ABB – B21 312‑100 (2CMA100155R1000) – 1‑Phase Direct‑Connected Energy Meter, 65A

Main Features

• Manufacturer & Model: ABB B21 312‑100, internal code 2CMA100155R1000  

• Measurement Type: Single-phase direct‑connected meter for currents up to 65 A  

• Accuracy: Class 1 for active energy (or Class B under MID), Class 2 for reactive energy  

• Display & Readings: 7-digit backlit LCD displaying active/reactive energy (import/export), power, current, voltage, frequency, power factor, apparent power  

• Tariffs & Counters:

  • Supports intermediate counters, up to 4 tariffs

  • Built-in real-time clock  

• Inputs & Outputs:

  • 2 general-purpose inputs and 2 outputs — configurable as pulse outputs (energy) or alarm outputs

  • Up to 25 alarm thresholds with time delays  

• Communication:

  • RS‑485 with Modbus RTU/EQ‑Bus

  • Infrared interface for optional KNX connection  

• Standards & Certification: IEC 62052‑11/-53‑21/-53‑23, EN 50470‑1/-3; MID‑approved  

• Physical Specs:

  • DIN‑rail, 2 TE width (35 mm), IP20; compact housing (97×35×65 mm), weight ~0.15 kg  

  • Operating –40 °C to +70 °C  

• Pulse Output: Programmable rate (1–9999 imp/kWh/min/Wh), pulse width 10–990 ms