Three phase power solid state relay; Zero Cross Solid State Relay specially designed for most types of loads; Output: 24-520VAC (±10%); Input: 24-255VAC/DC; Over-Voltage protection on input (transil) and output (RC+VDR); Thyristors: 50A / 1600Vpeak; Resistive: 24A AC51; Motor: 12A AC53