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DM3T0250 – CURRENT TRANSFORMER 250/5A
Lovato DM3T0250 solid-core current transformer with a 250/5 A transformation ratio, 30 mm cable opening, class 1 accuracy and 5 VA burden for electrical current measurement.
£24.01
Why Choose the Lovato DM3T0250 Solid-Core Current Transformer?
The Lovato DM3T0250 is a reliable solid-core current transformer designed for accurate current measurement in industrial switchboards, electrical distribution panels and energy-monitoring systems. Featuring a 250/5 A transformation ratio, it converts a primary current of up to 250 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 DM3T0250 accepts round cables up to 30 mm in diameter and several commonly used rectangular busbar sizes, making it suitable for panel-building, machinery and power-distribution applications.
Operating across a 50–60 Hz frequency range, the transformer provides a rated burden of 5 VA at accuracy class 1. Its compact housing, Faston secondary terminals and flexible DIN rail or screw mounting options help simplify installation while supporting dependable long-term current measurement.
Key Advantages
- Reliable solid-core current transformer for new electrical panel installations.
- 250/5 A transformation ratio for standard industrial metering equipment.
- Suitable for round cables up to 30 mm diameter.
- Compatible with several commonly used rectangular busbar sizes.
- 5 VA burden at accuracy class 1 for dependable current measurement.
- DIN rail or screw mounting provides flexible installation.
Key Features
- Lovato DM3T series current transformer.
- 250 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.
- 5 VA rated burden at accuracy class 1.
- 120% continuous overload withstand.
- 720 V rated insulation voltage.
- IP30 protection rating.
Dependable 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 DM3T0250 converts a primary current of up to 250 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 suited to 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 | |
|---|---|---|
| Rated Primary Current (A) | 250 A | |
| Secondary Current / Output | 5 A | |
| Aperture (mm) | 30 mm | |
| Accuracy Class | Class 1 | |
| Rated Burden (VA) | 5 VA | |
| Device Type | Solid-core CT | |
| Current | 5 A | |
| Manufacturer | Lovato Electric | |
| Series | DM3T | |
| Model | DM3T0250 | |
| Product type | Solid-core current transformer | |
| Primary current | 250 A | |
| Secondary current | 5 A | |
| Transformation ratio | 250/5 A | |
| Cable opening diameter | 30 mm | |
| Compatible busbars | 40 × 10 mm, 30 × 20 mm and 25 × 25 mm | |
| Accuracy class | Class 1 | |
| Rated burden | 5 VA | |
| Operating frequency | 50–60 Hz | |
| Continuous 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 | |
| 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 | 8013975121856 | |
| HS Code | 85389091 |
Frequently Asked Questions
What is the Lovato DM3T0250 used for?
The DM3T0250 is used to measure electrical currents in switchboards, distribution panels and energy-monitoring systems. It converts a primary current of up to 250 A into a standard 5 A secondary output.
What is the transformation ratio of the DM3T0250?
The current transformer has a 250/5 A transformation ratio, meaning that a nominal primary current of 250 A corresponds to a 5 A secondary current.
What cable size can pass through the DM3T0250?
The transformer accommodates a round cable with a maximum diameter of approximately 30 mm.
Which busbar sizes are compatible with the DM3T0250?
The transformer is suitable for rectangular busbars measuring 40 × 10 mm, 30 × 20 mm or 25 × 25 mm.
Can the DM3T0250 be installed around an existing connected cable?
No. The DM3T0250 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 reliable current measurement, straightforward installation and dependable integration with modern energy-monitoring equipment.
