Voltage Indicator, Type HR-ST, is the mobile section of a voltage testing system (VDS) in accordance with E DIN VDE 0682 Section 415 (IEC 61243-5), which is hooked up to active parts single-pole capacitively.
It is used to determine lack of voltage as per VDE 0105 Section 1 and is designed for high-resistance systems (HR systems), in which the indicator threshold features, at the interface, a voltage of 90 V and current of 2.5 µA at 50 Hz.
Voltage is indicated by a flashing LED. The voltage indicator does not have its own power supply (battery).
The display - and the unit’s overall functions - can be tested with a functional tester.