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DM3T0300 – CURRENT TRANSFORMER 300/5A
Lovato DM3T0300 solid-core current transformer with a 300/5 A transformation ratio, 30 mm cable opening, class 0.5 accuracy and 2.5 VA rated secondary apparent power.
£29.47
Why Choose the Lovato DM3T0300 Solid-Core Current Transformer?
The Lovato DM3T0300 is a dependable solid-core current transformer designed for accurate current measurement in industrial switchboards, electrical distribution panels and energy-monitoring systems. Featuring a 300/5 A transformation ratio, it converts a primary current of up to 300 A into a standard 5 A secondary output for connection to compatible energy meters, ammeters, multifunction measuring instruments and protection relays.
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 DM3T0300 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 variety of switchgear configurations.
With a rated secondary apparent power of 2.5 VA and accuracy class 0.5, the DM3T0300 supports precise current measurement for electrical metering and energy-management applications. Its compact construction, screw-terminal secondary connection and snap-mounting capability help simplify integration into industrial control panels.
Key Advantages
- Reliable solid-core current transformer for new electrical installations.
- 300/5 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.
- Accuracy class 0.5 supports precise current measurement.
- Compact construction with screw connection and snap-mounting capability.
Key Features
- Lovato DM3T series current transformer.
- 300 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 rated secondary apparent power.
- Accuracy class 0.5.
- FS5 overcurrent limiting factor.
- Snap mounting for straightforward panel installation.
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 DM3T0300 converts a primary current of up to 300 A into a standard 5 A secondary signal, allowing meters and protection devices to monitor 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 provides a secure arrangement for continuous energy measurement, load monitoring and electrical system analysis.
Typical Applications
- Industrial switchboards and power-distribution panels.
- Energy meters and multifunction measuring instruments.
- Power analysers and protection relays.
- 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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| Rated Burden (VA) | 2.5 VA | |
|---|---|---|
| Device Type | Solid-core CT | |
| Rated Primary Current (A) | 300 A | |
| Secondary Current / Output | 5 A | |
| Aperture (mm) | 30 mm | |
| Accuracy Class | Class 0.5 | |
| Current | 5 A | |
| Manufacturer | Lovato Electric | |
| Series | DM3T | |
| Model | DM3T0300 | |
| Product type | Solid-core current transformer | |
| Primary current | 300 A | |
| Secondary current | 5 A | |
| Transformation ratio | 300/5 A | |
| Cable opening diameter | 30 mm | |
| Opening width | 20 mm | |
| Opening height | 30 mm | |
| Compatible busbars | 40 × 10 mm, 30 × 20 mm and 25 × 25 mm | |
| Accuracy class | Class 0.5 | |
| Rated secondary apparent power | 2.5 VA | |
| Overcurrent limiting factor | FS5 | |
| Rated operating frequency | 50 / 60 Hz | |
| Number of primary inputs | 1 | |
| Secondary connection | Screw connection | |
| Mounting method | Snap mounting | |
| Calibrated | No | |
| Copper rail included | No | |
| Contact protection | No | |
| Conformity | IEC/EN/BS 61869-1 and IEC/EN/BS 61869-2 | |
| Certification | EAC | |
| Package dimensions | 75 × 65 × 85 mm | |
| EAN | 8013975121863 | |
| HS Code | 85389091 |
Frequently Asked Questions
What is the Lovato DM3T0300 used for?
The DM3T0300 is used to measure electrical currents in switchboards, distribution panels and energy-monitoring systems. It converts a primary current of up to 300 A into a standard 5 A secondary output.
What is the transformation ratio of the DM3T0300?
The current transformer has a 300/5 A transformation ratio, meaning that a nominal primary current of 300 A corresponds to a 5 A secondary current.
What cable size can pass through the DM3T0300?
The transformer accommodates a round cable with a maximum diameter of approximately 30 mm.
Which busbar sizes are compatible with the DM3T0300?
The transformer is suitable for rectangular busbars measuring 40 × 10 mm, 30 × 20 mm or 25 × 25 mm.
Can the DM3T0300 be installed around an existing connected cable?
No. The DM3T0300 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.
