AC Surge Protective Device

AC Surge Protector (SPD)Manufacturer

Leikexing Electric is a professional manufacturer of surge protectors, specializing in the production of high-quality surge protectors (SPDs).
Leikexing Electric has 8 years of experience in the production of surge protectors, with an annual output of nearly 5 million surge protectors (SPDs).
Leikexing Electric always puts customers at the center and takes product quality as the core concept, providing the highest quality products (SPD) and the most satisfactory services.

AC surge protection device (SPD) types

Leikexing series single-phase/three-phase AC surge protector

According to IEC 61643-1:2011 and EN 61643-1:2012+A1:2018, there are three different types of surge protection devices (SPDs): Type 1, Type 2, and Type 3.

Voltage switch type:

It is in a high impedance state when there is no instantaneous overvoltage, and suddenly changes to a low impedance state when a surge occurs, effectively diverting the surge current to ground and protecting the equipment from overvoltage damage.

Voltage limiting type:

It exhibits a high impedance state when there is no surge, but as the surge current and voltage increase, the impedance will continuously decrease, limiting the voltage to a safe level and avoiding damage to the equipment caused by overvoltage.

Combination type:

Combining voltage switch type and voltage limiting type, it has both voltage switch function and voltage limiting function, which can simultaneously limit transient overvoltage and discharge surge current, providing better protection effect.

Type 1 Surge Protector (SPD)

Leikexing series single-phase/three-phase AC type 1 power lightning arrester

Type 1 surge protectors are commonly used at the power inlet of buildings, mainly to cope with large-scale overvoltage caused by lightning or external environmental factors. Its main function is to cut off most of the lightning current, thereby reducing the surge current entering the next level of protection.

Type 1 Surge Protector (SPD)

Leikexing series single-phase/three-phase type 1 ac surge protector

The key parameters of Type 1 surge protector include: surge current Iimp, maximum continuous operating voltage Uc, voltage protection level Up, and response time tA. These parameters are crucial for evaluating and selecting the performance of surge protectors.

Specification parameters:

◆ Type 1/T1/Class B

◆ Nominal voltage U_n: 230V 400V

◆ Max. continuous operating voltage U_c: 275V/320V/385V/440V

◆ Nominal discharge current (8/20 μs) I_n = 25kA Type 2

◆ Impulse discharge current (10/350 μs) I_imp = 25kA Type 1

◆ Maximum discharge current (8/20 μs) I_max = 100kA Type 2

Wiring Diagram & Installation

Leikexing series single-phase/three-phase type 1 ac surge protector

Type 1 surge protector should be installed in the building’s main distribution box or outdoor distribution cabinet. Type 1 surge protectors are usually installed at the entrance of low-voltage distribution systems, close to the protected equipment, to shorten the protection path, reduce the attenuation of surges during transmission, and improve protection efficiency.

Type 1+2 Surge Protector (SPD)

Leikexing series single-phase/three-phase type 1+2 ac power surge protector

Compared to Type 1 surge protectors or Class 2 surge protectors, Type 1+2 surge protectors have a wider range of applicable installations. The 1+2 type surge protector is suitable for installation in areas below the LPZ0B partition level. It has a large current capacity while also ensuring low voltage protection level. Compared with the 1 type surge protector, it has stronger voltage limiting ability, and compared with the 2 type surge protector, its current capacity is much larger. It is more suitable for lightning protection of equipment facing direct lightning hazards and low voltage resistance.
Whether it is a 1+2 type surge protector or a simple 1 or 2 type surge protector, a lower voltage protection level is important to achieve lightning protection.

Type 1+2 Surge Protector (SPD)

Leikexing series single-phase/three-phase ac spd type 1+2 surge protector

Type 1+2 combination lightning arrester has the characteristics of fast response time and low residual voltage. This means that when lightning strikes, it can quickly react and limit overvoltage within a safe range.

Specification parameters:

◆ Type 1+2/Class Ⅰ+Ⅱ/Class B+C

◆ Nominal voltage U_n: 230V 400V

◆ Max. continuous operating voltage U_c: 275V/320V/385V/440V

◆ Nominal discharge current (8/20 μs) I_n = 20kA Type 2

◆ Impulse discharge current (10/350 μs) I_imp = 6.25kA、25kA Type 1

◆ Maximum discharge current (8/20 μs) I_max = 40kA Type 2

◆ Protective elements: Metal Oxide Varistor (MOV), Gas Discharge Tube (GDT)

Type 2 AC Surge Protector (SPD)

Leikexing series single-phase/three-phase type 2 ac surge protector

Type 2 surge protectors are usually installed at the lightning protection boundary between LPZ1 and LPZ2 zones or beyond, such as floor distribution boxes, meter boxes, or terminal boxes. Its main purpose is to further protect critical or sensitive electrical equipment by limiting voltage to prevent transient overvoltage from causing damage to the equipment. The Type 2 surge protector should be a voltage limiting type, with a lightning current capacity of not less than 20KA. It should be installed at critical or sensitive electrical equipment to absorb more of the remaining surge and have good suppression effect on transient overvoltage.

