Which device is commonly used for overcurrent protection in HVAC systems?

The KLIXON overload protector is a crucial component for providing overcurrent protection in HVAC systems. It is designed to prevent excessive current from damaging the system's components, such as compressors and motors. When the temperature or current exceeds a certain threshold, the KLIXON device opens the circuit, thereby interrupting the flow of electricity and protecting the system from potential failure due to overheating or electrical overloads.

This type of overcurrent protection is essential in HVAC applications because it directly addresses the risk of operational failures that can arise from excessive current situations. By automatically disconnecting the electrical circuit during abnormal conditions, the KLIXON overload protector helps ensure the longevity and reliability of HVAC equipment.

In contrast, the other options serve different purposes. Capacitors are typically used for power factor correction or for starting motors, not for directly providing overcurrent protection. Surge protectors are designed to protect against voltage spikes rather than sustained overcurrent conditions. Thermistors are temperature-sensitive resistors used for various applications, including temperature sensing or control, but they are not primarily designed for overcurrent protection.