Function:

Auto Changeover relays are designed to changeover the source of supply to load where more than one source is available. These are required to changeover load from mains to DG, different phases of mains and mains to UPS systems etc.

   For different applications, we have specific models. There are with load 
   limiter, without load limiter, and many additional functions.

   PLCR-P-1-20 is  designed for Portable Generators. It transfers the load from  
   generator to Mains on resumption of Mains. It is two pole changeover with
   loading capacity is 10 Amps max.
                                         
   PLCR-P-2-20 is similar to PLCR-O-20 with addition of facility to stop the
   portable set on resumption of mains

   PLCR-DS-25/60 are auto changeover with load limiter. In a multistoried
   building or in a shopping complex  where one generator supplies load to many
   apartments/ shops, it is  essential to limit load drawn by individual users during
   generator operation. If the load exceeds the set level, it trips the supply. After
   30 Sec. It re-starts and checks. If the load is within the limit, it remains study.
   In case of still over load, it again trips. This gives the user freedom of using
   the assigned load any where in his apartment. During Mains On there is no
   load limiting. PLCR-DS-25 is for loads up to 25 Amps and PLCR-DS-60 is for
   loads up to 60 Amps.
                                    
  PLCR-DT-15/25/45 are auto changeover for three phase  load.  Similar to PLCR-
  DS- series, it limits load drawn during DG operation. During mains ON no limit is
  applied. 15/25/45 indicates nominal capacity during mains. These are Three
  pole devices and Neutral is not isolated.

  Series PLCR-DTN. Are with four pole changeover which allows for Neutral to be
  isolated.

  PLCR-LT-25/60 are for single phase loads with availability of 3  phase
  systems. Electricity supply  at all important installations like  HOSPITALS,  
  PUBLIC PLACES, VIP CHAMBERS, AIRPORTS, RAILWAY STATIONS, OFFICES,  
  Computer installations etc is to be kept ON with minimum disturbances. It is
  desired to at least keep the lighting load (essential Load) ON even during failure
  of one or two phases. In case of failure of one phase,  it shifts the load to
  other phase or UPS automatically.  The system has built in MCB for incoming
  supply. During MAINS ON load is distributed on the phases as per the original
  wiring.