25 Year OEM,ODM$OBM Special Circuit Break Manufactory In China
  jack_yuanky          jack_yuanky
Fax: 0086-577-62652370
Tel: 0086-577-62652939



Model EM321AC three phase four wire electronic front board installed active energy meter is a kind of new style three phase four wire active energy meter, it adopt micro-electronics technique, and imported large scale integrate circuit, use advanced technique of digital and SMT techniques, etc. The meter completely accord with relevant technical requirements of class 1 three phase active energy meter stipulated in international standard IEC 62053-21. It can accurate and directly measure 50Hz or 60Hz active energy consumption from three phase four wire AC electricity net, it is use for setting indoor or out door, and this meter has seven digits LCD displays shows the active energy consumption. And there are far infrared and RS485 communication module in it. Contact with all kind of AMR system conveniently. It has following features: good reliability, small volume, light weight, specious nice appearance, convenient installation, etc.

Functions and features
● Front board three fixed installation, up and down mounting holes center distance is 198-212 mm, users can choose any one by themselves.
● Type 48b wiring, 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 nonpolarity 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 agreement complying with standard DL/T645-1997, can also choose without function of data communication. (Product Configuration code is NC).
● Six LED instructions respectively power supply state, signal of closed energy impulse and distant energy impulse and data communication state.
● Automatic detection the direction of the flow of load current. And instructions by individual LED.
● Single direction three components measure three phase four wire active energy consumption. It is nothing with direction of the flow of load current. Complying with standard IEC 62053-21.
● Standard configuration short terminals cover, may select extension terminals cover, in order to protect to use safety. (Product Configuration code is AF).

Technical parameters



voltage (V)

specifications (A)

current (A)



Class 1

3 X 127 / 220
3 X 230 / 400

CT/ 5A


AC voltage 4kV for 1 minute,
1.2/50us waveform
impulse voltage 6kV

*If you need different reference voltage or current specification, please advisory our sales.

Outer and mount dimension

Wiring diagram (Type 48B)



1 Inlet L1 phase CT
3 Outgoing L1 phase CT
4 Inlet L2 phase CT
6 Outgoing L2 phase CT
7 Inlet L3 phase CT
9 Outgoing L3 phase CT
2 L1 phase line
5 L2 phase line
8 L3 phase line
10 Neutral line
14 and 15 Port of CT ratio which is set
16 and 17 Port of RS485 data communication
18 and 19 Port of pulse output passive closed
20 and 21 Port of pulse output passive distant