7
2. Function
2.1 Device features
Suitable for electric vehicle charging stations
AC/DC sensitive measured value acquisition 0…500 Hz
Internal measuring current transformer with test winding and screening for electrical interfer-
ence field reduction, inside diameter 15 mm
Measuring range 0…30 mA, with analogue output voltage
Switching signal at the output according to the requirements of IEC 60755
Latch locks at the measuring current transformer allow easy installation of the module
Monitoring of the connection to the measuring current transformer
Reset via control input X10
2.2 Description of function
The residual current monitoring module detects the residual current caused by leakage and residual
currents in the conductors passed through the measuring current transformer. The residual current
monitoring module measures AC and DC currents. The r.m.s. value is determined by the DC
components included in the residual current and by AC components which are below 500 Hz.
A signal in proportion to the r.m.s value is provided across the voltage output X1. The second output
(X12) provides a switching signal when values are outside the permissible measuring range or in
case of high or soaring residual currents.
The control input (X10) will also be queried. Depending on the sequence of the HIGH/LOW levels
applied, the RCMB102 can be reset with or without a self test, calibration and activation of the test
winding (test current supply).
