Midea DTSU666 3-Phase Smart Meter with RS485 & Modbus RTU

The Midea Smart Meter is an intelligent three-phase electricity meter for DIN-rail installation, designed for demanding energy measurement applications in industry, commercial environments and building management. It provides comprehensive monitoring of electrical parameters such as voltage, current, active power, reactive power, frequency, power factor and four-quadrant energy flows.

Thanks to its RS485 interface and Modbus RTU protocol, the device can be seamlessly integrated into existing energy management systems. Precise measurement is based on a specialized ASIC metering chip with high accuracy, complemented by a clear display and easy parameter configuration directly on the device.

Benefits:

• Comprehensive real-time energy monitoring
  Measures voltage, current, active power, reactive power, frequency and energy flows, including four-quadrant measurement, precisely for each phase and in total.
• Future-ready with RS485 & Modbus RTU
  The integrated communication interface allows easy connection to higher-level systems, energy dashboards and remote monitoring solutions.
• Wide temperature range & industrial-grade design
  Operation is possible from -25°C to +70°C. Robust components and durable memory support reliable performance even under demanding conditions.
• Easy configuration & programming
  Relevant parameters such as current and voltage transformer ratios, address, baud rate and display settings can be configured directly on the device.
• Durable and energy-efficient
  Low self-consumption of up to 1.5 W per voltage path and up to 10 years of data retention during power loss support low-maintenance operation.

Product Specifications:

• Model: DTSU666 3×230/400 V
• Rated current: 100 A / 40 mA (CT), optional 250 A / 50 mA
• Pulse rate: 400 imp/kWh
• Power supply: 3×230/400 V AC
• Mounting: DIN35 rail
• Communication: RS485, Modbus RTU, 1200–19200 bps
• Display: 7-digit, energy up to 9,999,999 MWh
• Measurement functions: active power, reactive power, apparent power, frequency, power factor, energy (four quadrants)
• Accuracy class: Class 1 for active power
• Self-consumption: ≤1.5 W or 6 VA
• Operating temperature: -25°C to +70°C
• Storage temperature: -40°C to +70°C
• Front protection rating: IP51, for use in closed switchboards only
• Data retention during power loss: ≥10 years
• Dimensions: 100 × 72 × 65 mm