Seasonic PSUSEA500L1U80G, Input frequency 47/63 Hz, Inrush current, cold start: 100A max, Efficiency, at normal input voltage > 87%, Line regulation +/-1% typical, Ripple / noise 1%, MTBF, full load @ 25? amb. >100K hours (Excluding the DC fan), MTBF, full load @ 25? amb. >100K hours (Excluding the DC fan). The Seasonic SS-500 L1U is an EPS 12V industrial switch mode power supply with an 80 PLUS Gold efficiency rating. This unit has fully modular cabling and meets important EMI, EMC and safety standards.