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ABB B21 Electricity meter, M-Bus

ABB B21 is a single phase compact electricity meter. It is equipped with a backlit display that provides information about active effect, current, voltage, power factor and frequency. By using ABB B21 together with Elvacos external Meter Connectivity Modules CMeX20 or CMeX20W, meter data can be converted to M-Bus/Wireless M-Bus and delivered to a receiving system.


Electrical connections

Electrical characteristics

Environmental specifications

Temperature sensor, margin of error

Humidity sensor, margin of error

User interface


Wireless M-Bus

Integrated M-Bus Master

Wireless M-Bus Receiver

M-Bus slave interface


Data storage (examples)

Mobile Network

Fixed Network (Ethernet)



Connections and Interfaces


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