| 摘要 |
This circuit breaker has a cylindrically designed arcing chamber (1), filled with an insulant medium, which has a power current path, arranged in an insulant housing (12) and stretched along a longitudinal axis (2), with a fixed contact arrangement (3) arranged in the power current path, and with a contact arrangement (5) having a moving contact cage (8), both the fixed contact arrangement (3) and the contact arrangement (5) each being provided with a fixed erosion-resistant covering (7, 10). In addition, a blast volume which accumulates the increased pressure of the insulant medium which occurs during a breaking process is provided. The invention is to provide a circuit breaker in which the contact erosion is reduced by simple means. This is achieved in that in the on position, the contact cage (8) surrounds a guide part (4) designed to be electrically insulant, and in that the insulant housing (12) has a shoulder (13) which projects into the region between a first covering (7) and a second covering (10), and in that the two erosion-resistant coverings (7, 10) are arranged concentrically around the region of the moving contact cage (8).
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