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Power & Multifunction Meters

ABB B21 ENERGY METER 'SILVER', MODBUS RS485, SINGLE-PHASE, 5A B21-312-100

Product Code: B21-312-100

The B21-312 energy meter is a 65A direct connect, single-phase meter designed for use with 230VAC power supply. It features pulse output and Modbus RTU communication for easy data transfer. With an accuracy class of 1, it provides precise measurements within the range of 220-240V between the neutral and live wires. The meter has a compact design with an IP20 protection degree and a backlit LCD display for clear visibility. It belongs to the Silver functionality sub-group, offering various features such as active, reactive, and apparent energy measurement, import/export of energy, resettable energy registers, and support for Class 0.5 or Class 1 accuracy. Additionally, it supports tariffs, fixed I/O connections, active energy monitoring, and pulse output/alarm functionality. The meter is two modules wide and can be easily mounted on a DIN rail.

Technical Specifications

Accuracy Class Active Energy Class B MID
I/O Option 2 digital output, 2 digital input
Meter Type Direct connected
Net Weight (g) 150
No. of Digital Inputs 2
No. of Digital Outputs 2
Number of Counter Positions 7
Output Type Pulse
Power Loss (VA) 16
Pulse Output Rate 1-999999
Realtime Clock 26
Sub-Function Silver
Brand ABB
Accuracy ±1%
Communication Modbus RTU
Communication Interface Modbus RS485
Connection Type Direct
Current Rating (A) 5
Degree of Protection IP20
Dimensions (mm) 35 X 26.5 X 65
Display Screen Type Digital
Enclosure Material Polycarbonate in transparent front glass. Glass reinforced polycarbonate in bottom case and upper case. Polycarbonate in terminal cover.
Function Electricity meter
Mounting Type DIN-Rail
No. of Phases Single-phase
No. of Poles 1P
Power Consumption (W) 0.414
Rated Current (A) 5 Maximum 65
Rated Frequency (Hz) 50 / 60
Rated Voltage (V) 220-240
Rated Voltage AC (V) 230
Width in Number of Modular Spacings 2

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