Arrangement for overload protection for overvoltage protection equipment

An arrangement for overload protection of overvoltage protection devices comprising at least one voltage-limiting element (H) and at least one voltage-switching element (B) as well as a series fuse (I), wherein the voltage-limiting element is designed as a varistor (H) and the voltage-switching element is designed as at least one of a spark gap (B) and a gas arrester and these elements are connected in series,

• characterized in that
• to protect the voltage-limiting element (H), a monitoring spark gap or a monitoring gas arrester (A) forming a bypass is connected in parallel in the series connection and a monitoring device (C) is further provided which, upon the effects of aging, inadmissibly high main system voltages and/or low-energy, periodic, high-frequency pulses, bypasses either only the monitoring spark gap or monitoring gas arrester (A) respectively or the monitoring spark gap or monitoring gas arrester (A) and the voltage-switching element (B) subject to the counter-voltage of the voltage-switching element,
• wherein same is formed on a circuit board (1) which accommodates the voltage-limiting (2) as well as the voltage-switching element (3), the series fuse (4), the monitoring spark gap or monitoring gas arrester and the thermal monitoring device,
• wherein the thermal monitoring device is a solder preform (5) disposed in heat-transferring proximity to the gas discharge arrester (3), wherein a spring-loaded clip which triggers or effects the monitoring function is released by the melting preform (5),
• wherein a wrap spring (7) is provided which produces the desired preload force and simultaneously constitutes a conductive part of the bypass, and
• wherein the wrap spring (7) comprises two spring ends (8 and 9), wherein a first spring end (8) rests and/or is supported on the circuit board and a second spring end (9) on the solder preform (5) and the wrap body (10) of the wrap spring (7) is fixed on the series fuse (4) and in electrical contact with same.

An arrangement for overload protection of overvoltage protection devices comprising at least one voltage-limiting element (H) and at least one voltage-switching element (B) as well as a series fuse (I), wherein the voltage-limiting element is designed as a varistor (H) and the voltage-switching element is designed as at least one of a spark gap (B) and a gas arrester and these elements are connected in series,

• characterized in that
• to protect the voltage-limiting element (H), a monitoring spark gap or a monitoring gas arrester (A) forming a bypass is connected in parallel in the series connection and a monitoring device (C) is further provided which, upon the effects of aging, inadmissibly high main system voltages and/or low-energy, periodic, high-frequency pulses, bypasses either only the monitoring spark gap or monitoring gas arrester (A) respectively or the monitoring spark gap or monitoring gas arrester (A) and the voltage-switching element (B) subject to the counter-voltage of the voltage-switching element,
• wherein same is formed on a circuit board (1) which accommodates the voltage-limiting (2) as well as the voltage-switching element (3), the series fuse (4), the monitoring spark gap or monitoring gas arrester and the thermal monitoring device,
• wherein a slider (6) strikes the gas discharge arrester (3) and its solder mounting on the circuit board which triggers or effects the monitoring function upon the melting of the solder mounting,
• wherein a wrap spring (7) is provided which produces the desired preload force and simultaneously constitutes a conductive part of the bypass, and
• wherein the wrap spring (7) comprises two spring ends (8 and 9), wherein a first spring end (8) rests and/or is supported on the circuit board and a second spring end (9) on the slider (6) and the wrap body (10) of the wrap spring (7) is fixed on the series fuse (4) and in electrical contact with same.