When the 3+1 mode SPD is used in the TT power supply system, the L pole is composed of MOV and the NPE pole is composed of a discharge tube. The L pole pluggable module and the NPE pole pluggable module are easily inserted into the wrong position, causing the SPD to not work properly.
See How We Handle It
Corresponding Solution
We set up an anti-misinsertion device on the pluggable module and the SPD base.
Results
This design can effectively solve the fault caused by the misinsertion of the SPD module.
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