Input devices with AVR (LE-АR) (AVR – automatic transfer switch) are designed to receive, distribute and uninterrupted consumers three-phase alternating-current of frequency 50Hz and voltage 0.4 kV earthed neutral systems electro supply in case of faults  

AVR (LE-AR) provides automatically switching to main supply in case of recovery

AVR (LE-АR) order designation example:

LE-АR-236М-250-54 N3  SS U 31.2-35036863-005:2009