In the case of railways that are operated with direct current, the rail is used as a return conductor for the traction current. The rail is insulated from the ground, since stray currents that otherwise occur can cause corrosion on buildings and systems.
The return current flowing through the rail leads to a potential difference with respect to earth due to the electrical resistance of the rail. This potential difference can be tapped as a voltage between the rail or the vehicle and the structures or the earth. This voltage is potentially dangerous to people. Therefore, according to DIN EN 50122, these voltages are prescribed from a defined threshold value
dismantle. This happens via a temporary short circuit between the rails and the surrounding earth.
The WITT EscS 4 (EKS100) is an automatically resetting earthing short-circuiter according to EN 50122-1. The device can be parameterized. The voltage differences between return and
Earth are monitored. A power contactor guarantees a short switching time and a high current carrying capacity. This earthing short-circuiter has a particularly compact design. The WITT EscS 4 (EKS100) works according to the closed-circuit principle (normally closed).
If the entered voltage curve is exceeded, the earthing short-circuiter responds, i.e. the contactor is switched after the switch-on criteria have been met. The contactor has a closing time of approx. 18 ms. The main components of the WITT EscS 4 (EKS100) earthing short-circuiter are two-channel and have self-test functions.
The properties described under the tab “ Technical data ” also contain possible options that we offer for the product. If you are interested, please ask us.