Power supply in the control cabinet
The key aspect of modern switch mode power supplies
DC 24 V is the established standard in industrial automation and predominantly power Control systems, sensors, actuators and safety devices. The widespread availability of compatible components, combined with the safe voltage level, makes 24 V the first choice for conventional control and monitoring tasks.
However, there is growing interest in DC 48 V, wherever high power must be transmitted efficiently, for example in robotics, modular machinery, automated guided vehicle systems, or in IT and telecommunications. Thanks to the higher voltage, the current levels decrease, which reduces line losses and allows for smaller cable cross sections. This saves materials, improves energy efficiency and helps set up high-performance systems.
The power rating alone is not sufficient to assess a power supply unit. The crucial part is the combination of several characteristics.
High efficiency
Power supplies with efficiency levels of about 96 % significantly reduce energy losses and heat generation. This reduces the load on cooling systems, extends the service life of adjacent components and, in the long term, reduces maintenance and operating costs. This contributes to plant availability.
Compact design
Every millimetre counts in the control cabinet. As a result of the high power density, enclosures become smaller, which leaves more space for additional components or retrofit projects. Modern power semiconductors from gallium nitride (GaN) and silicon carbide (SiC) are making a significant contribution to this development.
Convenient installation and maintenance
Tool-free DIN rail mounting, push-in connection technology, clearly visible status LEDs and clear labelling reduce installation and servicing times. Due to shortages of skilled workers, these user-friendly solutions are becoming increasingly attractive.
Robustness in industrial applications
Switch mode power supplies must operate reliably even under difficult conditions. A wide input voltage range, high MTBF values, vibration resistance and international approvals ensure reliable operation across a variety of applications and markets.
Conclusion
Modern switch mode power supplies cover more than just the power supply. High efficiency, compact dimensions, user-friendliness and industrial robustness enhance plant cost-effectiveness and availability. E-T-A’s PFA10 series combines these features and supports both conventional 24 V applications and modern 48 V system architectures. With the new PFA10-T product group, we are introducing the next generation of our switch mode power supply units for automation technology. The devices are designed for maximum reliability, energy efficiency and a long service life. Compact, simple and efficient, they provide a stable basis for a reliable system operation.
