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Quick Details

  • Place of Origin: Shanghai, China (Mainland)
  • Brand Name: LERDN
  • Model Number: LDY-40B+C
  • Certification: ISO9001/140001/CE/ROHS
  • Business Mode: OEM/Manufacturer/Export
  • Function: Lightning Protection for Lower Voltage
  • Class to IEC 61643-1: Class I Class II
  • Class to EN 61643-11: Type 1
  • Class to VDE 0675: B

Packaging & Delivery

Packaging Details Standard Export Packing By Air With TNT ,DHL,FEDEX,UPSExpress.
Delivery Time Lead Time Within 1-5 Days After Receiving Payment 100% By T/T
Product Description


Surge Protector LDY-40B+C


Application range:


LDY-30B 40B 60B  surge protector series are applied to equipotential bonding of the main low voltage distribution boxes in the building, providing overvoltage protection arising from the class B lightning strike to power supply system or misoperation. (Option from standard IEC61643- 1 and GB50343).


Main Feature:

  1. Plug and play design, live-wire replacement, easy maintenance;
  2. Build-in temperature control circuit breaker, high security performance;
  3. Green light in notice window indicates normal; red indicates broken, replacement notice, which is clear and easy distinguished;
  4. Optional telesignalling monitoring interface, realizable remote monitoring;
  5. Function of lightning protection backup, half of protection ability is available while either red light on;
  6. Assembled 1P, 1P+N, 2P, 3P, 3P+N, 4P etc modes, applied to various electric network systems.


Surge Protector Main technical data:









Max. continuous operating voltage Uc V











Voltage protection level Up kV







<1.7      <2.0    <2.2 


<2.0 <2.3<2. 5


Residual voltage at 5kA(8/20 μs) Ures  







<1.0,    <  1.2,      <1.4 


<1.0 <1.2  <1.4 


Nominal discharge current In (8/20μs) kA







Max. discharge current Imax (8/20μs) kA







Leakage current 75%Uc 1mA

≤ 20 μA






Response time tA

< 25 ns

< 100 ns

< 25 ns

< 100 ns 

< 25 ns


< 100 ns  

Protection modes

1P, 1P+N, 2P, 3P, 3P+N,4P

Housing material

Enhanced flame retardant nylon (UL 94V-0)

Max. backup fuse/air-break switch

125A gL/63A


≥ 16 mm2 stranded/flexible conductor

Requirment Class to IEC61643-1 

Class II 




Schematic Diagram:


  Surge Protector LDY-40B+C


Surge Protector  LDY-30B 

 Surge Portector LDY-60B

We are manufacturer :



CE Certificate and ISO Certificate



Company Information

  Shanghai LERDN was established in 2004 and is a fast-growing and dynamic young company which specializes in manufacturing a complete range of surge arresters. The headquarter and the factory are located in Shanghai, and has established representative offices in the USA and Hong Kong, and signed with six countries’ agents as sole agents at a national level. In China, LERDN has seven branches and fifteen sole agents at the provincial level.


Our Services


LERDN endeavors to research and manufacture electric safety protective products, which mainly includes two series:

  1. A complete range of surge protective devices
    • Surge protective devices for low voltage DC/AC power supply systems
    • Surge protective devices and combiner boxes for photovoltaic systems
    • Surge protective devices for data and signal control systems
  2. Equipments for Intelligent safety monitoring system                      

Related produts:


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