Heschen Surge Protective Device, LYD1-C40/385, 4P 385V 20KA, Fire-Proof, Low-Voltage Arrester, 35mm DIN Rail Mounting (No Remote Terminal)

While it is difficult for me to know with certainty that this product is protecting against all the surges, I'm pleased to have it as I run a number of large sensitive machines in my workshop. They can be expensive to fix and protecting them from surges is very important to me. This device enables that protection to happen right in the fuse box, which is much appreciated.

I am putting about 8000 W of solar Strings on my rooftop and I believe that I’m going to have a final three strings before it goes to the converter box so I am hoping that this is all I need to protect the expensive converter box from any electrical discharges or spikes from lightningIt’s a very simple install with - and three positive inputs which would handle my three legs power coming from the solar panelsI still plan on using a more dedicated string box with breakers and it will have another larger, lightning protector, surge protector Because as our planet is heating up, we are seeing much more heavy rain, storms, more lightning, tornadoes, and hurricanes, or I live in the lower East coastal area of North CarolinaSafety is very important and anything I can do to help protect the system will lower any chances of damage or a fireIt’s a heavily built product a highly recommended it especially if you don’t mind using DIN designed itemsThe photos and description information from the original Amazon page are very accurate and as far as I’m aware, there are no UL listings on this for US laboratory testing so it’s kind of a gamble on your end, but I’m willing to take the chance with all the redundant backup systems that I have

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Most of these din-rail surge protection devices (SPDs) seem to have "In" and "Imax" ratings at about the same level, 20Ka and 40Ka respectively. Where they tend to differ is the "Uc" rating (max continuous voltage), and their "Up" rating (voltage protection level).This SPD has a Uc rating of 375V AC, which is likely just fine for most systems. However, there any many SPDs with higher Uc ratings (600V, 1000V), something that only really matters if you expect higher continuous voltages. Where this SPD shines is the Up rating. Importantly, the lower the Up rating the better as Up is a measure of how well an SPD clamps a surge. As a result, the lower the rated clamping voltage, listed as the Up, the better the clamping. This SPD's Up value is half many other SPDs I've seen.I would trade a lower Uc rating, to a point of course, for a lower Up rating. This SPD is a reasonably good choice for many people given the specs and the price.One note: I've built a number of systems using SPDs, but I am not an expert. My recommendation is to always consult an expert when choosing and wiring an SPD to ensure it can and does the job you want it to.

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