Surge Protection

Technical wiring guide Need to wire an SPD remote alarm contact to a PLC digital input? This guide shows how to connect NO / NC / COM dry contacts to…

SPD Failure Check Guide Not sure whether the SPD in a distribution board, OEM panel, or solar combiner box has failed? This guide shows a practical inspection process for maintenance…

Maintenance & Replacement Guide Can you replace only the SPD cartridge? When an SPD indicator window turns red, or a remote signal contact sends an alarm, maintenance teams need a…

SPD Bulk Order Certificate Verification Before placing a bulk SPD order, do not check certificates only by looking at the logo. A useful certificate must be traceable, must cover the…

SPD Procurement Guide When buying surge protective devices, do not only ask whether the supplier has CE, TUV, CB or RoHS. The real question is whether those documents match the…

SPD Standard Guide for Buyers Buying an AC SPD? Check IEC 61643-11. Buying a PV/DC SPD for the solar DC side? Check IEC 61643-31. This guide explains the difference between…

Three-Phase SPD Wiring Guide Need a three-phase SPD wiring diagram for a distribution board, control panel, or OEM electrical cabinet? The key point is simple: a three-phase SPD is not…

Ordering SPDs in bulk is not only about price. Before a distributor, OEM buyer, or panel builder places a bulk SPD order, the supplier should confirm the real application, system…

RS485 Surge Protection Guide Not sure how to wire or select an RS485 SPD for a PLC control panel? RS485 communication lines are common in PLC systems, Modbus RTU networks,…