Disconnection and switch-over device for overvoltage protection, particularly for DC systems

A disconnection and switch-over device for overvoltage protection, particularly for DC systems, having at least one arresting element and furthermore a thermal cut-off point (1), wherein the thermal cut-off point (1) comprises a movable conductor element (2) which is under mechanical prestress and moves from a first position into a second position in the event of a cut-off, wherein, when the second position is reached, an electrical switchover to a safety device (4) is generated, the thermal cut-off point (1) is formed by the movable conductor element (2) and a stationary contact element, wherein the movable conductor element (2) is attached to the stationary contact element by a thermally releasable means, characterized in that

• a complete electrical cut-off of an arresting element (5) regarding the interconnect path is only given when the movable conductor element (2) has gone beyond the second position and has reached a third position, wherein the safety device (4) is arranged in series to the arresting element (5) and the movable conductor element (2) is designed as a wiper or sliding contact in relation to the second position, wherein the second position is realized by a bypass end point (3), characterized in that
• the movable conductor portion (2) does not touch the bypass end point (3) upon reaching the second position but draws an electric arc (8), which causes the safety device (4) to respond.