Abstract: A transmission device for the intrinsically safe transmission of data in an Ethernet network via a core pair of an Ethernet cable is disclosed. The transmission device includes a first sub-path connected to a first wire of the core pair of an Ethernet signal pair and a second sub-path connected to a second wire of the core pair of the Ethernet signal pair. Each sub-path comprises at least one current-limiting resistor and a common-mode rejection unit connected in series to the current-limiting resistor.

Abstract: A connecting device (27) has a first connection input (28), a second connection input (29), and a connection output (30). The two connection inputs (28, 29) are configured for connection to a bus coupling device (20, 21). The connection output is configured for connection to a subscriber (13). The first connection input (28) is connected without switches to the connection output (30) via a first connecting branch (31). The second connection input (29) is connected without switches to the connection output (30) via a second connecting branch (32). The connecting device (27) includes a diagnostic unit (39), which generates a diagnostic signal (D) depending on the first input voltage (U1) and/or the first input current (I1) at the first connection input (28) and/or on the second input voltage (U2) and/or the second input current (I2) at the second connection input (29).

Abstract: A connecting device (27) has a first connection input (28), a second connection input (29), and a connection output (30). The two connection inputs (28, 29) are configured for connection to a bus coupling device (20, 21). The connection output is configured for connection to a subscriber (13). The first connection input (28) is connected without switches to the connection output (30) via a first connecting branch (31). The second connection input (29) is connected without switches to the connection output (30) via a second connecting branch (32). The connecting device (27) includes a diagnostic unit (39), which generates a diagnostic signal (D) depending on the first input voltage (U1) and/or the first input current (I1) at the first connection input (28) and/or on the second input voltage (U2) and/or the second input current (12) at the second connection input (29).

Abstract: An explosion protected circuit board assembly that includes a circuit board having a carrier plate with conductive strips and at least one electrical component thereon. The circuit board assembly includes a housing part that defines a hollow space encasing the electronic component in intrinsically safe fashion while preventing flame transmission from the electrical component to the outside environment. In an alternative embodiment, housing parts defining hollow electrical component receiving spaces are mounted on opposite sides of the circuit board, with the components being electrically interconnected.

Abstract: A circuit arrangement includes a current measuring or temperature measuring device, used for triggering a shunt device. Said shunt device produces a short-circuit, which directly leads to the blowing of a fuse. The arrangement is modular and allows the operation of several current measuring devices on a common shunt device. Said arrangement is specifically adapted to prevent a protection resistor from warming up to too high a surface temperature in the case of an error, because the current is flowing for too much time.

Abstract: A circuit arrangement includes a current measuring or temperature measuring device, used for triggering a shunt device. Said shunt device produces a short-circuit, which directly leads to the blowing of a fuse. The arrangement is modular and allows the operation of several current measuring devices on a common shunt device. Said arrangement is specifically adapted to prevent a protection resistor from warming up to too high a surface temperature in the case of an error, because the current is flowing for too much time.