Input voltage

The input voltage is the electrical voltage that is applied to an electrical device, circuit or system. It represents the energy source with which the system is operated and is also referred to as the supply voltage or supply voltage.

In transformers, the input voltage corresponds to the voltage on the primary side and is often referred to as the upper voltage. Its level, together with the transformation ratio, determines the resulting output voltage on the secondary side.

Depending on the application, the input voltage can be direct current (DC) or alternating current (AC). In three-phase systems, it consists of three phase-shifted alternating voltages.

Correctly matching the input voltage to the technical requirements of an appliance is crucial for safe and efficient operation. An input voltage that is too high or too low can lead to malfunctions, loss of power or damage.