Single-phase electric energy meter SFM118

DIN railRS-485multi-function

Expanded technical description
The SFM118 Series single-phase DIN-rail multifunction meter is designed for integration in 1P2W power distribution systems to provide continuous, high-precision measurement of key electrical parameters for residential, commercial and light-industrial installations. Its compact DIN-rail form factor and RS485 Modbus communication make it suitable for centralized energy monitoring and automation projects.

Measured parameters

• RMS voltage and RMS current
• Active power (P), reactive power (Q), apparent power (S)
• Grid frequency
• Import (consumed) and export (injected) active/reactive energy

Communication & monitoring
Provides RS485 communication with Modbus RTU protocol for connection to PLCs, building management systems and energy monitoring software. Enables remote data acquisition, load analysis, energy bookkeeping and integration into automated power management systems.

Display & accuracy
LCD display with white backlight. Maximum reading 99999.9 kWh. Active energy accuracy: Class 1 / Class B.

Technical parameters

• Model/Series: SFM118 Series
• Rated voltage (Un): 230 VAC; voltage range: 176–276 VAC
• Rated current (direct): 0.25–5(45) A; short overcurrent withstand: 30 Imax for 0.01 s
• Frequency: 50 Hz
• Connecting capacity: 0.5–10 mm²
• Display: LCD with white backlight; max reading 99999.9 kWh
• Active energy accuracy: Class 1 / Class B
• Communication: RS485, Modbus RTU
• Pulse constant: 1000 imp/kWh
• Power consumption: < 2 W / 25 VA
• AC withstand voltage: 4 kV / 1 min
• DC impulse: 6 kV (1.2 µs)
• Operating temperature: -25 °C to +55 °C
• Storage temperature: -40 °C to +70 °C
• Humidity: ≤ 95% (non-condensing)
• Altitude: ≤ 2000 m
• Mechanical environment: M1
• Electromagnetic environment: E2