Main Features

Manufacturer & Model: ABB B ‑, internal code CMAR
Measurement Type: Single-phase direct‑connected meter for currents up to  A
Accuracy: Class  for active energy (or Class B under MID), Class  for reactive energy
Display & Readings: -digit backlit LCD displaying active/reactive energy (import/export), power, current, voltage, frequency, power factor, apparent power
Tariffs & Counters:
- Supports intermediate counters, up to tariffs
- Built-in real-time clock
Inputs & Outputs:
- general-purpose inputs and outputs — configurable as pulse outputs (energy) or alarm outputs
- Up to alarm thresholds with time delays
Communication:
- RS‑ with Modbus RTU/EQ‑Bus
- Infrared interface for optional KNX connection
Standards & Certification: IEC ‑/-‑/-‑, EN ‑/-; MID‑approved
Physical Specs:
- DIN‑rail, TE width ( mm), IP; compact housing (×× mm), weight ~. kg
- Operating – °C to + °C
Pulse Output: Programmable rate (– imp/kWh/min/Wh), pulse width – ms

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