Alce Electrik 4MR12-F Power Transformer: What Changes for the Electrical Sector

Key data

Distribution companies and grid operators working with the Alce Electrik 4MR12 variant F voltage measurement transformer have an immediate obligation: to review whether their installation processes and planned equipment comply with the new authorization terms in effect as of April 1, 2026.

The General Secretariat of Industry and Energy Development has issued a resolution that modifies the authorization of this specific model for its use and installation in the Spanish electrical network. The official reference is BOE-A-2026-9521, published on May 1, 2026 with retroactive effect from April 1, 2026.

This is not a new authorization, but rather a modification of a pre-existing authorization. This means that the equipment was already approved for use on the network, but the conditions under which it operates have been updated.

What does this regulation establish?

The resolution modifies the authorization of the 4MR12 variant F model from Alce Electrik, a voltage measurement transformer in high voltage intended for installation in the Spanish electrical network.

The aspects that may have been modified, according to the type of resolutions of this nature, include:

• Technical specifications for equipment operation
• Conditions of use in the high voltage network
• Installation requirements previously approved
• Parameters under which the model can operate in the Spanish electrical system

The resolution does not establish a replacement of the model or a market withdrawal: it updates the authorization conditions under which the 4MR12 variant F can continue to be installed and operated.

Economic and operational impact

This resolution does not generate a direct quantified cost in its text. However, it has concrete operational implications for affected companies:

• Review of ongoing projects: Any installation project of the 4MR12 variant F that was planned or in execution as of April 1, 2026 must be reviewed to ensure it complies with the new authorization terms.
• Possible installation suspension: If the new requirements involve changes to the installation process, companies may need to adapt procedures before continuing with new deployments of the equipment.
• Cost of internal verification: Operators and distributors must allocate technical resources to review the compliance of their planned installations with the new terms.
• Impact on the manufacturer: Alce Electrik may need to update technical documentation, product sheets or installation instructions to reflect the new authorization terms.

The actual cost will depend on the specific scope of technical changes introduced, which are only visible in the full text of the resolution published in the BOE.

Who does it affect?

• Alce Electrik: As the manufacturer of the 4MR12 variant F model, it is the primary affected party. It must ensure that the technical and commercial documentation of the equipment reflects the new authorization terms.
• Electrical energy distribution companies: Those that plan to install or already operate with the 4MR12 variant F model in their high voltage networks.
• Grid operators: Network operators that use this measurement transformer in their high voltage installations.
• Electrical engineering and maintenance companies: That execute installation projects of this equipment for third parties.
• Technical and regulatory compliance departments of any company in the electrical sector that works with this model.

Practical example

An electrical energy distribution company has planned the installation of ten units of the Alce Electrik 4MR12 variant F measurement transformer in a high voltage substation during the second quarter of 2026.

Since the authorization modification came into force on April 1, 2026, before proceeding with any installation, the company's technical manager must:

1. Obtain the full text of resolution BOE-A-2026-9521 and review what technical conditions have changed compared to the previous authorization.
2. Verify whether the planned installation procedures remain compliant with the new terms.
3. Contact Alce Electrik to confirm whether the manufacturer has updated the technical documentation of the 4MR12 variant F model accordingly.
4. If there are discrepancies, adapt the installation project before executing it.

Proceeding with installation without having verified these points could result in equipment installed under conditions that do not conform to the current authorization, with the technical and regulatory implications that this entails.

What should companies do now?

1. Download and read resolution BOE-A-2026-9521: Access the full text in the BOE to identify exactly what technical conditions have changed in the authorization of the 4MR12 variant F.
2. Review ongoing or planned installation projects: Identify if you plan to install this model and verify that the planned procedures comply with the new terms in effect as of April 1, 2026.
3. Contact Alce Electrik: Request from the manufacturer the updated technical documentation of the 4MR12 variant F model that reflects the new authorization terms.
4. Update internal procedures if necessary: If the changes affect how the equipment is installed or operated, update internal technical procedures before executing new installations.
5. Inform engineering and construction teams: Ensure that the technicians who execute installations of this equipment are aware of the new requirements and do not operate under the terms of the previous authorization.