and in opposition to the current flow through the first and second moveable arms, and
• wherein a repulsive magnetic force is created between the second and fourth moveable arms as a result of the parallel and opposite current flow between the current-sharing arm pair, and the further current-sharing arm pair.