Surge Protection Solutions
for PV, Wind, EV Charging, Telecom and Industrial Systems
Select the right surge protective device according to application scenario, system voltage, installation position, grounding condition and IEC standards.
01 Understand common surge risks in different systems
02 Identify where SPDs should be installed
03 Compare AC, DC and signal line SPD applications
04 Send project parameters for product selection support
Solutions
Different systems require different SPD types, voltage levels, wiring structures and installation positions. Select your application scenario to view the recommended protection strategy.Common Surge Risks in Electrical and Electronic Systems
Lightning-induced surges, switching overvoltage and transient disturbances may damage inverters, distribution cabinets, communication equipment, control systems and sensitive electronic devices.
A proper surge protection strategy should consider power lines, DC lines, signal lines, grounding system and equipment sensitivity.
Lightning-Induced Surge
Outdoor cables and exposed systems may experience transient overvoltage caused by nearby lightning strikes.
Switching Overvoltage
Power switching, inverter operation and load changes can generate transient disturbances in the system.
Equipment Damage
Inverters, PLCs, sensors, cameras and communication modules are sensitive to transient voltage spikes.
System Downtime
Surge damage can cause production loss, maintenance cost, service interruption and project reliability issues.
General Surge Protection System Overview
SPDs should be installed at different protection levels, from the main power entrance to sub-distribution cabinets, terminal equipment and signal communication lines.
This is a general overview for the Solutions page. Each application page should include a more specific system diagram, such as PV array to inverter, EV charging station distribution, wind turbine tower system or telecom base station cabinet.
Power Supply
Grid, PV, wind, generator or DC source
Type 1
Main distribution board or power entrance
Type 2 SPD
Sub-distribution board or equipment cabinet
Signal SPD
Terminal equipment, RS485, data or CCTV line
Grounding System
Correct earthing connection for discharge path
Where Should SPDs Be Installed?
SPD installation position depends on the system structure, exposure level, equipment sensitivity and required protection level.
| Installation Position | Typical Application | Protection Purpose | Recommended SPD |
|---|---|---|---|
| Main Distribution Board | Building entrance, factory power system, main LV panel | Discharge high-energy surge current at the power entrance | Type 1 SPD |
| Sub-Distribution Board | Electrical cabinet, branch panel, control cabinet | Protect downstream electrical equipment from residual surge | Type 2 SPD |
| Terminal Equipment | PLC, controller, sensitive electronics, terminal devices | Provide fine protection close to sensitive equipment | Type 2 SPD |
| DC Side | Solar PV string, combiner box, inverter DC input, DC power system | Protect DC circuits from transient overvoltage | DC SPD / PV SPD |
| Signal & Communication Line | RS485, data line, CCTV, PoE, monitoring system, telecom line | Protect communication modules and signal equipment | Signal Line SPD |
How to Select the Right Surge Protective Device
Before selecting an SPD, confirm the system type, operating voltage, installation position, discharge current requirement, protection level and wiring mode.
| Selection Factor | What to Check | Example | Why It Matters |
|---|---|---|---|
| System Type | AC, DC, PV, signal, data or telecom line | Solar PV / EV charging / Telecom / Industrial cabinet | Different systems require different SPD structures and standards. |
| Operating Voltage | Uc / Un should match the system voltage | 385V AC, 1000V DC, 1500V DC | Incorrect voltage selection may cause SPD failure or insufficient protection. |
| SPD Type | Type 1, Type 2, DC SPD or signal SPD | Main panel uses Type 1 ; sub-panel uses Type 2 | The SPD type should match the installation location and risk level. |
| Discharge Current | Check In, Imax and Iimp values | Higher lightning risk areas may require higher discharge capacity | Discharge capacity affects the SPD’s ability to handle surge current. |
| Protection Level | Check Up value | Lower Up value provides better protection for sensitive equipment | Protection level determines the residual voltage reaching equipment. |
| Wiring Mode | Check pole number and system wiring | 1P, 2P, 3P, 4P | The SPD must match the electrical system configuration. |
Recommended SPD Product Categories
Find the right SPD category for your application, including AC power, DC power, solar PV, signal, telecom, and data line surge protection.
