What can improper selection of protection devices lead to?

The improper selection of protection devices can lead to safety hazards and equipment damage because these devices are designed to prevent overload, short circuits, and other fault conditions that can arise in electrical systems. If the wrong device is chosen—whether due to incorrect ratings, inappropriate type for the application, or failing to account for environmental factors—the device may not operate as intended during a fault condition.

For example, a protection device rated for lower capacity than the actual load may fail to trip during an overload situation, which can result in overheating, potential fires, or damage to the equipment it is meant to protect. Similarly, if a device is not suitable for its environment—such as an outdoor installation without proper weatherproofing—it can degrade over time, leading to failure when needed most. Thus, ensuring the correct selection and sizing of protection devices is critical for maintaining safety and ensuring the longevity and reliability of electrical systems.