Type 2 Surge Protector (SPD)

Leikexing series single-phase/three-phase type 2 ac power surge protector

Specification parameters:

◆ Type 2/T2/Class C

◆ Nominal voltage U_n: 230V 400V

◆ Max. continuous operating voltage U_c: 275V/320V/385V/440V

◆ Nominal discharge current (8/20 μs) I_n = 10kA 20KA 30KA 40KA 60KA 80KA Type 2

◆ Impulse discharge current (8/20 μs) I_max = 20kA 40KA 60KA 80KA 100KA 120KA Type 2

◆ Protective elements: Metal Oxide Varistor (MOV), Gas Discharge Tube (GDT)

AC surge protector dimensions

Leikexing series single-phase/three-phase type 2 ac power surge protector

Quick response: The Type 2 surge protector can detect and respond to overvoltage in a very short period of time, ensuring timely protection of electronic devices in the event of overvoltage impact.

◆ High voltage resistance: Type 2 surge protector can withstand large transient currents and voltage surges, protecting electronic devices from damage caused by overvoltage.

◆ Low residual voltage: After the surge protector is activated, the residual voltage of Type 2 surge protector is lowered to ensure the safe operation of the protected equipment.

Reusable: It usually has the characteristic of being reusable, as long as the protector itself is not damaged, it can continue to play a protective role.

High quality surge protector

The main components of the AC power surge protector are made of high-quality copper, plated with 4 μ nickel to prevent salt spray, and have good conductivity and excellent product performance.
Module insertion and extraction type, displaying red fault and green normal, optional remote alarm.
It has isolation function, which can prevent incomplete separation caused by pulling out the solder wire during the thermal trip process. This product can quickly and effectively cut off the arc.
The product shell is made of PA66 thermal insulation and flame retardant material, effectively preventing fires from occurring.
DIN rail installation.

AC surge protectors Precautions

The precautions for AC surge protectors mainly include the following aspects:

1.Correct wiring:

When installing surge protectors, it is necessary to follow the manufacturer’s instructions for correct wiring, ensure that the wiring is firm and reliable, and follow appropriate safety standards and regulations.

2.Select appropriate level:

Choose the appropriate level of surge protector based on the required protection level and system characteristics. Different application scenarios may require different levels of surge protectors to protect devices from varying degrees of overvoltage.

3.Regular inspection and maintenance:

Regularly check the working status of surge protectors and conduct maintenance and testing to ensure their normal operation. Replace aged or damaged surge protectors and ensure that the installation location is clean and tidy.

4.Avoid physical damage:

Avoid physical damage to surge protectors, such as compression, collision, or water immersion. Ensure the safety of the installation location of surge protectors and take appropriate protective measures to prevent unnecessary damage.

5.Professional installation:

It is best to have experienced electricians or professionals install and maintain surge protectors to ensure safety and effectiveness.

6.Grounding wire requirements:

The grounding wire of the surge protector should be reliably connected to the system protection grounding, and the diameter of the connecting wire should not be smaller than the small section requirement of the grounding wire. Multiple stranded copper wires should be selected as the grounding wire for surge protectors, rather than single stranded copper core wires.

7.Wiring requirements:

A certain distance should be maintained between protected and unprotected lines, or shielded devices should be used for isolation to prevent unprotected lines from inducing lightning surge voltage to protected lines.

8.Installation location:

The installation location of surge protectors should be reasonably selected, for example, they should be installed near the main equipotential connection section of the building’s entrance line, and secondary and tertiary surge protectors should be installed around the protected equipment.

9.Multi level protection:

In order to limit the inductive coupling between the protected part and the unprotected equipment part after installation, certain measurements are required. By separating the induction source from the sacrificial circuit, selecting the loop angle, and limiting the closed loop area, mutual inductance can be reduced.

By following these precautions, it can be ensured that AC surge protectors effectively protect electrical systems and equipment from overvoltage damage.