Function and features:

--Front board three fixed holes installation, up and down mounting holes center distance 
   is198-212 mm, users can choose any one by themselves.
--Type 48b connection, use CT connect operation, may select set 27 ratio of CT, after set the 
   meter will direct reading when read, and haven’t multiplied by rate of CT.
--Seven digits display LCD, 5+2 digits display (99999.91 kWh, only ratio of CT when 5:5 A) or 
   7digits, it is choose by ratio of CT which is set.
--There are a polarity port of pulse output passive closed and a no polarity port of pulse 
   output passive distant (the output rate is 10 KWh/pulse). Complying with standard IEC 
   62053-31 and DIN 43864.
--Standard configuration there are a port of far infrared data communication and a port of 
   RS485 data communication.
--Communication protelot complying with standard DL/T645-1997, can also choose without 
   function of data communication. (Product Configuration code is NC).
--Six LED instructions respectively power state, signal of closed power impulse and distant 
   power impulse and data communication state.
--Automatic Detect the direction of the trend of load current. And instructions by individual 
   LED.
--Single direction three components measure three phase four wire active Power 
   consumption. It is nothing with direction of the trend of load current. Complying with 
   standard IEC 62053-21.
--Standard configuration extended terminals cover, may select short terminals cover, in 
   order to protect to use electricity safely. (Product Configuration code is AF).

DEM321AC Three phase Four  wire electronic Front board Installed Active Energy Meter Technical parameters:

DEM321AC Three phase Four  wire electronic Front board Installed Active Energy Meter Outer and mount dimension:

DEM321AC Three phase Four  wire electronic Front board Installed Active Energy Meter  Wiring diagram(Type 48B)