How To Select Outdoor Dropout Fuse Cutouts for Tunisia’s 10, 15 And 30 KV Networks

Tunisia’s medium-voltage distribution system includes 10 kV, 15 kV and 30 kV networks in different regions. This means that a fuse cutout for a Tunisian project cannot be selected only by appearance, price or a general description such as “medium-voltage fuse.” The network voltage, highest voltage for equipment, transformer capacity, fuse-link characteristics, breaking capacity, insulation level and installation arrangement must all be confirmed before the final configuration is determined.

DGG Power provides outdoor dropout fuse cutout solutions for rated-voltage requirements from 10 kV to 38 kV, with rated-current options of 100 A and 200 A. In addition to two conventional structures, multiple insulation and mounting configurations are available to support different distribution, transformer-protection and overhead-line projects.

Selected DGG Power fuse cutout models are also supported by KEMA and TÜV type-test reports, helping utility, EPC and distribution-project buyers evaluate the selected product on the basis of technical documentation rather than appearance alone.

What Does an Outdoor Dropout Fuse Cutout Do?

An outdoor dropout fuse cutout is commonly used in overhead distribution systems to protect distribution transformers, lateral branches and selected line sections against overcurrent and short-circuit conditions.

When the current reaches the operating range of the installed fuse link, the fuse link melts and the arc is extinguished inside the fuse tube. The fuse tube then drops into the open position, providing a clear indication that the protected circuit has operated.

This operating principle provides two practical functions. First, the fuse link provides fault protection according to its time-current characteristic. Second, the dropped fuse tube gives maintenance personnel a visible indication of the operated phase.

High-voltage expulsion fuses for AC systems above 1 kV are covered by IEC 60282-2. IEC 60282-4 specifies additional testing requirements for expulsion fuse cutouts using polymeric insulators. The specific standard applied to a DGG product should always be checked against the corresponding test report and technical specification.

Matching the Fuse Cutout to Tunisia’s MV Voltage Levels

The nominal system voltage is the first parameter that a buyer should confirm.

Tunisia uses different medium-voltage levels depending on the region and network arrangement. STEG identifies three-phase 30 kV supply as well as 15 kV networks in certain southern cities and 10 kV networks in certain northern and central cities.

DGG Power can offer fuse cutout solutions for rated-voltage requirements from 10 kV to 38 kV. However, this does not mean that one individual model is suitable for every voltage level.

The selected product must match:

• the nominal network voltage;

• the highest voltage for equipment;

• the required power-frequency withstand voltage;

• the required lightning-impulse withstand voltage;

• phase-to-ground and phase-to-phase clearances;

• creepage-distance requirements;

• the applicable utility or project specification.

For a 30 kV project, for example, the buyer should not simply request a “30 kV fuse.” The full insulation level, equipment class, mounting arrangement and environmental conditions should be stated in the inquiry.

100 A or 200 A: What Does the Rated Current Mean?

DGG Power offers conventional fuse cutout configurations with rated-current options of 100 A and 200 A.

The rated current of the fuse cutout indicates the continuous-current capability of the complete fuse-cutout assembly under specified conditions. It should not automatically be treated as the required rating of the replaceable fuse link.

A 100 A fuse cutout does not necessarily require a 100 A fuse link, and a 200 A fuse cutout does not mean that every application should use a 200 A fuse link.

The appropriate fuse-link rating depends on several coordinated factors, including:

• transformer rated capacity;

• transformer primary current;

• expected overload conditions;

• inrush current;

• upstream and downstream protection;

• fault-current level;

• required operating time-current characteristic.

For transformer protection, the fuse link must allow normal energization and expected loading while operating correctly under sustained overcurrent or fault conditions. Therefore, transformer capacity and protection-coordination data should be provided before the fuse link is selected.

Two Conventional Fuse Cutout Configurations

DGG Power offers two conventional fuse cutout structures for different project requirements.

Conventional Polymer Dropout Fuse Cutout

The first configuration uses a compact polymer-insulated structure with a removable fuse tube, upper and lower contacts, operating rings and mounting hardware.

Its relatively compact arrangement can be evaluated for overhead distribution and transformer-protection projects according to the required voltage level, installation dimensions, insulation performance and conductor arrangement.

Extended-Insulation Polymer Dropout Fuse Cutout

The second configuration uses an extended insulation arrangement and a different supporting structure.

This type of configuration may be considered where the project requires a different insulation path, mounting arrangement, equipment layout or mechanical structure. It should not be selected only because it appears longer or larger. The required insulation level, creepage distance, dimensions and applicable test documentation must still be confirmed.

Beyond these two conventional products, DGG Power can provide other fuse cutout appearances and structural configurations. The purpose of customization is not cosmetic variation; it is to match the customer’s electrical, insulation, installation and project-documentation requirements.

Why Type-Test Documentation Matters

For utility, EPC and distribution projects, a catalogue and quotation are usually not enough to evaluate a fuse cutout.

Buyers may also need to review:

• product technical data;

• general arrangement and mounting drawings;

• fuse-link information;

• insulation and breaking-performance data;

• type-test documentation;

• factory inspection records;

• product identification and traceability;

• operation and maintenance information.

Selected DGG Power fuse cutout models are supported by type-test reports issued by KEMA and TÜV.

