ABB – 1SDA066399R1 – UVR‑C XT1..XT4 Fixed‑Plug Undervoltage Release

The ABB 1SDA066399R1 (UVR‑C XT1..XT4) is a fixed‑plug undervoltage release accessory designed for installation in ABB Tmax XT1 through XT4 molded-case circuit breakers. It instantly trips the breaker when line voltage drops below a preset threshold and prevents automatic reclosure until the supply voltage stabilizes, ensuring reliable protection for industrial electrical systems  .

Key Features:

• Model: 1SDA066399R1 (UVR‑C XT1..XT4 F/P)

• Function: Fixed-plug Undervoltage Release (UVR)

• Rated Voltage: 220–240 V AC / 220–250 V DC  

• Designed for fixed or removable breakers (F/P) in XT1, XT2, XT3, XT4 ranges  

• Compliance: IEC 60947‑2

• Physical Length: 140 mm