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The thermal sensor or temperature relay is commonly used to monitor the temperature of electrical equipment because it is specifically designed to detect and respond to changes in temperature. These devices function by measuring the temperature of a component or environment and can trigger alarms or cut power if temperatures exceed predefined limits, thereby preventing overheating and potential damage to electrical systems.

Unlike other options, such as voltage regulators which primarily manage voltage levels, fuses that are used for overcurrent protection, and capacitors for storing electrical energy, the thermal sensor focuses solely on temperature monitoring. Its role is crucial in ensuring the safe operation of electrical equipment, helping to maintain the integrity and longevity of machinery and preventing failures due to thermal stress.