Relay calibrators are devices used to test and calibrate the performance of electrical relays, providing accurate and reliable calibration. They are used in applications such as power system maintenance, quality control, and industrial automation, ensuring precise relay operation. Relay calibrators offer features such as high precision, digital displays, and automated calibration, making them essential for maintaining the accuracy and performance of relays. Their ability to provide reliable relay calibration makes them valuable for optimizing power system protection and ensuring relay reliability.