FIELD: electricity.
SUBSTANCE: overvoltage protection device has housing (1) and at least two electric conductors (2) led to housing (1) or electric connection to the overvoltage protection device, thermal switch (14), spark discharger (15) and igniter (16). In housing (1) there located is overvoltage protection discharger (3) to restrict overvoltage of electric conductors (2), as well as switch (4) responding to pressure for short-circuiting of electric conductors (2). Thermal switch (14) is connected thermally to discharger (3) for protection against overvoltage and made so that it can ignite spark discharger (15) by means of igniter (16).
EFFECT: possible reliable and safe cutoff of fault current by short-circuiting electric conductors even in case of a failed spark discharger for overvoltage protection, when an arc appears in the housing.
15 cl, 5 dwg
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