Electric Energy Meter - 3-Phase RS-485, Reactive Energy LE-03MQ

The LE-03MQ CT v.2 meter is a three-phase, electronic electric energy consumption meter designed for semi-direct (using current transformers) or indirect measurement. It allows for the registration of active and reactive energy in both directions (import/export) and monitoring of network parameters such as voltage, current, power, frequency, and power factor. The device is equipped with a backlit, multifunctional LCD display and configuration buttons as well as an RS-485 communication interface with Modbus RTU protocol.

The manufacturer of the device is the Polish company F&F Filipowski sp. komandytowa (F&F), specializing in the production of measuring instruments and electrotechnical devices. The company provides documentation, declarations of conformity (MID, CE), and service support. The product has an individual factory number (laser engraving) and configuration protection with a password.

Electrical Parameters

• Rated Voltage: 3×230/400 V
• Measurement Voltage Range: L–N 176–276 V AC, L–L 304–480 V AC
• Nominal / Base Current: 3×5 A (max. current 3×6 A)
• Minimum Measured Current: 0.02 A
• Measurement Accuracy: Class B (EN50470-1/3)
• Rated Frequency: 50/60 Hz
• Pulse Outputs: 2 (open collector), max. voltage 27 V DC, max. current 30 mA; configurable meter constant (default 1 imp/[kWh/kVarh] for output 1; output 2: 3200/CT imp/kWh)
• Communication: RS-485 port, Modbus RTU protocol, Modbus address 1–247, transmission speeds: 2400, 4800, 9600 (factory), 19200, 38400 bps, parity: NONE (factory), EVEN, ODD; stop bits: 1 (factory) or 2
• Meter Constant (pulse meter): 3200 imp/kWh (main indication)

Mechanical and Environmental Parameters

• Enclosure: PC+ABS material
• Dimensions: 4 modules (72 mm)
• Mounting: on TH-35 rail
• Protection Class: internal IP51 (recommended enclosure), external IP54 (required enclosure)
• Operating Temperature Range: -25 ÷ 55 °C
• Humidity: ≤95% (without condensation)
• Mounting Height: up to 3000 m above sea level.
• Terminal Connection: screw 0.5 ÷ 1.5 mm², tightening torque 0.4 Nm