FIELD: electricity.
SUBSTANCE: overvoltage protection device (1) comprises a voltage surge limiter (2) and a disconnecting device (3) with electric contacts (4, 6). The disconnecting device comprises the first connecting electrode (40), electrically connected with the first contact site (41), the second connecting electrode (50), electrically connected with the second contact site (51), and the third switching electrode (60), electrically connected with the second contact site (51). The actuating mechanism (7) moves the third electrode (60) for forced execution of permanent opening of electric contacts (4, 6). The protection device comprises a disconnector (9) from short-circuit currents connected in series between the third electrode (60) and the second contact site (51). The disconnector is switched off from the circuit, when the electric arc (100) is thrown over between the first connecting electrode (40) and the second connecting electrode (50).
EFFECT: improved efficiency of short-circuit protection.
16 cl, 11 dwg
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|---|---|---|---|
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