Which device is used to protect against temporary, above-normal voltages?

A surge protector is designed specifically to safeguard electronic devices from temporary overvoltage situations, often referred to as voltage spikes or surges. These surges can occur due to various reasons, such as lightning strikes, power outages, or fluctuations in the power supply. The surge protector works by diverting excess voltage away from connected devices, thereby preventing potential damage that such spikes could cause.

In contrast, a UPS (Uninterruptible Power Supply) primarily provides backup power during outages and can regulate voltage to some extent, but its main function is not surge protection. A power strip typically offers multiple outlets for power distribution and may or may not include surge protection features. A voltage regulator is used to maintain a constant voltage level and can help in scenarios of continuous over or under-voltage, but it does not offer the quick response needed to handle temporary spikes like a surge protector does.