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Quick Details

  • Place of Origin: Shanghai, China (Mainland)
  • Brand Name: LERDN
  • Model Number: LDY-30A
  • Class: B
  • Certification: ISO9001/14001/CE/ROHS
  • Iimp: 30kA

Packaging & Delivery

Packaging Details Standard export packing
Delivery Time Lead time within 3 days after receiving payment


Surge Reduction Filter
1. LDY-30A
2. Iimp: 30kA, Un: 230V
3. Up: <0.8kV, Uc: 255V
4. Rated breaking afterflow current: 3kA

Surge Reduction Filter


Application range

LDY-30A/50A are applied to equipotential bonding of the low voltage side of transformer or main low voltage distribution boxes inside the building, providing protection against the overvoltage arising from the lightning strike to power supply system of class I or faulty operation, but they are not applied to the system of the expected short-circuit current beyond rated breaking afterflow current. The series fuse must be at the front-end of the product, otherwise, the surge protector may be burned out by the developed power flowcurrent, while the product is discharging. (Option from standard IEC61643-1 and GB50343)


Main Feature

The two electrodes are connected to the line L (or line N) and line PE respectively. An electric gap is formed between the two electrodes. The high-impedance state exists between the two electrodes when the electric network runs under the striking voltage. If the voltage between the two electrodes surpasses the striking voltage arising from the lightning or faulty operation on the electric network, arc through the electric gap and power energy releases through arc discharge. The arc will be extinguished by the arc quenching system consisting of detached arc slices and arc quenching room and the electric gap resumes to high-impedance state. The discharge gap is totally-enclosed and No arc escape.


Main technical data




Part No.



Impulse discharge current Iimp (10/350μs) kA



Rated load voltage Un V


Max. continuous operating voltage Uc V


Voltage protection level Up kV

< 0.8

Ability of anti-short-circuit of the Max. backup fuse


Rated breaking afterflow current


Insulating resistance

> 5MΩ

Response time tA ns

< 100

Protection modes

1P, 2P, 3P,4P

Housing material

Enhanced flame retardant nylon

(light gray, flame retardancy degree: V0)

Max. backup fuse/air-break switch

250A gL


≥ 16 mm2 stranded/flexible conductor

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