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SIRAX BM1250 – Advanced

Multifunctional measuring device for network parameters

The multifunctional power and monitoring instrument SIRAX BM1250 is suitable for fixed installation and for the measurement of the most important electrical parameters in low-voltage systems.


  • The device can be operated very easily via 3 pushbuttons
  • With its large, backlit LCD display, the measured data is very easy to read
  • The User Assignable Screens feature lets you define 1 to 10 on-screen displays out of 28 screens
  • Easy, flexible and quick installation thanks to Easy Clip or mounting brackets


  • Variety of functions for measuring voltage, current, power, energy and quality
  • Various relay functions integrated (pulse output for energy measurement, limit value output, timer function, RTC relay output)
  • Built-in 8MB Flash Datalogger (event logging, time logging, load profile logger)
  • On-site configuration (configuration via pushbuttons, USB interface or via RS485 / Modbus RTU possible)
  • Easy integration into higher-level systems through open communication via Modbus RTU


  • RS485 interface with Modbus / RTU protocol


  • Password protects against unauthorized modification of programming and configurations
  • No password given from factory default side


  • Current (I1, I2, I3, IN, ISystem)
  • Voltage (U1, U2, U3, USystem, U12, U23, U31)
  • Frequency (f)
  • Power (P1, P2, P3, ΣP, Q1, Q2, Q3, ΣQ, S1, S2, S3, ΣS)
  • Power factor (PF1, PF2, PF3, ΣPF)
  • Phase angle (Cosϕ1, Cosϕ2, Cosϕ3, ΣCosϕ)


  • Total harmonic distortion (THDI1, THDI2, THDI3, THDISystem, THDU1, THDU2, THDU3, THDUSystem)
  • Harmonics up to the 31st harmonic (I1, I2, I3, U1, U2, U3)


  • Active energy (kWh Import/Export)
  • Reactive energy (kvarh Import/Export)
  • Apparent energy (kVah)
  • Run and On hour counter
  • Built-in Real Time Clock
  • Time-based data logger


  • Phase absent indication
  • Phase reversal indication (clockwise/counter clockwise)
  • Number of interruptions


  • Communication RS485 Modbus RTU
  • Relay output (pulse, limit, timer, RTC)

  • Display and control of electrical characteristics in power distribution systems
  • Internal energy billing/monitoring/auditing
  • Submetering and utility billing
  • Electrical load monitoring

Istruzioni per l’uso
Certificato CE
Scheda tecnica