RM Series

  • LED type 7 segment 4:digit display
  • 8 & 12 capacitors steps available in ON/OFF modes
  • Measurement ofA,V,PF, Cos Phi, W, Var, VA
  • Automatic calculation of C/k values
  • Program entry for targeted Cos phi value
  • No. of capacitors steps user definable
  • Automatic / Manual mode selection with indicator light
  • Over voltage, insufficient compensation
  • Over compensation state alarm indicator lights with output contact


  • Intelligent RM Series P.F. Controllers are used for measurement and control of P.F. control units for central reactive power compensation. The P.F. measured by Neptune RM Series is compared with the set values and in order to provide necessary compensation. P.F. Controller switches capacitor banks ON & OFF automatically. RM Series is Single Phase CT Sensing micro controller relay, designed for above application in 144×144 case for flush mounting with rear plug-in connectors. Microcontroller based programmable RM  series relays are manufactured with 8 & 12 capacitor steps. It can work either in automatic or manual mode.


  • Intelligent Switching for Balanced Load Compensation
  • Internal Temp. Control
  • Automatic Setup
  • Programmable discharge time
  • Automatic calculation of power values for each capacitor step

Auto / Manual mode selection

  • 10 different programs
  • C+ / NORMAL / C- condition light
  • Automatic calculation on C/k value
  • Insufficient compensation alarm
  • Over & Under compensation alarm

Programmable over voltage protection and alarm for capacitors

  • Automatic disconnection of all capacitor steps in case of Mains failure over 20 sec.
  • Programmable CT and PT ratio setting
  • Non-flammable enclosure

Electrical Parameters

Technical Data Parameters
 Operating Voltage (Un) 230 V AC +/- 10%,50/60Hz
 Operating Current 100mA-5.5 A
Capacitors Steps 8 &12
Network Type  Single CT,1 Phase
Accuracy Current 1% +/-1 digit(V,I Cos phi) and 2%+/-1 Digit(W,Var,VA)
Current Transformer Ratio 5……10000/5A
Power Consumption <2 VA(Current Circuit) and <3VA-10VA (Voltage Circuit)
Cos Phi setting 0.8< cosphi
C/k Setting 0.02-1.00
Time Delay Between Steps 1-1.800Sec( For Switch on/off Separately) Discharge Time(Reconnection time)-1-1.800Sec
Over Voltage Setting 230-275V AC
Output Contact 3A,750VA
Display RED LED,14 mm Height(144x144mm)
Dual Target Cos Phi (For Mains & Generator) YES
Automatic Energy Correction YES
Automatic Disconnection of Damaged Cap. Steps YES
Programmable THD-I and THD-V Alarm NO
Programmable Discharge Time YES
Programmable Over Voltage Alarm YES
Automatic Over Voltage Alarm YES
 Automatic Power Calculation YES
 Programmable Energy Ratio Alarm YES
Password Protection for Setup YES
RS 485 Communication NO
Alarm Contact OutPut Yes
Alarm Contact OutPut Yes
VLN Ph-Neutral Voltage Yes
VLL Ph -Ph Voltage Yes
Phase current Amperes Yes
Active Power KW Yes
Reactive Power Kvar Yes
Apparent Power KVA Yes
RM-8 and RM-12