Three-position disconnector switch

A three-position disconnector switch, comprising:

• an earthing contact;
• a power out contact;
• a power in contact;
• a piston;
• and
• a threaded rod,
• wherein:
• a length of the piston is such that in a first switch position an outer surface of a wall of the piston makes an electrical contact between the power out contact and the power in contact,
• the length of the piston is such that in a second switch position the outer surface of the wall of the piston does not make an electrical contact with either the earthing contact or the power in contact,
• the length of the piston is such that in a third switch position the outer surface of the wall of the piston makes an electrical contact between the earthing contact and the power out contact,
• the piston comprises an inner threaded section configured to engage with the threaded rod, wherein a length of the inner threaded section is less than the length of the piston,
• rotation of the threaded rod is configured to engage with the inner threaded section to move the switch between the different switch positions, and
• the earthing contact comprises one or more holes extending through an outer wall of the earthing contact in a substantially radial direction.

A three-position disconnector switch, comprising:

• an earthing contact;
• a power out contact;
• a power in contact;
• a piston;
• and
• a threaded rod,
• wherein:
• a length of the piston is such that in a first switch position an outer surface of a wall of the piston makes an electrical contact between the power out contact and the power in contact,
• the length of the piston is such that in a second switch position the outer surface of the wall of the piston does not make an electrical contact with either the earthing contact or the power in contact,
• the length of the piston is such that in a third switch position the outer surface of the wall of the piston makes an electrical contact between the earthing contact and the power out contact,
• the piston comprises an inner threaded section configured to engage with the threaded rod, wherein a length of the inner threaded section is less than the length of the piston,
• rotation of the threaded rod is configured to engage with the inner threaded section to move the switch between the different switch positions, and
• the power out contact comprises one or more holes extending through an outer wall of the power out contact in a substantially radial direction.

A three-position disconnector switch, comprising:

• an earthing contact;
• a power out contact;
• a power in contact;
• a piston;
• and
• a threaded rod,
• wherein:
• a length of the piston is such that in a first switch position an outer surface of a wall of the piston makes an electrical contact between the power out contact and the power in contact,
• the length of the piston is such that in a second switch position the outer surface of the wall of the piston does not make an electrical contact with either the earthing contact or the power in contact,
• the length of the piston is such that in a third switch position the outer surface of the wall of the piston makes an electrical contact between the earthing contact and the power out contact,
• the piston comprises an inner threaded section configured to engage with the threaded rod, wherein a length of the inner threaded section is less than the length of the piston,
• rotation of the threaded rod is configured to engage with the inner threaded section to move the switch between the different switch positions, and
• the power out and/or the power in contact comprises one or more holes extending through an outer wall of the power contact in a substantially radial direction.