Lovato DMED330 Three-Phase Energy Meter for CT Connection

Billing-grade active energy metering on a four-module DIN-rail housing

The DMED330 is a three-phase energy meter from the Lovato Electric DMED range, listed as three-phase with and without neutral. It is connected through current transformers with a 5 A secondary (maximum current 5 A) and rated for 380-415 VAC line-to-line and 220-240 VAC line-to-neutral, with an operating range printed in the table.

Accuracy for active energy is Class 0.5s (IEC/EN 62053-22) and for reactive energy Class 2; a calibration LED pulses at 1000 pulse/kWh. The housing is 4 DIN-rail modules wide.

Technical specifications

Selecting the meter

Because the meter is CT-connected, choose current transformers whose primary matches the circuit being measured, with a 5 A secondary and an accuracy class suited to the metering purpose. Direct-connection meters in the same family (DMED300 and others) cover up to 80 A without CTs.

Check whether MID certification is needed for sub-billing; the MID versions carry different order codes, so do not assume this code is a MID version unless the datasheet states it.

Applications and installation

Typical use is sub-metering of motors, chillers, HVAC plant and feeders in a distribution board, with the calibration LED (1000 pulses per kWh, 30 ms pulse duration) or a serial interface feeding a building or energy management system.

Current ratings printed in the datasheet: maximum current 5 A, minimum 0.05 A, transition current 0.25 A, starting current 0.005 mA, reference current 5 A. Operating voltage ranges are 323 to 456 VAC line-to-line and 187 to 264 VAC line-to-neutral, so the meter tolerates normal supply variation. Power consumption is 3.5 VA with a dissipation of 2.7 W, and the housing is polyamide with fixed terminals.

For a clear installation, record the current transformer ratio on the front or in the commissioning sheet, because the meter itself shows secondary-side values and the multiplier must be applied in the reading or in the supervisory software.

Documents and quotation

The Lovato Electric datasheet for DMED330 (English, exported from the manufacturer’s online catalogue) is attached and is the source of the figures above. Please confirm the system voltage, the current transformer ratio and the communication interface you need before you order, and note that the manufacturer may revise datasheet values. Browse automation accessories for alternatives. To order DMED330, submit the quotation form with your quantity and site; Seven Star LLC, an independent supplier in Muscat, handles the reply. The datasheet adds the accuracy classes, input ranges and terminal data needed to commission the instrument correctly.