Meba din rail power meters MB021AC  is a kind of new style three phase four wire electronic active energy meter, it adopt micro-electronics technique, and imported large scale integrate circuit, use advanced technique of digital and SMT techniques, etc. It has its completely independent intellectual property rights and minimum size, and also a new three phase four wire active energy meter. 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. This meter has white backlight source eight digits LCD displays shows the active energy consumption. It has following features: good reliability, small volume, light weight, specious nice appearance, convenient installation, etc. The patent certificate of this meter is in assessing in the China State Intellectual Property Office at present.

Technical Data

Model Accuracy Reference Voltage(V) Current specifications(A) Starting current(A) Insulation performance
MB021AC Class 1 3X127/220
CT/5A 0.01 [button color=”#COLOR_CODE” background=”#COLOR_CODE” size=”medium” src=”PLACE_LINK_HERE”]ADD_BUTTON_CONTENT[/button]

Installing Diagram


Dimension for MB021AC
Dimension for MB021AC

Wiring Diagram

Wiring Diagram for MB021AC
Wiring Diagram for MB021AC


Terminal Note Terminal Note
L1 L1 phase CT 9 L1 phase line
L2 L2 phase CT 11 L2 phase line
L3 L3 phase CT 13 L3 phase line
(Inlet from bottom, outlet from top) N Neutral line
7 and 8 Port of pulse output passive closed 5 and 6 Port of RS485 data communication
3 and 4 Port of pulse output passive distant 1 and 2 Port of CT ratio which is set

1. 35mm standard DIN rail installation, complying with standard DIN EN50022. Or front board installed (mounting holes center distance 63 mm), users can choose any one by themselves.
2. Ten pole width (Modulus 12.5mm), complying with standard JB/T7121-1993.
3. Type S wiring (Inlet from bottom, outlet from top), use CT connect operation, may select set 27 ratio, after set the meter will direct reading when read, and haven’t multiplied by rate of CT.
4. 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. 5. 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.
6. 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)
7. Six LED instructions respectively every power supply state, signal of closed energy impulse and distant energy impulse and data communication state.
8. Automatic detection the direction of the flow of load current. And Instructions on individual LCD.
9. 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.
10. Standard configuration short terminals cover, may select extension terminals cover, in order to protect to use safety. (Product Configuration code is AF).

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