RISK OF ELECTRICAL SURGESLightning and surge protectionElectrical and electronic equipment is indispensablein the daily activities of today’s businesses andindividuals. Such devices are connected to theelectricity grid, often exchanging data and signalsthrough communication lines and are usually sensitiveto disturbances. These interconnecting networksprovide a propagation path for overvoltages.Protection against lightning and overvoltagesnot only ensures the safety of people, goods andequipment, but also ensures continuity of installationservices and meet criteria of energy efficiency.Overvoltage protection extends the life of theequipment by more than 20%, which significantlyreduces the volume of electronic waste. It alsoreduces the power consumption of the installations,all of which translates into cost savings andenvironmental sustainability.or transmission line or the associated inductionof electromagnetic fields on metallic conductors.Outdoor and longer lines are the most exposedto these fields, which often receive high levelsof induction.It is also common for non-weather phenomena, suchas transformer centre switching or the disconnectionof motors or other inductive loads to cause voltagespikes in adjacent lines.The protector will discharge excess energy to earth,thus limiting the peak voltage to a value acceptablefor the electrical equipment connected.U(V)40003500300020005.000.000Lightning strikes per day100050030kAAverage currentof a lightning strike61%electrical damagescaused by surges02468101214161820t(ms)-5001ms max.1000When the peak voltage reaches a value higher than the equipmentcan withstand, it causes its destruction.The importance of the groundconnectionTransient voltage surgesin LV power linesA ground in proper conditions is therefore an aspectnot to overlook when it comes to effective surgeprotection. Continuously monitoring the state ofthe ground connection ensures proper operationof surge protection devices. See page 27.Operating principle of an SPDTransient overvoltages are voltage surges that canreach tens of kilovolts with a duration of the order ofmicroseconds.Despite their short duration, the high energy contentcan cause serious problems to equipment connectedto the line, from premature aging to destruction,causing disruptions to service and financial loss.This type of surge can have various different causes,including atmospheric lightning directly strikingthe external protection (lightning rods) on a building2 Mersen Surge-Trap SolutionsSPDequipmentPE

WHY MERSEN?Expertise in power qualityYour global electrical powerpartnerMersen is a leading market player with innovativesolutions in the field of lightning and surge protection.We design, manufacture, test and certify our productsand your systems.Safety & reliability for surgeprotection Bringing together the experience of the principalinternational manufacturing and test standardsfor SPDs (IEC and UL) Unique expertise in the combination of SPDand fuse technology, one of the hot topicsin the SPD industryLightning and surge protectionMersen offers a wide range of solutions alongwith advice and consulting services as well asafter sale serviceSPD – Surge-Trap Surge protective devices to IEC and NEMA/UL.Also for telecom and signalling networks.See page 12-29GND – Grounding system monitors.See page 31REC – Smart automatic reclosers.Fully programmable. POP (TOV) RCD MCBSee page 30 Innovative ranges combining surge protectionand ground monitoring to provide full safetyand continuity of servicePOP (TOV) – Power-frequency Overvoltage Protection.EN 50550. (Temporary Overvoltages TOV)See page 30 World-class surge test platform, with laboratoriesholding accreditations for both IEC/EN 61643-11(Terrassa) and UL 1449 3rd ed (Newburyport)ESE – Electronic Early Streamer Emission lightningair terminals. Global manufacturing footprint of a comprehensiverange of solutions covering both IEC and UL markets Leadership in POP (TOV) (Power-frequencyOvervoltage Protection) and combined SPD POPdevices. EN 50550.IMD – Insulation Monitoring Devices.Electric vehicle, photovoltaic and IT power supplies. Wide range of solutions targeting industrial,commercial and residential applicationsWorld-class surge test platformMersen is committed to innovation. The proof of thatquest for continual improvement: a total of more thana million tests in 25 years!Mersen welcomescustomers at bothlocations to run testcampaigns focusedon critical points in theirown bills of requirementsIn the field of lightning and surge protection Mersenhas a highly specialized team, test laboratories,high investment in R&D&i, international patentsand presence on standards committees.Mersen has two surge test labs: one in Newburyport,Massachusetts, and one state of the art Lightningand Surge protection test lab in Terrassa, Spain,namely the Global Center of Excellence for IEC SurgeProtection. The two are complementary, in termsof the available resources, to be able to offerthe widest possible range of tests to IEC, UL andNFC standards.Mersen Surge-Trap Solutions 3