EV Charging Stations SPD->Type 2 / Class ll
Uc(V) :
AC385V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Mode of Protection:
LN,N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
AC Power SPD->Type 2 / Class ll
Uc:
AC385V/420V/440V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Mode of Protection:
L/N-PE; L-N, N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
CCTV & Security SPD
Uc(V) :
DC40V/AC320V
Un(V) :
DC24V/AC220V
In (8/20 μs):
10kA
Imax(8/20 μs):
20kA
Reference Standards:
IEC61643OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
Wind Power SPD->Type 2 / Class ll
Uc(V) :
AC760V/1500V
Un(V) :
AC690V/1140V
In (8/20 μs):
60kA
Imax(8/20 μs):
100kA
Mode of Protection:
L/N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
Specialized SPDs/Accessories
Test Class:
Type 1 / Class I; Type 2 / Class ll
Ue:
AC220V/380V
Ui:
AC400V
limp(10/350us):
25kA/15kA
Imax(8/20 μs):
100kA/80kA/65kA/40kA/20kA
In(8/20 μs):
60kA/40kA/35kA/20kA/10kA
Reference Standards:
NB/T 42150-2021OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
PV DC SPD->DC Power SPD
Un(V) :
DC600V/1000V/1200V/1500V
Uc(V) :
DC670V/1200V/1500V/1800V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Reference Standards:
IEC 61643-31OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingStandards Reference for Surge Protection Selection
Surge protection selection should follow applicable IEC standards and actual project requirements.
IEC 61643-11
AC Power SPD
Applies to low-voltage surge protective devices connected to low-voltage power systems.
IEC 61643-31
Photovoltaic DC SPD
Applies to surge protective devices used in photovoltaic DC installations.
IEC 61643-21
Signal & Telecom SPD
Applies to surge protective devices connected to telecommunications and signalling networks.
FAQ
How can I get a customized surge protection solution?
You can provide your system diagram, voltage level, equipment list, installation environment, and project requirements. CRESIN will recommend suitable SPD products and protection positions.
Does CRESIN provide wiring diagrams for solutions?
Yes. CRESIN can provide typical wiring diagrams and application guidance for different surge protection scenarios.
Can one project require multiple types of SPD?
Yes. A complete project may require AC SPD, DC SPD, signal SPD, telecom SPD, Ethernet SPD, and coaxial SPD depending on the equipment and system structure.
Do renewable energy systems need special surge protection?
Yes. Solar PV and wind power systems are often installed outdoors and exposed to lightning risk. They usually require coordinated surge protection on DC, AC, signal, monitoring, and communication lines.
Can CRESIN recommend SPD models for different systems?
Yes. CRESIN can recommend suitable SPD models according to the application scenario, installation position, system voltage, and protection level required.
What information is needed for a complete surge protection solution?
A complete solution usually requires system voltage, single-line diagram, grounding system, installation location, equipment type, cable route, lightning exposure level, and project standard requirements.
Why should surge protection be designed by application scenario?
Different systems have different voltage levels, cable routes, grounding structures, exposure risks, and equipment sensitivity. Therefore, surge protection should be designed according to the actual application scenario rather than using one universal SPD.
What surge protection solutions does CRESIN provide?
CRESIN provides surge protection solutions for solar PV systems, wind power systems, EV charging stations, power distribution systems, telecom networks, CCTV and security systems, and industrial automation applications.
Contact Us
The CSMS-A15 series AC power distribution system surge protector is designed according to IEC61643-11 and GB/T18802.11 lightning protection standards. It is suitable for AC 50Hz, 220V/380V and below TN-S, TN-C-S, TT, IT and other power supply systems.
Shandong Cresin Electric Co., Ltd. SEO CEGLOBAL Privacy Policy
Contact Us
Address: No. 978 Tianchen Road, High-tech Zone, Jinan, Shandong,China
CAN’T FIND THE PRODUCT?
The product range includes production technologies for smart capacitors, digital display meters, surge protectors, dedicated backup protection devices for surge protectors, self-resetting over/under-voltage protectors, control and protection switches, and automatic transfer switches for dual power supplies.
Search HistoryClear All Records
- 全部
- 产品管理
- 新闻资讯
- 介绍内容
- 企业网点
- 常见问题
- 企业视频