Janitza UMG 103-CBM Universal Measuring Device for DIN Rail, 3-Phase, RS485 Modbus, 0.5S Accuracy, 2 DI/2 DO, 95-240V AC/DC 5228001

In industrial and commercial electrical distribution panels, monitoring power quality and energy consumption is essential for efficient operation and cost control. The Janitza UMG 103-CBM is a compact universal measuring device designed for DIN rail mounting, providing comprehensive measurement of electrical parameters in single-phase, two-phase, or three-phase networks. It is ideal for energy management systems, building automation, and machine monitoring where reliable data acquisition is required.

Key specifications

• Measures voltage, current, frequency, active/reactive/apparent power, energy, power factor, and harmonics up to the 25th order
• Direct voltage measurement up to 300V L-N / 520V L-L (higher voltages via voltage transformers)
• Current measurement via current transformers x/1A or x/5A
• Active energy accuracy class 0.5S according to IEC 62053-22
• RS485 interface with Modbus RTU protocol for integration into higher-level systems
• 2 digital inputs and 2 digital outputs (configurable as pulse or alarm outputs)
• Internal 4 MB flash memory for data logging
• Wide-range power supply: 95-240V AC or 135-340V DC
• Headless design without display, configurable via software
• Compatible with Janitza GridVis software for visualization and analysis

Why choose it

The UMG 103-CBM offers high measurement accuracy and versatility in a compact 3-module DIN rail housing. Its ability to monitor harmonics and log data internally makes it a valuable tool for power quality analysis and energy management. The Modbus RTU interface ensures seamless integration into existing automation and SCADA systems.

Ideal use cases

• Energy monitoring in industrial facilities and commercial buildings
• Sub-metering for tenant billing or cost allocation
• Machine-level power consumption tracking
• Power quality monitoring to detect harmonics and voltage fluctuations
• Integration into building management systems (BMS) and PLCs

Good to know

The device is designed for DIN rail mounting and occupies 3 modules (width 52.5 mm). It has no integrated display, so configuration and data visualization are done via the GridVis software or a Modbus master. The digital outputs can be used for pulse output proportional to energy or for alarm signaling based on measured thresholds.