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    Item No.: LYB-12.5/275 3(S)+1

    LY1-B25/3(S)+1 MONOBLOCK MULTI-POLE SPD

    Description：

    Class 1·Class II·Type 1·Type 2
    Location of Use: Main Distribution Boards
    Network Systems:TT, TN-S
    Mode of Protection: L-N/ L’-N,N-PE
    Surge Ratings: limp = 25 kA/ 100 kA(10/350 μs)
    In = 25 kA/ 100 kA(8/20 μs)
    IEC/EN Category: Class 1+11 / Type 1+2
    Protective Elements: High Energy MOV and GDT
    Housing: Monoblock Design
    Compliance:IEC 61643-11:2011
    EN 61643-11:2012

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      The 100kA 3P+N GDT AC surge protective device is a high-performance product designed for three-phase + neutral AC systems.
      It adopts graphite arc gap discharge, MOV ZnO, and GDT protection, ensuring fast response and high reliability during lightning strikes or transient voltage surges.
      Built from PVC/PA66/PBT flame-retardant housing, certified by CE and TUV, and manufactured under IEC 61643-11:2011 / EN 61643-11:2022 standards.
      As a factory OEM/ODM manufacturer, we offer bulk buy, in bulk, and wholesale services for global customers.

      Applicable scenarios / Application industries

      Compatible with 35mm DIN rail, it’s widely used in solar power systems, AC distribution boards, industrial control boxes, and building lightning protection networks.

       

      ■ Technical Data
      IEC Electrical 150 275 320 385
      Nominal AC Voltage (50/60Hz) Uo/ Un 120 V 230 V 230 V 230 V
      Maximum Continuous Operating Voltage (AC) (L-N) Uc 150 V 275 V 320 V 380V
      (N-PE) Uc 255 V 255 V 255 V 255 V
      Nominal Discharge Current (8/20 μs) (L-N) / (N-PE) In 25 kA /100 kA
      Maximum Discharge Current (8/20 μs) (L-N) / (N-PE) Imax 100 kA
      Impulse Discharge Current (10/350 μs) (L-N) / (N-PE) Iimp 25 kA / 100 kA
      Total Discharge Current (10/350 μs) Itotal 100 kA
      Specific Energy (L-N) / (N-PE) W/R 156 kJ / Ω / 2.5 M kJ / Ω
      Charge (L-N) / (N-PE) Q 12.5 As / 50 As
      Voltage Protection Level (L-N) / (N-PE) Up 1 kV / 1.5 kV 1.5 kV / 1.5 kV 1.6 kV / 1.5 kV 1.8 kV / 1.5 kV
      (N-PE) Ifi 100 ARMS
      Response Time (L-N) / (N-PE) tA < 25 ns / < 100 ns
      Back-Up Fuse (max) 315 A gL / gG
      Short-Circuit Current Rating (AC) (L-N) ISCCR 50 kA
      TOV Withstand 5s (L-N) UT 180 V 335 V 335 V 335 V
      TOV 120min (L-N) UT 230 V 440 V 440 V 440 V
      TOV Withstand 200ms (N-PE) UT 1200 V
      Number of Ports 1
      Mechanical & Environmental
      Operating Temperature Range Ta -40ºF to +158ºF [-40ºC to +70ºC]
      Permissible Operating Humidity RH 5%…95%
      Atmospheric pressure and altitude 80k Pa … 106k Pa / -500 m…… 2000 m
      Terminal Screw Torque Mmax 39.9 Ibf·in[4.5 Nm]
      Conductor Cross Section (max) 2 AWG (Solid, Stranded) / 4 AWG (Flexible)
      35 mm² (Solid, Stranded) / 25 mm²(Flexible)
      Mounting 35 mm DIN Rail
      Degree of Protection IP 20 (built-in)
      Housing Material Thermoplastic: Extinguishing Degree UL 94 V-0
      Thermal Protection Yes
      Operating State / Fault Indication Green ok / Red defect
      Remote Contacts (RC)
      RC Switching Capacity
      RC Conductor Cross Section (max)      		 Optional
      AC: 250V / 0.5 A; DC: 250V / 0.1 A;125V / 0.2 A;75V / 0.5 A
      16 AWG (Solid) / 1.5 mm²(Solid)

      ■ Internal Configuration


      ■ Dimensions & Packaging


      ■ Connection Diagram

      FAQ for LY1-B25/3(S)+1 MONOBLOCK MULTI-POLE SPD

      1. What applications is the LY1-B25 3S+1 suitable for?
      This multi-pole SPD is designed for three-phase AC systems, industrial machinery power inputs, pump control panels, and large distribution boards.

      2. What surge-handling components does it use?
      It uses high-quality MOV (ZnO) varistors that provide stable and consistent protection against repeated surges.

      3. Is this model certified for global use?
      Yes, it complies with IEC 61643-11:2011 / EN 61643-11:2022 and carries CE and TUV certifications for international projects.

      4. What makes the monoblock structure advantageous?
      The one-piece monoblock design increases thermal stability, prevents loose electrical contacts, and enhances long-term durability.

      5. Does the LY1-B25 3S+1 support large wholesale orders?
      Yes, we are a professional factory offering bulk orders, OEM/ODM production, distributor service, and long-term supply.

      6. Can it be installed using a standard DIN rail?
      Yes, the SPD mounts directly onto 35 mm DIN rails used in AC panels.

      7. Does this SPD include an operation status indicator?
      Yes, it features a front-panel visual indicator to show protection and failure status.

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      We offer a full range of customised services, working closely with our customers every step of the way, from concept design to final delivery.

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