I M P L E M E N T I N G T H E P R OT E C T I O N TO I E C 6 1 6 43 -11Protection parametersaccording to IEC 61643-11IimpWhen selecting an SPD, several points must beconsidered: Network topology: TNS, TNC, TT, IT, PVand No of conductors. Nominal voltage rating (Un) of the supply.Impulse currentPeak current with 10/350μs waveform whichthe protection device can withstand withoutreaching end of life.ImaxMaximum discharge currentPeak current with 8/20μs waveform whichthe protection device can withstand withoutreaching end of life.InNominal currentPeak current in 8/20μs waveform the protectiondevice can withstand 20 times without reachingend of life.UpVoltage protection levelMaximum residual voltage between the terminalsof the protection device during the applicationof a peak current equal to the nominal current (In).UcMaximum continuous operating voltageMaximum effective voltage that can be appliedpermanently to the terminals of the protectiondevice.Both features will condition the maximum continuousoperating voltage (Uc) as the IEC standard 60364-5534 sets the minimum allowed value of Uc dependingon the system configuration, taking into account asafety margin of the device above the nominal voltage. Voltage withstand rating (Ue) of the equipmentin the installation.The protection device should beselected so that the voltage protection level (Up)is compatible with (lower than) the value of Ue.IEC standard 60364-4-443 classifies equipment intofour categories, based on the impulse voltage theyare capable of withstanding. (See page 5, figure) Exposure of the installation to atmosphericand non-weather phenomena.Exposure ratingsThe actual exposure of an installation depends on thecombination of 3 basic criteria: (1) electrical servicesystem, (2) external (and internal) switching of loadsand (3) lightning strike density (isokeraunic level).Factors (1) and (2) generate three possible situations:Direct impact exposure of an installationfitted with external lightning protectionsystem or close to a tower or elementsusceptible to receive a strike.UocOpen circuit voltage (combined voltage pulse)This parameter is used only for the Class III testand is applicable to a Type 3 SPD. It consistsof the injection of a combination wave (1.2/50μsin open circuit - 8/20μs in short circuit).High exposure of an installation fed by longoverhead service lines or situated in largeindustrial or commercial premisses.IfiFollow current extinction capabilityThis parameter is only devoted to surge protectorsusing “air gap” technology. Once they have“switched”, these surge protectors conduct partof the network current (follow current) and needto interrupt it.Medium exposure of installations with anunderground service and not subject toswitchings of industrial loads in the vicinity.Factor (3), the isokeraunic level of a certain country.See page 8 for a basic recommendation guide.Isokeraunic mapIDensity of lightning strikes on the ground Ng (strikes/year · km2)PROTECTEDEQUIPMENTSPDUpUeUp UeI: peak currentUp: voltage protection level. Residual voltage at In.Ue: impulse voltage the equipment can withstand4 Mersen Surge-Trap Solutions 180 Level of risk4-

Protection system of coordinatedstages: Type 1, 2 and 3 SPDsThe SPDs of a surge protection system must be able towithstand the discharged current and provide a Ureslevel (residual voltage) lower than the Ue peak voltagethat the equipment can withstand.Most of the times it is not possible to achieve this withjust one SPD, especially because the intensity ofthe surge is not known, and because of the inductionof overvoltages when conductors exceed 10m.Main switch boardThe optimal system of protection is the 3-STEPapproach, in which successive stages are combinedin the performance of high discharge capacitydevices and devices with an optimal voltageprotection level (low). This is addressed by thedefinition of “Types” or “Classes” of SPDs accordingto the type of transient pulses to which each protectedzone in the installation is subject to.Distribution boardSTEP 1STEP 2Final sub-circuitsIndividual equipmentSTEP 3sensitiveequipmentOvervoltage categoryIEC 60364-4-443IVIIIIIIOvervoltage withstand(Ue) values forequipment at 230/400V6kV4kV2,5kV1,5kVType 1 / Class IType 2 / Class IIIEC/EN 61643-11DefinitionLPZ IEC 62305-4protection zoneClass test toIEC/EN 61643-11Designed for use in incoming power supply panelswhere the risk of lightning strike is high, in particularin buildings with an external lightning protectionsystem. Must be accompanied by downstream ClassII protectors.LPZ 1Voltage protection level(Up)LPZ 2Always installed downstream of a Class II protectiondesigned to protect sensitive equipmentor equipment located more than 20m downstreamof the Class II SPD.LPZ 310/350μs waveform, Class I test.8/20μs waveform, Class II test.Combined 1.2/50μs-8/20μs waveform Class III test.Direct impact of a lightning strike (current).Indirect impact of a ligthning strike on thedistribution line (overhead lines) or its vicinity(rise of ground potential or induction by couplingof electromagnetic radiation of the strike) or in theevent of a switching.Indirect impact simulated by the currentand voltage that can reach the long-distance circuitsand individual equipment to be protected.SurgeDischarge capacity(Iimp, Imax)Designed for use in distribution panels locateddownstream of class I protectors or in incomingpower supply panels in areas with low exposureto lightning strikes, where the building is not fittedwith an external LPS.Type 3 / Class IIIHighMedium(Coarse)(Fine)Low(Very fine)STM T1MersenSurge-Trap seriesSTP T12STP T2; STP T2 PVSTP T23; STM T23 S; STL T23; STE T23Mersen Surge-Trap Solutions 5

