The development of economy has promoted the rapid development of Power over Ethernet (POE). The development of this technology simplifies the installation and deployment of electrical equipment, thus eliminating the need for independent transmission lines. Nowadays, Power over Ethernet (POE) technology is widely used in industrial systems such as security, communication and smart grid to complete data, video transmission, flow control in the system. However, due to the harsh working environment of industrial Ethernet, surge and electrostatic protection of POE ports are essential. The following is our protection solution for POE systems.

Background：

1. Global warming, more thunderstorms

2.The difficulty of protection is increased by the coexistence of Poe power supply and signal

SOCAY's Protection Solution and Electronics Components：

Gas Discharge Tubes(GDTs)

GDT【SC1812-300CSMD】DC Spark-over Voltage：300±20%V，Nominal Impulse Discharge Current（8/20μS）：2kA，Maximum Capacitance＜1.0pF，Minimum Insulation Resistance＞1GΩ；

TVS Diode 

TVS1【ESD03V32D-LC】Vrwm：3.0V；Vb：4.0V；Vesd：8KV/15KV；Ct（f=1MHz）：1.2pF；Package: SOD-323; Fast response time.

TVS2【SMCJ58CA】Vbr：64.4-71.2V；Ir：5μA；Vrwm：58.0V，Ipp：16.1A；Vc (V) :93.6V; Package：SMC/DO-214AB

Varistor(MOV)

MOV【10D820K】Varistor Voltage（at1mA）：74V-90V，Withstanding Surge Current（8/20μS）：2500A，Maximum Clamping Voltage（at5A）：135V;

Application:

1. POE power supply

2. POE separator

3. POE connector

4. AP

Solution Note:

1.In this solution, GDT is used for common mode (eight wire) surge protection at the front of transformer

2. The back end of the network transformer uses tvs1 with small volume and low junction capacitance to absorb differential mode energy

3. The TVS has fast response time and anti-static function

4. The solution complies with the 802.11 electrical standard

5. The solution meets the surge test standards such as IEC61000-4-5 and GBT17626.5

6. The solution meets the electrostatic test standards such as IEC61000-4-2 and GBT17626.2

7. The solution can pass 10/ 700μS (internal resistance 40ohm) and 1. 2/ 50-8/ 20μS surge test

To learn more about circuit protection solution, please directly enter the website of SOCAY to consult online customer service http://www.socay.com/