Undervoltage protection is a safety mechanism designed to disconnect electrical equipment or circuits when the voltage drops below a predefined threshold. This prevents potential damage to sensitive components and reduces fire or malfunction risks. In the context of EV charging, such as with Voldt® mobile chargers, undervoltage protection helps ensure that your electric vehicle is never charged under unstable or dangerous voltage conditions.
Why undervoltage is harmful
When voltage falls below the required operating range, electrical devices—especially motors, chargers, and power electronics—may operate inefficiently, overheat, or become damaged. For EV chargers, this could result in incomplete charging, power surges when voltage returns, or even permanent damage to internal components. In extreme cases, undervoltage can cause contactors to “chatter” (repeatedly engage and disengage), leading to wear and fire risk.
How undervoltage protection works
An undervoltage protection circuit continuously monitors the input voltage. If it detects that the voltage drops below a critical level—typically around 180V for a 230V AC system—it instantly disconnects the load. Many advanced chargers, including Voldt® products, automatically resume charging when the voltage returns to safe levels. This smart system is often built into the internal electronics and operates without user intervention.
Voldt® products and integrated safety
All Voldt® charging cables and mobile chargers are designed and produced in Europe with high safety standards. They include integrated undervoltage protection as part of a broader protection package, which also includes overvoltage, overcurrent, overtemperature, and earth fault protection. These safety features comply with CE and TÜV certifications and ensure stable operation even in regions with less consistent power supply, such as rural areas or temporary charging setups with long extension cords.
