Principle and Function of Signal Surge Protective Device

Working Principle of Signal Surge Protective Devices

Signal surge protective devices form a protective barrier by connecting in series between the signal channels and the equipment. When a surge voltage appears on the signal channel, the surge protector quickly diverts the excessive voltage to the ground through its internal protection components (such as varistors, gas discharge tubes, diodes, etc.), preventing voltage fluctuations from damaging the equipment.

By effectively absorbing and diverting surge currents, signal surge protective devices can shield equipment from electrical interferences such as lightning, power system overvoltage, and induced overvoltage, ensuring stable signal transmission and prolonging the lifespan of the equipment.

Primary Functions of Signal Surge Protective Devices

Signal surge protective devices play the following key roles in electronic systems:

Limiting Transient Overvoltage Caused by Induced Lightning

Induced lightning is one of the main causes of damage to electronic systems from lightning strikes, accounting for over 80% according to statistics. Installing signal surge protective devices can effectively limit the transient overvoltage caused by induced lightning, safeguarding electronic equipment.

Suppressing Surges Caused by Electronic System Operations

The start and stop operations of electronic equipment are another major source of surges in signal lines. Such operational surges commonly affect lines and equipment, especially sensitive components, which may deteriorate or fail. Signal surge protective devices can effectively reduce such surge phenomena, enhancing system stability and prolonging equipment lifespan.

Recommendations for Choosing Signal Surge Protective Devices

• Signal Type and Operating Voltage: Choose a suitable surge protector based on the operating voltage of the system signal.

  
  

• Operating Current (IL) of the Circuit: Ensure that the signal surge protective device can withstand the operating current of the circuit.

  
  

• Number of Protected Lines: Select the corresponding protector based on the number of signal circuit lines (2-wire, 3-wire, 4-wire).

By considering these factors, the safety of signal transmission can be effectively ensured, and overvoltage damage to equipment can be avoided.