Safety switching device with failsafe inputs

A safety switching device for shutting down a technical installation in a failsafe manner comprising:

• a first input channel for receiving a first input signal,
• a second input channel for receiving a second input signal, and
• a first testing arrangement for testing the first and second input channels;
• wherein the first input channel comprises a first entry circuit, a first threshold element, a first coupling element, a second testing arrangement and a first transition circuit,
• wherein the second input channel comprises a second entry circuit, a second threshold element, a second coupling element, a third testing arrangement and a second transition circuit,
• wherein the first testing arrangement comprises a third coupling element, a ground terminal, and a group testing terminal,
• wherein the first entry circuit and the first threshold element are connected via the first coupling element with the second testing arrangement and the first transition circuit in a galvanically isolated manner,
• wherein the second entry circuit and the second threshold element are connected via the second coupling element with the third testing arrangement and the second transition circuit in a galvanically isolated manner,
• wherein the first threshold element, the second threshold element and the ground terminal are connected via the third coupling element to the group testing terminal in a galvanically isolated manner, and
• wherein the third coupling element is configured to connect the first threshold element and the second threshold element to the ground terminal.