The safety of the surge protector is directly related to the safety of the equipment. Therefore, when selecting the surge protector, please refer to it.
Clamping Voltage - This represents the voltage value that will cause the MOV to turn on the ground. The lower the clamp voltage, the better the protection performance. This UL nominal value has three levels of protection - 330 volts, 400 volts, and 500 volts. Typically, a clamp voltage of more than 400 volts is too high.
Energy Absorption/Dissipation Capability - This nominal value indicates how much energy the surge protector can absorb before it is burned, in joules. The higher the value, the better the protection performance. The nominal value of the protector you purchase must be at least between 200 and 400 joules. For better protection, look for products with a nominal value above 600 joules.
Response Time - Surge protectors do not disconnect immediately; they respond slightly to power surges. The longer the response time, the longer the duration that the computer (or other device) will experience a surge. Please purchase a surge protector with a response time of less than one nanosecond.
In addition, you should also purchase a protector with an indicator light to determine if the protective element is functioning. After a number of surges, all MOVs will burn out, but the protector will still work as a power strip. Without the power indicator, it is impossible to know if the protector is still working properly.