3UL2302-1ABuy genuine Siemens 3UL2302 1A online The Siemens 3UL2302 1A is a high quality residual current transformer designed for precise residual current monitoring in industrial and factory automation environments. Featuring a compact design with a 35 mm bushing opening, this transformer reliably detects residual currents ranging from 30 mA to 40 A, helping ensure safety and prevent equipment damage. Its robust construction supports touch protection, and it