over load protection:105%-150% hiccup mode ,auto-recovery over-voltage protection:115%-135% cut off output,auto-recovery setup rise hold up time:200ms,50ms,20ms withstand voltage:I/P-O/P:1.5KvAc 1 mintute,I/P-FG:1.5KvAc 1 mintute, I/P-O/P:0.5KvAc 1 mintute, working temperature:-10℃~+60℃,20%~90RH I II.Precautions 1.Check if the access voltage meets the require ments before the power is turned on. 2.The power suply has automatic short circuit protection and cuts off the output. 3.The power supply should be well grounded before use. The grounding point is at the left side of the terminal.