The ABB YU-1SDA038312R1 is an undervoltage release (UVR) accessory for ABB low-voltage circuit breakers (such as the SACE Emax/E1–E6 series). It is designed to monitor the supply/control voltage and automatically trip (open) the circuit breaker when the supply voltage falls below a safe threshold. This protection helps prevent malfunction, damage to electrical equipment, and unsafe operating conditions in industrial, commercial, and automation systems. The device operates reliably across both 50 Hz and 60 Hz power systems and is suitable for integration in control panels and power distribution equipment.
