LDY-63T decouplers are connected in series on the low-voltage power system of nominal voltage below 500V,which is used to increase the wire inductive reactance, offset the shortage of wire length,and coordinate the adaptation among surge protector of different specification.The typical application is that the class B and class C surge protection devices installed in the same power distribution cabinet. When the length between voltage switching protector and voltage limiting protector is less than 10m,or the length between limiting protectors is less than 5m, the decoupler should be added between the different class protectors.

As the decoupler is connected in series in the circuit,we should choose the suitable decoupler according to the load current in the circuit.(option from standard IEC61643-1 and GB50343)

The decoupler has excellent inductive characteristics against transient high-energy lightning current and ensure the surge protection device reliable action when the lightning strike occurs. if there are some surge protection device in circuit, they will interact each other, that mean, the energy should be balanced between protectors in parallel connection. the result of balance is that when a surge voltage occur arising from lightning strike, the protector (class B) will reliably response and take the high energy away, in order to protect other protectors (class C or class D).