TrueRMS three-phase current value indicator, DMA-3RMS-CT, indirect measurement, with programmable ratio

Three-phase current meter DMA-3RMS-CT – precise measurement and reliability

DMA-3RMS-CT is a digital, three-phase current meter designed to measure the effective (TrueRMS) value of AC current in intermediate circuits using current transformers. The device provides accurate readings even with distorted current waveforms, making it an ideal solution for both professional installers and end-users who require precise load monitoring.

Versatile application and easy installation

The meter is designed for mounting on a 35 mm DIN rail, which simplifies its integration with existing electrical infrastructure. Thanks to its compact dimensions (3 modules, i.e. 52.5 mm wide), it does not take up much space in the switchgear cabinet. Designed to work with current transformers with an output current of 5A, it allows for flexible adaptation to different installation configurations. The LED display with three digits for each phase provides a clear and intuitive reading of the current value.

Key features and benefits:

• TrueRMS measurement: Ensures accurate measurement of the effective AC current value, even with non-linear loads. This is particularly important for electronically powered devices that generate harmonics.
• Programmable ratio: Allows you to adjust the meter to different values of current transformers (20A - 1000A), eliminating the need for additional conversion factors.
• Durable construction: Designed to operate in a wide temperature range (-25°C to +50°C) and characterized by an IP20 protection class, ensures reliable operation even in harsh environmental conditions.
• Clear display: Three-digit LED display for each phase makes it easy to quickly and accurately read the current value.
• Safety of use: Maximum momentary overload 20A/1s and maximum current 6A protect the device from damage. It is recommended to ground one side of the current transformer to increase safety.
• Low power consumption: Power consumption at 4W minimizes the impact on the overall load of the electrical installation.

Technical specifications:

• Supply voltage: 165÷265 V AC/DC
• Measuring range: 0÷5 A
• Accuracy: 1% (measuring range up to 100 A: 0.1 A; above 100 A: 1 A)
• Supply frequency: 45÷55 Hz
• Connection: Screw terminals 2.5 mm² (stranded) / 4.0 mm² (solid)
• Tightening torque: 0.5 Nm
• Dimensions: 3 modules (52.5 mm)
• Protection class: IP20

Remember to exercise caution when installing and connecting the device – disconnect the power to the measured circuits or use shorting links on the secondary side of the current transformer! The DMA-3RMS-CT meter is a solid and precise tool that will perform well in any electrical load monitoring system.