S U R G E -T R A P R A N G E OV E RV I E WFIRST STEP OFPROTECTION 50kACOMBINEDTYPE 1 2WIDE RANGEPV EN 50539-11UL 1449STM T1STP T12STP T2STP T2 PVSee page 12See page 13See page 18See page 21LocationFirst step of protectionFirst step of protectionSecond step of protectionFor DC photovoltaic applicationsSPD TypeType 1 lightning current arresterto IEC/EN 61643-11Type 1 2 SPD to IEC/EN 61643-11Type 2 SPD to IEC/EN 61643-11Type 2 SPD to UL 1449 4rd Ed.Type 2 DC to EN 50539-11UL 1449 3rd Ed. recognisedIimp(10/350μs)50kA (phase) / 100kA (N-PE)12.5kA / 25kA50kA / 100kA40kA40kA50kA (phase) / 100kA (N-PE)20kA / 25kA20kA20kASpecialfeaturesIfi 50kA follow current interrupt rating.Multi-sparkgap technology.Leakage current free.ELV: Extra Low Voltage models available.Reversible & coded cartridges.ELV: Extra Low Voltage models available.Reversible & coded cartridges.Iscpv 10kA (no back-up fuse needed).SCCR 100kA and 50kA.Reversible & coded cartridges.Supply voltageUn (L-N/L-L)120/208V, 230/400V, 277/480V60V120/208V, 230/400V, 277/480V400/690V48V, 60V120/208V, 230/400V, 277/480V400/690V above65Vdc, 80Vdc660Vdc, 1060Vdc1200Vdc, 1500VdcNetworkconfigurationTNS, TNC, TTFormatDIN-rail mountable. Monobloc formatDIN-rail mountable. Pluggable formatTYPE 1TYPE 1 2Imax (8/20μs)In (8/20μs)Uoc (1.2/50μs)Type accordingto EN 61643-116 Mersen Surge-Trap SolutionsSingle phaseSplit phase3-phase WYE; DeltaTNS, TNC, TT, ITSingle phaseSplit phase3-phase WYE; DeltaTNS, TNC, TT, ITSingle phaseSplit phase3-phase WYE; DeltaDIN-rail mountable. Pluggable formatPV (DC side)DIN-rail mountable. Pluggable formatTYPE 2

O N E S O L U T I O N F O R E V E R Y S T E P O F P R OT E C T I O NFINE PROTECTIONSLIM: SPACESAVINGPOWERFULEMI FILTERLED STREET-LIGHT10kVSTP T23STM T23 SLIMSTE T23 EMISTL/STLB T23 LEDSee page 22See page 25See page 26See page 27Final stage of protection (very fine)Final stage of protection (very fine)Final stage of protection (very fine)For installation in the pole or OEM in theluminary of outdoor LED lighting systemsType 2 3 SPD to IEC/EN 61643-11Type 2 3 SPD to IEC/EN 61643 -11Type 2 3 SPD to IEC/EN 61643 -11Type 2 3 SPD to IEC/EN 61643-11,with CB scheme.Luminary “surge tested” and certified(optional)20kA20kA / 6kA20kA10kA10kA10kA / 3kA10kA5kA10kV10kV / 6kV6kV10kVPLC: Power Line Communication friendlysolutions (LCF).Reversible & coded cartridge.Ideal for limited spaces (1 module).Filter attenuation up to 82dB (common mode)vs electromagnetic disturbances.Rated current load up to 20A.Class 1 and Class 2 luminaires.Miniature size and easy to install.120/208V, 230/400V, 277/480V400/690V12V, 24V, 48V, 60V, 120V, 230VAlso for use in DC voltage applications120V, 230V230V (Contact us for other voltages)Single Phase TT, TNSSingle Phase TT, TNSSolutions for all types of electrical grids(configurations and voltages)DIN-rail mountable. Monobloc formatDIN-rail mountable. Monobloc formatHardwiredTNS, TNC, IT, TTSingle phaseSplit phase3-phase WYE; DeltaDIN-rail mountable. Pluggable formatTYPE 2 3kADischarge capacityApprovals / StandardsMersen Surge-Trap Soluti