Contactor

A contactor comprising:

• a first contact member, wherein the first contact member is fixed and connected to a first conductor of an electrical circuit;
• a second contact member, wherein the second contact member is connected to a second conductor of the electrical circuit by a connector and wherein the second contact member moves between a break position, in which the first and second contact members are out of contact, and a make position, in which the first and second contact members are in contact;
• an actuator assembly, wherein the actuator assembly is coupled to the second contact member such that actuation of the actuator assembly translates into movement of the second contact member;
• an electromagnetic arrangement comprising an electromagnetic coil and at least a part of the actuator assembly, wherein, when the coil is energized, the coil generates a magnetic field and thereby the actuation assembly is caused to move under the influence of the magnetic field, which in turn causes the second contact member to move;
• an enclosure, wherein the enclosure is hermetically sealable, wherein the first and second contact members, the connector, and the actuation assembly are inside the enclosure;
• and
• wherein the coil is outside the enclosure;
• and
• wherein the actuator assembly comprises a piston movable within the enclosure and having a magnetic element that is in electromagnetic communication with the coil and spaced from the second contact member by the piston coupled to the second contact member.