Advanced microcontroller technology enables seamless switching between main and backup power sources like grids, generators, or solar systems during outages or voltages anomalies. Features a clear LED display showing voltages and output current readings with indicators for accurate power in 100A 2P automatic transfer switches. Adjustable parameters including startup delay (1s 600s), transfer delay (1s 600s), and under/over voltages thresholds (90V 140V ±5V) to safeguards sensitive electrical equipment. Built in protections against overcurrent, overvoltage (140V cutoff), and undervoltage (90V cutoff) with auto cutoff to equipment damage and hazards. DIN rails mounted 100A switches suits hospitals, data centers, solar systems, and refrigeration units with flame retardant ABS housing for indoor/outdoor use.