Electrical enclosure fabrication and thermal management: reliability over time

The enclosure: the first element of panel reliability

An enclosure is not simply a housing. It is the structure that protects electrical and electronic components from the external environment, ensures accessibility for maintenance, and directly contributes to operator safety. For this reason, its selection cannot be standardized but must be tailored to the actual conditions in which the panel will operate.

Robustness and protection in demanding industrial environments

In the most challenging industrial settings, such as aluminum extrusion and die-casting plants, electrical panels are exposed to dust, moisture, vibration, and mechanical stress. In these environments, HSA selects robust electrical enclosures with high protection ratings, designed to shield components from external factors without compromising performance.

The IP protection rating, sheet metal thickness, and gasket quality are all specified according to the operating environment, ensuring durability and protection even after years of service. The same approach guides the design of panels for the most demanding sectors of metal processing, where an inadequate enclosure can quickly lead to costly production downtime.

In-house machining with the Perforex system

Another key factor is the way the enclosure is manufactured. HSA builds its electrical panels entirely in-house, from drilling and machining mounting plates to milling enclosure structures, as well as wiring and final testing.

For enclosure machining, HSA uses the Perforex system, an automated Rittal machining center that ensures precision, repeatability, and consistent quality, while also improving operator safety. This direct control over hardware production enables HSA to maintain high standards and reliable lead times without depending on external suppliers or subcontracted processes.

Thermal management: keeping heat under control

If the enclosure protects the panel from external factors, thermal management protects it from within. Although often overlooked, it is one of the leading causes of premature component aging.

Why temperature is a critical factor

Inside an electrical panel, devices such as power supplies, drives, contactors, and electronic equipment generate heat during operation. If this heat is not dissipated properly, internal temperatures can rise beyond design limits, accelerating component wear, shortening service life, and increasing the risk of unexpected failures.

Proper thermal management is therefore not a secondary consideration but a direct factor in the long-term reliability of both the electrical panel and the entire plant. Excessive heat also tends to concentrate in the most heavily stressed areas, where it can cause component derating and trigger nuisance trips of protective devices.

Sizing, layout, and ventilation

Heat control begins long before the panel is built, during the design phase itself. This is where the decisions are made that will ensure long-term stability, integrating electrical and thermal requirements into a single, coherent design. Addressing thermal issues after installation is complex and costly, whereas proper evaluation during the design stage prevents most problems before they occur.

Optimizing the internal layout

Through advanced use of EPLAN, HSA optimizes the internal layout of the panel by positioning equipment to ensure accessibility, safety, and effective ventilation. Conductor routing is also carefully planned to avoid interference, reduce cable lengths, and improve overall reliability.

A well-designed layout promotes proper airflow and prevents the formation of heat accumulation zones within the enclosure.

Ventilation calculations and design margins

Cabinet dimensions are not determined solely by the space required for the installed components. They are also calculated to provide adequate room for future expansion and proper ventilation. The design process takes real operating conditions into account, including ambient temperature and humidity levels, and incorporates appropriately sized thermal protection systems.

It is at this stage that the most suitable electrical panel ventilation systems are selected, ranging from natural air circulation to forced ventilation and dedicated cooling systems, always in compliance with applicable standards such as IEC 61439. We have dedicated a specific in-depth article to these design principles, explaining how every decision—from enclosure selection to ventilation strategy—is based on a careful analysis of actual operating conditions.

Enclosures and ventilation in the HSA process

At HSA, enclosure design and thermal management are not treated as separate activities but as two aspects of the same panel-building process. Electrical design, enclosure selection, and heat control are addressed together, because only the right balance between these elements can ensure a reliable result.

When project requirements call for it, HSA also builds panels using modular systems such as the CUBIC system, which provides construction flexibility and makes it easier to adapt to different space constraints and configuration requirements.

From design to testing: reliability over time

Every panel follows a continuous workflow that begins with the single-line diagram and EPLAN design phase, continues through the in-house machining of mounting plates and enclosures, and concludes with wiring and final testing before delivery.

This end-to-end control process makes it possible to verify that both mechanical protection and heat dissipation meet the actual requirements of the plant.

A well-built and thermally balanced panel requires fewer maintenance interventions and maintains its performance over a longer period of time. This advantage continues even after installation through our after-sales service.

Want an electrical panel built to last? Contact the HSA specialists to design the enclosure and thermal management solution that best fit your plant's requirements.