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DM3T0400 – CURRENT TRANSFORMER 400/5A
Lovato DM3T0400 solid-core current transformer with a 400/5 A transformation ratio, 30 mm cable opening, 2.5 VA class 0.5 burden and 5 VA class 1 burden for electrical current measurement.
£29.47
Why Choose the Lovato DM3T0400 Solid-Core Current Transformer?
The Lovato DM3T0400 is a dependable solid-core current transformer designed for accurate 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 solid-core construction provides a secure and durable measuring solution for new electrical installations where the primary conductor can be routed through the transformer during panel assembly. The DM3T0400 accommodates round cables up to 30 mm in diameter and rectangular busbars measuring 40 × 10 mm, 30 × 20 mm or 25 × 25 mm, providing installation flexibility across a range of switchgear and control-panel configurations.
Operating at 50–60 Hz, the transformer provides a burden of 2.5 VA at accuracy class 0.5 and 5 VA at accuracy class 1. Faston secondary terminals, DIN rail or screw mounting and an IP30 protection rating help simplify installation while supporting reliable long-term current measurement.
Key Advantages
- Reliable solid-core current transformer for new electrical installations.
- 400/5 A transformation ratio for standard industrial measuring equipment.
- Suitable for round cables up to 30 mm diameter.
- Compatible with multiple commonly used rectangular busbar sizes.
- Class 0.5 and class 1 measurement options for dependable electrical monitoring.
- DIN rail or screw mounting provides flexible panel installation.
Key Features
- Lovato DM3T series current transformer.
- 400 A rated primary current.
- 5 A rated secondary current.
- Solid-core construction for secure conductor installation.
- 30 mm circular cable opening.
- Suitable for 40 × 10 mm, 30 × 20 mm and 25 × 25 mm busbars.
- 2.5 VA burden at accuracy class 0.5.
- 5 VA burden at accuracy class 1.
- 120% continuous overload withstand.
- 720 V rated insulation voltage.
Accurate Current Measurement for Electrical Panels
Current transformers provide a safe method of measuring high electrical currents by converting the primary current into a proportional lower-current output for compatible instrumentation. The Lovato DM3T0400 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 solid-core construction is particularly suitable for new switchboard and control-panel assemblies. During installation, the cable or busbar is passed through the transformer opening before the primary circuit is connected. This creates a secure arrangement for continuous energy measurement, electrical load monitoring and power-system analysis.
Typical Applications
- Industrial switchboards and power-distribution panels.
- Energy meters and multifunction measuring instruments.
- Power analysers and electrical monitoring systems.
- Building energy-management systems.
- Industrial machinery and automation panels.
- Electrical load and maximum-demand monitoring.
- Commercial power-distribution installations.
- New panel-building and switchgear projects.
Technical Specifications
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| Mounting Type | DIN rail, Panel / base | |
|---|---|---|
| Device Type | Solid-core CT | |
| Rated Primary Current (A) | 400 A | |
| Secondary Current / Output | 5 A | |
| Aperture (mm) | 30 mm | |
| Rated Burden (VA) | 2.5 VA | |
| Current | 5 A | |
| Manufacturer | Lovato Electric | |
| Series | DM3T | |
| Model | DM3T0400 | |
| Product type | Solid-core current transformer | |
| Primary current | 400 A | |
| Secondary current | 5 A | |
| Transformation ratio | 400/5 A | |
| Cable opening diameter | 30 mm | |
| Compatible busbars | 40 × 10 mm, 30 × 20 mm and 25 × 25 mm | |
| Operating frequency | 50–60 Hz | |
| Continuous overload withstand | 120% of rated primary current | |
| Burden at accuracy class 0.5 | 2.5 VA | |
| Burden at accuracy class 1 | 5 VA | |
| 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 | |
| Terminal type | Faston | |
| Mounting method | DIN rail or screw fixing | |
| Protection rating | IP30 | |
| Operating temperature | -25°C to +50°C | |
| Storage temperature | -40°C to +80°C | |
| Maximum relative humidity | 90% | |
| Conformity | IEC/EN/BS 61869-1 and IEC/EN/BS 61869-2 | |
| Certification | EAC | |
| Product weight | approx. 260 g | |
| Packaged weight | approx. 340 g | |
| Package dimensions | 75 × 65 × 85 mm | |
| EAN | 8013975121870 | |
| HS Code | 85389091 |
Frequently Asked Questions
What is the Lovato DM3T0400 used for?
The DM3T0400 is used to measure electrical currents in switchboards, distribution panels and energy-monitoring systems. It converts a primary current of up to 400 A into a standard 5 A secondary output.
What is the transformation ratio of the DM3T0400?
The current transformer has a 400/5 A transformation ratio, meaning that a nominal primary current of 400 A corresponds to a 5 A secondary current.
What cable size can pass through the DM3T0400?
The transformer accommodates a round cable with a maximum diameter of approximately 30 mm.
Which busbar sizes are compatible with the DM3T0400?
The transformer is suitable for rectangular busbars measuring 40 × 10 mm, 30 × 20 mm or 25 × 25 mm.
Can the DM3T0400 be installed around an existing connected cable?
No. The DM3T0400 has a solid-core construction, so the conductor must be disconnected or passed through the transformer during panel assembly. A split-core transformer is more suitable when an existing conductor cannot be removed.
Trusted Current Measurement from Lovato Electric
Lovato Electric current transformers are widely used by panel builders, electrical contractors and industrial engineers to provide accurate current measurement, straightforward installation and dependable integration with modern electrical monitoring equipment.
