Iskra Zascite

SMH2-20 SeriesDATA/SIGNAL LINES PROTECTIONIEC category / EN type: C1/C2/C3 (IEC 61643-21)Design:Replaceable plug-in moduleCoarse Protection:3 terminal GDTNom. Operating Voltage U n:24, 60, 230VDCMax. Operating Voltage U c: 28, 64, 320V DC respectivelySurge Discharge Ratings: I n: 10kA 8/20µs, I max: 20kA 8/20µsSeries load current:145mA, (5A for 230V version)Safety: PTC I > 0.3A (24 and 60V versions)Enclosure:DIN 43880 2/3TE, DIN rail mountTerminals:Multi-strand to 4mm 2The SMH2-20 series of low voltage protective devices has been developed as a generic protector for low voltageapplication and provides both common (longitudinal) mode and differential (transverse) mode protection.Coarse protection is provided using a three terminal gas discharge tube while fine protection is provided using ahigh speed silicon or metal oxide varistor stage.Over current protection is provided using a PTC element, which provides a level of protection against short circuitfault conditions.If the module is unplugged out of the base, the connection lines remain enabled.Technical characteristicsTypeProtection constructionNumber of protected pairsNominal operating voltageMax. continuous operating voltageRated spark overvoltageUnUc(a/b-PG)(a-b)Rated operating current at 25oCI LNominal discharge current (8/20µs) I nMax. discharge current (8/20µs) ImaxResidual voltage at 5 kA (8/20µs) (line-line)Response time of overvoltage protection t AOvercurrent protectionInsulation resistance of the protectionSerial resistance RTransverse capacitance CTerminal cross sectionOperating temperatureDegree of protectionHousing materialDimensions DIN 43880Mounting EN 60715Ordering code Base + Replaceable plug-in moduleReplaceable plug-in moduleSMH2-20K230V230V DC320V DC350V - 504V351V - 429V5A10kA20kA< 450V< 25ns/≥ 320MΩ< 0.1Ω< 1nFMulti-strand to 4 mm 2-40oC … +80oC708 160708 163SMH2-20D24VTwo parts: base + replaceable plug-in module2 (4 conductors)24V DC28V DC350V - 504V30V - 36V145mA10kA20kA< 65V< 1nsPTC resistors at I > 0.3A≥ 28MΩ9-11Ω< 3nFMulti-strand to 4 mm 2-25oC … +50oCIP 20Thermoplastic; gray extinguishing degree V-O2/3TEon a 35mm DIN rail708 161708 164SMH2-20D48V60V DC64V DC350V - 504V67V - 85V145mA10kA20kA< 135V< 1nsPTC resistors at I > 0.3A≥ 64MΩ9-11Ω< 1.2nFMulti-strand to 4 mm 2-25oC … +50oC708 162708 165Dimensional drawingsConnection diagramGDTMOVSMH2 20K85badcLINEGDTMOVa b c d d’ c’ b’ a’d’c’EQUIPb’a’GDTPTCBDSMH2 20DPTC9012PGLegend:PTCGDTBDMOVPGPGresistor with a positive temp. coeficientgas discharge tubebi-directional TVS diodevaristorprotective groundingPGbadcLINEGDTBDPTCPTCa b c d d’ c’ b’ a’PGd’c’EQUIPb’a’36www.iskrazascite.si