The ABB YU-1SDA038312R1 is an undervoltage release (UVR) accessory designed for ABB Emax low-voltage air circuit breakers. Its function is to automatically trip the circuit breaker when the supply voltage drops below a defined threshold, ensuring protection against undervoltage conditions and preventing improper operation of connected equipment. This device is commonly used in industrial electrical systems, automation panels, and safety shutdown circuits where reliable undervoltage protection is required.
