WITT CM 3 is a self-resetting cable monitoring device for the detection of cable errors. Between signal and triggering a time delay of 4.8 sec is integrated.
The device is used for the monitoring of the insulation of DC cable systems. It works without auxiliary power supply. The connection is made between the insulating outer shell and a reference ground. For the reporting, there are two potential free changeover contacts available. The device is integrated in a plastic housing that is made for the mounting on top-hat railways.
The voltage between a cable sheath and the earth is measured by a rectifier. If the voltage limit is exceeded a signalling relay is addressed. The circuit operates with the constant-current principle. This means that even after the voltage increases to more than 1000 V the demand for electricity is not increasing. The leakage current flowing to earth is dimensioned with only 2 mA. Only in cases of failure the current load will be increased to 6 mA. The state of switching is displayed locally by a signal lamp.
WITT Solutions GmbH is an owner-managed, medium-sized high-tech company that develops and sells measuring and testing technology for monitoring power supply and superstructure systems for rail-bound traffic.
The WITT EPM 4 measurement device monitors the potentials of the connected grounds and evaluates the occurring voltages.
The SAM device monitors the surge arrestor (SA) within a certain railway section and reports broken ones via an integrated GSM-Modem.
The WITT EPM 3 measurement device monitors the potentials of the connected grounds and evaluates the occurring voltages.
The WITT TVM 4 device monitors the driving voltage of individual sections and supplies information about the voltage values.
WITT CM 4 is a self-resetting cable monitoring device for the detection of cable errors., used for insulation monitoring of cable systems in DC Systems.
The WITT EscS 7 is an auto-resetting earth short-circuiting device that accords to EN 50122 regulations for the protection of public and infrastructure.
The WITT EscS 6 (EKS8) is an auto-resetting earth short-circuiting device after DIN VDE 0115 part 300 and part 320.
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