Device for disconnecting an electrical circuit

A device comprising:

• a contact mechanism comprising:
• a first conductor configured to be coupled to an external electrical circuit;
• a second conductor configured to be coupled to the external electrical circuit;
• a moveable contact;
• and
• an actuating mechanism configured to move the moveable contact between a first, closed, position in which a current conduction path is defined through the first, second and moveable conductors of the contact mechanism and a second, open, position in which no current conduction path is defined;
• an actuation knob comprising:
• a first side comprising a cam portion that directly engages with the actuating mechanism to drive the actuating mechanism upon rotation of the actuation knob to move the moveable contact;
• a second side opposite the first side;
• and
• an engagement portion protruding from the second side and configured for engagement by a user;
• and
• a housing enclosing both the contact mechanism and the first side of the actuation knob, the engagement portion configured to protrude through an opening in the housing, wherein the actuation knob is configured to rotate within the housing in response to engagement by a user and wherein the housing is configured to extend across at least a planar portion of the second side of the actuation knob to retain the actuation knob within the housing.