Liner arrangement and a circuit breaker with a liner arrangement and method for protecting an insulator body

A circuit breaker comprising:

• a heating chamber insulator comprising a tubular insulator body;
• a liner arrangement adapted for fitting the tubular insulator body in the circuit breaker, the liner arrangement comprising:
• a planar, electric-arc resistant and heat resistant liner layer comprising a first edge portion and a second edge portion that is located opposite the first edge portion,
• wherein the first edge portion and the second edge portion extend in a longitudinal direction of the planar liner layer,
• wherein the first edge portion has a first contour, and
• wherein the second edge portion has a second contour having a geometry that is complementary to the first contour such that the first edge portion can be attached by way of a form fit to the second edge portion once the planar liner layer is bent to a tubular shape;
• and
• wherein the liner arrangement is attached to the tubular insulator body.

A method for protecting a tubular insulator body of a heat chamber insulator for a circuit breaker from heat by a liner arrangement, the method comprising:

• connecting a first edge portion of a liner layer having a first contour and a second edge portion of the liner layer having a second contour being complementary to the first contour by form fitting the first edge portion and the second edge portion together to form a substantially tubular cylindrical liner arrangement,
• wherein the first edge portion and the second edge portion extend in a longitudinal direction of the planar liner layer, and
• wherein the liner layer comprises a material capable of protecting the insulator body from the heat generatable by an electric arc in the cavity of the tubular insulator body;
• and
• forming an insulator body for a circuit breaker around the tubular liner arrangement.