Phase monitor
RK 9872

The space saving phase monitor RK9872/800 from the Varimeter family monitors under- and overvoltage as well as phase sequence in 3-phase systems. The response values are fixed. When connecting the measuring voltage to the inputs L1-L2-L3 and fault free system the relay switches on. When the measuring voltage is connected the unit checks a clockwise phase sequence. If this is not the case the yellow LED flashes. The output relay will not energise. After detection of under- or overvoltage on one or more phases for more the 5 sec. the relay switches off. The relay stays off for at least 2 seconds. The phase monitor measures the arithmetic mean value of the 3 phases against neutral.

Advantages
. Reliability monitoring of 3- or 1-phase voltage systems on:
- Undervoltage
- Overvoltage
- Phase sequence (at 3-phase voltage system)
. Fast fault location
. Preventive maintenance
. Space saving

Features
. According to IEC/EN 60255-1
. Detection of under-/overvoltage and phase sequence in 3-phase voltage systems
. Without separate auxiliary voltage
. LED-Indication for operation voltage and contact position
. De-energized on trip
. With fixed response value for undervoltage
. With fixed response value for overvoltage
. Width: 17,5 mm

Technical specifications
Width: 17,5mm
Enclosure design: Distribution board
1- / 3-phase: 3
Standard measuring range: 3/N AC 400/230 V
Measuring range max.: 400 V
Output contacts: 1 C/O contact
Type: RK 9872


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: RK9872.11 3/N AC400/230V 50/60HZ
Art. No.: 0065075