Siemens Aktiengesellschaft

Manfred Kleemeier

Reinhard Schmid

Reinhard Solleder

Fritz Pohl

Bernhard Bauer

Jean-Mary Martel

Johann Herrmann

Manfred Adlhoch

Gerald Lehner

Hans-Jürgen Huber

Christian Albrecht

Harald Heil

A residual current device ( ), having a residual current tripping circuit ( ) which is independent of the mains voltage and contains a core balance transformer ( ), and having overload protection ( ) arranged in an overload tripping circuit ( ) which is supplied with the mains current, wherein the residual current tripping circuit ( ) and the overload tripping circuit ( ) contain a common tripping relay ( ) for operating a switching mechanism ( ) which switches a conductor network (LN).

Fault-current protection device with an overload protection device

Two detection systems are provided for a protective device, in particular an FI protective device, having a core balance transformer whose secondary winding is followed by a tripping relay for operating a switching mechanism, which switches a conductor network. In this case, a first detection system carries out the tripping function for fault currents at a fault current frequency below a changeover frequency. The second detection system carries out the tripping function for fault currents above the changeover frequency. The changeover frequency is in this case preferably not less than 1 kHz.

Protective device, in particular a fault current protective device

A protective device against fault currents includes a triggering arrangement for performing at least the functions of detecting a fault current and/or triggering power-down of the network to be protected. The triggering arrangement, outside the most strict quartic curve (A), corresponds to the protection of persons in case of indirect contact, and below the triggering quartic curve (B), corresponds to protection against fire. The triggering quartic curve (B) satisfies the relationship: I (f)/I &equals;F(f)&equals;B&equals;const., wherein I (f)&equals;W /U . In the relationships, I (f) represents the limit fault current permissible for the corresponding frequency, where there is still no risk of fire; I represents the nominal triggering fault current at the frequency of the network taking into consideration the protection of persons; W represents the power limit in watt required for protection against fire; U represents the network voltage to be protected and F(f) represents what is called the frequency factor.

Protective device against fault currents for protection against fire

A residual current device includes a residual current tripping circuit for actuating a release, and an additional monitoring device for checking the release, in which case a device is provided for electrically decoupling the residual current tripping circuit from the monitoring device.

Fault-current protective switchgear

Socket-outlet

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Neutraubling, Germany

Manfred Kleemeier