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What are the classifications of surge protectors?

What are the classifications of surge protectors: Surge protectors are often referred to as “lightning arresters” and “lightning protectors”. The English Surge protection Device is an important part of the internal lightning protection device, and it is also an important part of the lightning protection of electronic equipment. An indispensable device whose function is to limit the transient overvoltage that enters the power line and signal transmission line within the voltage range that the equipment or system can withstand, and it can also discharge the lightning current into the ground to protect the equipment or system Not damaged by lightning current.

From the perspective of the structure of a surge protector, it includes at least one non-linear voltage limiting element, and its basic components mainly include five components such as a discharge gap, a gas-filled discharge tube, a varistor, a suppression diode, and a choke coil. So what are the classifications of surge protectors? Junhe Electronic Surge Protector shares the following for you:

1. Classification according to the working principle of surge protectors

1. Switch type: Its working principle is that when there is no instantaneous overvoltage, it presents a high impedance, but once it responds to the lightning instantaneous overvoltage, its impedance suddenly changes to a low value, allowing the lightning current to pass. When used as such devices, the devices include: discharge gap, gas discharge tube, thyristor, etc.

2. Voltage-limiting type: Its working principle is high resistance when there is no instantaneous overvoltage, but its impedance will continue to decrease with the increase of surge current and voltage, and its current and voltage characteristics are strongly nonlinear. The devices used for such devices are: zinc oxide, varistors, suppressor diodes, avalanche diodes, etc.

3. Shunt type or choke type

Shunt type: in parallel with the protected equipment, it presents a low impedance to the lightning pulse, and presents a high impedance to the normal operating frequency.

Choke type: It is connected in series with the equipment to be protected, which presents high impedance to lightning pulses, and presents low impedance to normal operating frequencies.

The devices used for such devices are: choke coils, high-pass filters, low-pass filters, 1/4 wavelength short-circuit devices, etc.

2. Classification according to the purpose of the surge protector

(1) Power protector: AC power protector, DC power protector, switching power protector, etc.

(2) Signal protector: low-frequency signal protector, high-frequency signal protector, antenna feeder protector, etc.

In summary, when choosing a surge protector, you must make a detailed ratio and selection according to the actual situation on the site and the line type. Only by choosing a suitable surge protector can the effect of lightning protection be guaranteed.