The Guardian Electric A421-062510-08 is a 24-volt, current sensing relay module. This type of switch is used to protect circuits from over-current conditions. It has a 0.5-AMP switching capacity and can be used for direct control of motors, pumps, fans, and other equipment. The A421-062510-08 features an adjustable trip delay, test button, and integrated mounting tabs for easy installation. It has a durable plastic housing, cULus approval rating, and is designed for indoor use only.