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Lightning rods on buildings usually only prevent direct lightning strikes, and the strong electromagnetic field and pulse voltage induced by lightning can still threaten the stable operation of network communication equipment. Instantaneous high-voltage lightning surges are usually the main cause of instability in network switches. The main sources of surge voltage in network signal systems include induced lightning strikes, electromagnetic interference (EMI), radio frequency interference, and electrostatic interference. Surge is not only caused by lightning; They may also occur due to short-circuit faults in the power system or the operation of high-power loads. Given the wide coverage of the power grid, lightning strikes hundreds of kilometers away can still generate surges that, after attenuation through substations and other infrastructure, may retain thousands of volts when they reach your network devices. Although these high-voltage surges only last for tens to hundreds of microseconds (usually not enough to damage network switches), they can cause serious damage to internal components. As this damage accumulates, the stability of network switches deteriorates.

Therefore, designing high-voltage surge resistant Ethernet switch OEM is crucial. The industrial network switch of Beijing Fibre includes anti lightning surge circuits based on varistors, transient voltage suppression (TVS) diodes, and ceramic gas discharge tubes. The entire circuit includes protection for network ports and power circuits. This protection circuit combines TVS diodes, varistors, automotive grade ceramic gas discharge tubes, and surge suppressors to form a composite circuit that provides comprehensive common mode and differential mode protection. This design ensures instantaneous discharge of high-voltage surges and effectively protects industrial network switches.

In the circuit, varistors are connected in series with ceramic gas discharge tubes to extend their service life and ensure safety. Select automotive grade ceramic gas discharge tubes based on the required current processing capability. In the power supply section, wire wound resistors are used for current limiting and voltage division. Multiple high-voltage filtering capacitors (represented as * C *) are connected to the ground of the power supply, and decoupling capacitors (represented as * Y *) are also used. Resistors (* R *), capacitors (* C *), and diodes (* VD *) form an absorption clamp circuit for MOSFETs used in switching power supplies, thereby protecting the chip. This lightning and surge protection circuit has been proven to be very effective in practical applications.

The lightning protection circuit based on TVS diodes, varistors, ceramic gas discharge tubes, and automotive grade surge suppressors is widely used in the industrial DIN rail switch of Beijing Fibrodge. It has demonstrated excellent performance in practical applications and has successfully passed various domestic and international tests. Protect your network switch with Fibre's anti surge solution.