As 5-leaded device for 480 Vac phase to phase applications, FSP3-480-20kA provides protection that includes one phase to second phase, one phase to ground, and second phase to ground possible couplings. In-line fusing shuts down LED luminaire when capabilities of surge protector (20,000 A) have been exceeded, and LED indicator shows operational status. These features aid luminaire protection and facilitate issue diagnosis by maintenance crews.