ABB yu-1sda038312r1 Undervoltage Release Relay

ABB YU-1SDA038312R1 Undervoltage Release is a 220/240V AC/DC UVR accessory for ABB SACE moulded‑case circuit breakers, designed to trip the breaker if the supply voltage falls outside the preset range. The 1SDA038312R1 variant features a coil rated for 220–240V and supports both AC and DC operation, designed for E1/6-T8 type installations where reliable undervoltage protection is required. In practical use, it is installed in control panels, motor control centers, and switchgear to ensure protective opening of the circuit-breaker during undervoltage events, preventing unsafe starts and potential equipment damage. As part of ABB's YU undervoltage release lineup, this model is specified to work with 220/240V systems and provides a standardized accessory solution for ABB SACE equipment, helping maintain safe, compliant power distribution in industrial environments.