ABB – B21 112‑100 (2CMA100150R1000) – Single‑Phase DIN‑Rail LCD Energy Meter

The ABB B21 112‑100 (2CMA100150R1000) is a compact, direct-connected, single-phase energy meter designed for DIN-rail mounting. With a backlit 6-digit LCD, RS‑485 Modbus communication, and programmable pulse output or alarm, it’s ideal for sub-metering, HVAC systems, and industrial energy monitoring. MID and IEC approved for Class B accuracy.  

 Key Features

• Model: B21 112‑100 (ABB P/N 2CMA100150R1000)

• Type: Single-phase DIN-rail active energy meter, direct-connected (no CTs)

• Current Range: 5 A nominal, up to 65 A max; starting current < 0.25 A  

• Voltage Range: 176–276 V AC (nominal 220–240 V), 50/60 Hz  

• Accuracy: Class 1.0 active energy (MID Class B, ±1%)  

• Display: 6-digit back-lit LCD with navigation buttons for browsing instruments, alarms, and logs  

• Outputs/Comm:

  • 1 configurable pulse/alarm output (S0 type)  

  • RS‑485 Modbus RTU (EQ-Bus compatible)  

• Metering & Alarms: Measures voltage, current, power, energy, frequency, power factor; 25 user alarms; event logging  

• Environmental Specs: –40 °C to +70 °C; IP20 housing (plastic); fire-resistant terminals  

• Standards: IEC 62052‑11, IEC 62053‑21, EN 50470‑1/3; MID 2004/22/EC certified  

• Physical Dimensions: 35 × 97 × 65 mm (2 DIN units); 0.15 kg  

• Connection Capacity: Main circuit: 1–25 mm²; comm: 0.5–1 mm²; torque: main 3 Nm, comm 0.25 Nm