Lovato DM2TMA0400 compact prewired split-core current transformer with a 400/5 A transformation ratio, 36 x 36 mm nominal opening, 0.5 VA class 0.5 burden and 1.5 VA class 1 burden.
£134.73
The Lovato DM2TMA0400 is a compact, prewired split-core current transformer designed for dependable current measurement in industrial switchboards, electrical distribution panels and energy-monitoring systems. Featuring a 400/5 A transformation ratio, it converts a primary current of up to 400 A into a standard 5 A secondary output for connection to compatible energy meters, ammeters, multifunction measuring instruments and power analysers.
Its split-core construction allows the transformer to be opened and installed around an existing cable or busbar without disconnecting or rerouting the primary conductor. This makes the DM2TMA0400 particularly suitable for retrofit metering projects, electrical system upgrades and installations where reducing modification work and operational disruption is important.
The compact housing incorporates an approximately 36 × 36 mm internal opening and a prewired secondary connection cable for straightforward installation. Operating at 50/60 Hz, the transformer provides a burden of 0.5 VA at accuracy class 0.5 and 1.5 VA at accuracy class 1, supporting reliable current measurement in commercial and industrial electrical systems.
Current transformers provide a safe method of measuring high electrical currents by converting the primary current into a proportional secondary output for compatible instrumentation. The Lovato DM2TMA0400 converts a primary current of up to 400 A into a standard 5 A secondary signal, allowing meters and monitoring devices to measure electrical loads without being connected directly to the high-current circuit.
The hinged split-core design is particularly useful when adding energy monitoring to an existing electrical installation. Once the circuit has been safely isolated, the transformer can be opened, positioned around the conductor and securely closed without removing the cable or busbar. Its compact dimensions and prewired construction help simplify installation in space-restricted switchboards and control panels.
| Current | 5 A |
|---|---|
| Manufacturer | Lovato Electric |
| Series | DM2TMA |
| Model | DM2TMA0400 |
| Product type | Compact prewired split-core current transformer |
| Primary current | 400 A |
| Secondary current | 5 A |
| Transformation ratio | 400/5 A |
| Nominal internal opening | 36 × 36 mm |
| Opening width | approx. 38 mm |
| Opening height | approx. 36 mm |
| Burden at accuracy class 0.5 | 0.5 VA |
| Burden at accuracy class 1 | 1.5 VA |
| Overcurrent limiting factor | FS5 |
| Operating frequency | 50/60 Hz |
| Overload withstand | 120% of rated primary current |
| Rated insulation voltage | 720 V |
| Short-time thermal current | 40–60 × rated primary current for 1 second |
| Rated dynamic current | 2.5 × short-time thermal current |
| Insulation type | Dry, class E |
| Secondary connection | Prewired cable |
| Mounting method | Snap mounting |
| Conformity | IEC/EN/BS 61869-1 and IEC/EN/BS 61869-2 |
| Certification | EAC |
| Product weight | approx. 440 g |
| Package dimensions | 120 × 100 × 50 mm |
| EAN | 8013975219065 |
| HS Code | 85043180 |
The DM2TMA0400 is used to measure electrical currents in distribution panels, switchboards and energy-monitoring systems. It converts a primary current of up to 400 A into a standard 5 A secondary output.
The current transformer has a 400/5 A transformation ratio, meaning that a nominal 400 A primary current corresponds to a 5 A secondary current.
Yes. Its split-core construction allows the transformer to be opened and fitted around an existing cable or busbar after the electrical circuit has been safely isolated.
The transformer has a nominal 36 × 36 mm internal opening, with an approximate opening width of 38 mm, for compatible cables and busbars.
The transformer provides a burden of 0.5 VA at accuracy class 0.5 and 1.5 VA at accuracy class 1, depending on the connected secondary measuring circuit.
Lovato Electric current transformers are used by panel builders, electrical contractors and industrial engineers to provide reliable current measurement, practical retrofit installation and dependable integration with modern energy-monitoring equipment.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...