The correct wording is important: a type-test report is evidence that a specified model or product configuration was tested under the conditions and standards recorded in that report. It should not automatically be interpreted as approval for every model, voltage level or Tunisian utility project.

Before ordering, the buyer should confirm:

1. which product model is covered by the report;

2. the rated voltage and rated current stated in the report;

3. the applicable test standard;

4. whether the offered configuration matches the tested configuration;

5. whether additional project or utility requirements apply.

This model-by-model verification is more reliable than using a general statement such as “all products are certified.”

Selecting the Correct Insulation Configuration

Outdoor fuse cutouts operate under changing environmental conditions. Dust, humidity, rainfall, industrial pollution, salt deposits and temperature variation can affect the external insulation requirements of the equipment.

The selected configuration should therefore be based on the project’s actual conditions, including the specified pollution level and creepage distance.

A longer insulation structure is not automatically the correct choice for every site. The buyer should first confirm the required insulation level and then select a product whose tested configuration and dimensions meet that requirement.

For projects near coastal areas, industrial zones or locations with significant airborne contamination, the environmental information should be included in the technical inquiry so that the insulation and material configuration can be evaluated properly.

What Should Tunisian Buyers Provide Before Requesting a Quotation?

A clear technical inquiry helps the supplier recommend the correct product and prevents repeated revisions after quotation.

The following information is especially useful:

When exact information is not yet available, buyers can send the single-line diagram, transformer data, existing product photos, mounting drawings or tender specifications for technical review.

Customized Fuse Cutout Solutions from DGG Power

Not every distribution project uses the same mounting dimensions, fuse tube, terminal arrangement or insulation structure.

DGG Power can provide project-based configuration support according to:

• rated-voltage requirements from 10 kV to 38 kV;

• 100 A or 200 A rated-current requirements;

• required insulation level and creepage distance;

• fuse-link and fuse-tube requirements;

• mounting dimensions and brackets;

• terminal and conductor arrangements;

• operating-ring and handling requirements;

• product identification and traceability;

• packaging, spare-parts and documentation requirements.

Where a buyer requires KEMA or TÜV type-test documentation, the offered model must first be matched with the model and parameters covered by the corresponding report.

DGG Power can also support factory inspection, product testing, technical-document review and remote witness activities according to the agreed project scope.

Who Is This Solution Intended For in Tunisia?

These fuse cutout solutions may be relevant to:

• local electrical-equipment distributors;

• medium-voltage equipment agents;

• overhead-line contractors;

• distribution-transformer manufacturers and integrators;

• power EPC companies;

• industrial distribution projects;

• renewable-energy grid-connection contractors;

• companies participating in utility distribution projects.

DGG Power does not present these products as automatically approved by a specific Tunisian utility. Qualification, technical acceptance and tender compliance must be assessed according to the requirements of each project.

For local agents and distributors, the more practical approach is to identify the target voltage levels, commonly requested dimensions, fuse-link practices and tender-document requirements before finalizing a local product portfolio.

FAQ: Fuse Cutouts for Tunisia

What voltage ratings can DGG Power provide?

DGG Power can provide outdoor fuse cutout solutions for rated-voltage requirements from 10 kV to 38 kV. The specific model and insulation configuration must be selected according to the network voltage and technical specification.

Are 100 A and 200 A fuse cutouts available?

Yes. Rated-current options include 100 A and 200 A, subject to the selected structure, voltage level and project requirements.

Can DGG Power provide fuse cutouts for 30 kV networks in Tunisia?

DGG Power’s product range includes configurations intended for voltage requirements up to 38 kV. For a 30 kV Tunisian network, the highest equipment voltage, insulation level, breaking capacity, dimensions and applicable test report must be reviewed before confirming the model.

Are KEMA and TÜV type-test reports available?

Selected DGG Power fuse cutout models are supported by KEMA or TÜV type-test reports. The applicable report depends on the selected product model and configuration.

Is the fuse-link included with the fuse cutout?

The supply scope should be confirmed during quotation. The required fuse-link rating and characteristic must be selected according to transformer capacity, protection coordination and project requirements.

Can the product structure be customized?

Yes. DGG Power offers multiple conventional and customized structures based on voltage level, rated current, insulation requirements, mounting dimensions, terminal arrangements and technical specifications.

Can DGG Power support a local distributor or agent?

DGG Power can discuss product configuration, technical documents, test-report availability, packaging, sample evaluation and project-based supply with qualified local partners.

Conclusion

Selecting an outdoor dropout fuse cutout for Tunisia requires more than choosing a product that looks similar to an existing installation.

The correct configuration must match the network voltage, highest equipment voltage, rated current, fuse-link requirements, breaking capacity, insulation level, mounting arrangement and environmental conditions.

DGG Power offers fuse cutout solutions for 10–38 kV rated-voltage requirements, with 100 A and 200 A rated-current options. Selected conventional models are supported by KEMA and TÜV type-test reports, while additional structures and project-based customization are available for different technical requirements.

Looking for outdoor fuse cutouts for a medium-voltage project in Tunisia? Send DGG Power your network voltage, transformer capacity, required current rating, fuse-link information, breaking-capacity requirement, insulation level, mounting arrangement, technical specification and purchase quantity. Our team will help you evaluate a suitable configuration.