During long-term operation, SPDs may suffer from aging, short circuits, excessive leakage current and other faults. If protected by ordinary circuit breakers directly, problems such as delayed breaking and false tripping are likely to occur, resulting in SPD ignition and power grid tripping.The backup protector is a dedicated protection device designed specifically for SPD. It can realize safe fault breaking without affecting the lightning protection performance of SPD, and complies with national standards including GB/T 18802.1.

A surge protective device (abbreviated as SPD) is also commonly known as an electrical surge protector, lightning arrester, or lightning valve. Its core function is to quickly conduct and discharge the surge current when the circuit is subjected to lightning-induced surges or operational overvoltages, thereby limiting the voltage amplitude and protecting the downstream electrical equipment from overvoltage damage.

Rated discharge current In (8/20μs): This is the current value that the SPD can withstand for more than 10 times of 8/20μs standard lightning current impacts without performance degradation, representing the long-term lightning resistance level of the SPD. 

Maximum discharge current Imax (8/20μs): This is the maximum current value that the SPD can withstand for one 8/20μs lightning current impulse without experiencing breakdown or failure, representing the ultimate lightning resistance capability of the SPD.

The voltage protection level Up refers to the maximum residual voltage value that appears across the terminals of the SPD when subjected to the nominal discharge current In. It represents the SPD's ability to limit overvoltage. The smaller the Up value, the better the protection performance.

SPD is a vulnerable component and needs to be inspected regularly. Once it fails, it must be replaced immediately.

Installation and wiring directly affect the protection effect of the SPD, and strict adherence to the specifications is necessary.

Absolutely not. Ordinary circuit breakers cannot meet the protection requirements of SPD.

The three are the SPD test grades, corresponding to different installation scenarios. The selection must match the installation location.

It has no effect during normal operation and only activates when a surge occurs.