The ESC1000 is the latest development in our range of earth short circuiting devices. It is an automatically re-settable earth short-circuiter according to DIN EN 50522 for the protection of persons and infrastructure. As the only product available it fulfills the newest requirements of the norm DIN EN 50122-1 and DIN EN 50122-3.
The return current flowing through the rail generates a potential against earth through the electric resistance of the rail. This electric potential can be measured as a voltage between the rail or the carriage respectively and buildings and other infrastructure or earth. This voltage is potentially dangerous for persons. Because of that in DIN EN 50122 it is stipulated that this voltage has to be removed if it exceeds defined thresholds. This is facilitated by a temporary short circuit between rail and earth.
This means that it is not only monitoring DC and AC but also the interaction between the two voltages between the return conductor and the earth. The combination of thyristors arranged anti-parallel and a power contactor ensures a short switching period and high current carrying capacity. This device is built in an especially compact design.
The ESC1000 has been evaluated and licensed by the Eisenbahn – Bundesamt (Federal Railway Authority).
If the set voltage waveform is exceeded, the earthing short-circuiting device is activated, i.e. if the criteria of a closing operation are fulfilled, the thyristors are triggered and simultaneously the contactor is switched. The thyristors switch in a few milliseconds, the contactor closes in approx. 60 ms. When the thyristors have been triggered, the voltage collapses to a few volts. The thyristors remain triggered until the contactor has been closed, which is detected by way of the position of the auxiliary contacts of the contactor. Thereafter, the thyristors are turned off and the contactor takes over the load.
As a special function data from the ESC can be transmitted – e.g. to an operating center.
A range of variations for this product type is also available.
For further information please download the data sheet: