CONTACT PROTECTION CIRCUIT AND HIGH VOLTAGE RELAY COMPRISING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a switching device having a contact protection circuit for an arc suppression circuit.

SOLUTION: A switching device 1 comprises: a main switching mechanism 120 comprising a main switch 110 for electrically interrupting a flow of current flows through a load path 100; an auxiliary switching mechanism 150 comprising an auxiliary switch 140; and a PTC device 180 connected with the auxiliary switch 140 in a series arrangement. The series arrangement is connected in parallel to the main switch 110. The auxiliary switching mechanism 150 is adapted to maintain the auxiliary switch 140 to be at a closed position during a given time interval after the main switch 110 is operated to be at an open position. The given time interval depends on a transition of the PTC device 180 from a low resistance state to a high resistance state.

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