Application range:

LDY-40B surge protective device 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.

Main technical data:

Type
LDY-40B
LDY-40B/NPE

Max. Continuous operating voltage Uc V
275
385
420
255

Part No.
081402
081403
081404
081400

Voltage protection level Up kV
<2.0
<2.2
<2.5
<1.2

Nominal discharge current In (8/20μ S) kA
40
40

Max. Discharge current Imax (8/20μ S) kA
80
80

Leakage current 75%Uc 1mA
≤ 20 μ A
--

Response time tA
< 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

Cross-section
≥ 16 mm2 stranded/flexible conductor