Which type of devices is crucial for limiting voltage to protect electrical insulation?

Voltage-limiting devices are essential in protecting electrical insulation because they serve to restrict the voltage level that can be applied to electrical equipment. This is crucial because excessive voltage can lead to insulation breakdown, causing equipment failures, short circuits, or even catastrophic damage. Voltage-limiting devices monitor the voltage and engage to divert excess voltage or clamp it to safe levels, ensuring that the insulation remains intact and the equipment operates within safe parameters.

Current interrupting devices, protection relays, and power conditioning devices serve different functions. Current interrupting devices primarily focus on breaking the circuit when excessive current is detected, which, while essential for preventing overheating and fires, does not limit voltage directly. Protection relays monitor system conditions and can trigger actions like disconnecting power but do not themselves limit voltage. Power conditioning devices improve the quality of power supply, such as filtering out noise or adjusting voltage levels, but they do not specifically serve the purpose of limiting voltage to protect electrical insulation.