An ac surge protector keeps your electrical devices safe from strong power surges. Surges can happen at home or at work. They can break your equipment very fast. Lightning, switching, and electrostatic discharges are common causes. Surges can also come from external physical contacts or problems with the power grid.
Source of Surge | Description |
|---|---|
Lightning strikes | Lightning generates very high, short-duration voltages that can damage electrical and electronic equipment. |
Switching operations | Turning devices or equipment on/off can create transient surges or strong electrical pulses. |
Electrostatic discharges (ESD) | Sudden voltage spikes occur when charged objects come close to or touch conductive surfaces. |
External power surges | Fluctuations in the power grid caused by load changes, transformer switching, or utility issues can induce surges. |
External Physical Contacts | Accidental contact with power or communication lines—such as from objects or debris—can create sudden voltage surges that may damage connected equipment. |
Key Takeaways
AC surge protectors keep your devices safe from voltage spikes. These spikes can happen because of lightning or switching. Other electrical problems can also cause spikes.
A whole house surge protector keeps all your devices safe. It protects everything in your home from power surges.
Surge protection is very important for your electronics. It helps stop damage, data loss, and fire risks.
Pick the right surge protector by looking at its main features. Check surge capacity, response time, and clamping voltage.
Always look at the status light on your surge protector. This helps you find problems early and make sure it works well.
Put surge protectors close to sensitive devices for better safety. This gives the best protection from surges.
Different places need different surge protectors. Homes and factories have their own special needs.
Find surge protectors with certifications like TUV. These show the surge protector is safe and reliable.
AC Surge Protector Basics
AC Surge Protector: Definition and Importance
An ac surge protector is a device that keeps electrical systems safe from sudden voltage spikes. You use it to protect your home or work equipment from power surges. Surges can happen when lightning hits, big machines turn on or off, or there are problems in the power grid. The ac surge protector works like a shield. It stops extra voltage from reaching your important devices.
With the proliferation of smart home appliances and precision industrial equipment, the stability of power systems has become paramount. Research indicates that 90% of electronic equipment failures are linked to voltage surges, while the installation of appropriate Surge Protective Devices (SPDs) can mitigate this risk by over 80%.
Consequently, the International Electrotechnical Commission (IEC) explicitly states: “Surge protection has become the standard configuration for modern power infrastructure.”
Why Surge Protection Is Essential
Surge protection is not just something nice to have. It is needed for homes and factories. Power surges can cause big problems. You might lose expensive electronics, lose data, or even have fire risks. In factories, surges can stop production lines, break networks, and interrupt services. These problems can cause legal trouble and make customers lose trust.
Surge protection devices help you avoid these problems. They keep your equipment working and lower downtime. Using ac surge protection means fewer failures that hurt many systems at once. It also makes it easier to find and fix problems because sudden damage is less likely.
Here are some reasons surge protection is important:
It stops damage to electronics.
It lowers the chance of losing data.
It helps prevent business problems.
It reduces fire risks and safety dangers.
It protects against shutdowns and network breaks.
A whole-house surge protection system safeguards all electrical devices in a home, whereas industrial surge protection ensures the safety of factories, offices, and other commercial equipment.
Electrical Risks in Home and Industry
You face different electrical dangers at home and at work. Homes may have bad wiring, old panels, or used appliances. These can cause short circuits, arc faults, and overheating. Factories deal with higher voltages and more complex systems. They must follow strict safety rules to keep workers safe and stop accidents.
Homes use circuit breakers, GFCIs, and AFCIs for safety. Factories need thermal relays, motor breakers, and surge protection devices. Both places must protect against power surges, but the risks and solutions are not the same.
Environment | Common Risks | Potential Consequences | Typical Protection Methods |
|---|---|---|---|
Home | Bad wiring, old panels, aging appliances | Short circuits, arc faults, overheating, power surges | Circuit breakers, GFCIs, AFCIs, whole-house surge protector |
Industry | High voltage, complex systems, large machinery | Equipment damage, downtime, worker safety hazards, power surges | Thermal relays, motor breakers, surge protection devices (SPD) |
Home electrical systems protect your family and household devices, while industrial systems safeguard workers and critical equipment. Choosing the right AC surge protection for your environment is essential to prevent damage and ensure safety.
Working Principles of AC Surge Protectors
Core Technology: AC Surge Protector Mechanism and Key Parameters
AC surge protectors help keep your electrical systems safe. They use special parts that work fast when a surge happens. These parts block extra voltage and protect your equipment.
Component | Function |
|---|---|
Metal Oxide Varistors (MOVs) | Acts like a valve. It lets normal current pass but sends extra voltage to the ground during a surge. |
Gas Discharge Tubes (GDTs) | Gives more protection. It uses gas to make a path for high voltage surges. |
Grounding Systems | Moves extra voltage safely into the ground. This helps the surge protector work well. |
Surge protectors react in just nanoseconds. They use clamping voltage to know when to send extra energy away. The joule rating tells how much energy the device can take. A higher rating means better protection for your devices.
Surge Classification and Waveform
Lightning Surges
Lightning can cause strong surges. These surges move through wires and can break equipment quickly. Surge protection blocks these sudden spikes.
Association with the 10/350 μs waveform.
Lightning surges often match the 10/350 μs waveform. This waveform rises fast and falls slowly. Surge protectors must handle this kind of energy to keep systems safe.
Switching Surges (Inductive/Operational)
Switching surges happen when big machines turn on or off. These surges come from changes in electrical flow inside buildings. They can hurt sensitive equipment.
Association with the 8/20 μs current wave.
Switching surges usually follow the 8/20 μs current wave. This waveform goes up and down quickly. Surge protectors must act fast to stop damage.
Protection Mechanism (MOV+GDT)
Briefly explain the working principles of Metal Oxide Varistors (MOV) and Gas Discharge Tubes (GDT), and the combined application of MOV + GDT technology.
Metal Oxide Varistors (MOVs) protect devices by soaking up extra voltage during surges. MOVs change resistance when voltage gets high. During a surge, they become low resistance and send extra energy to the ground. Gas Discharge Tubes (GDTs) use gas to make a path for high voltage surges. GDTs turn on during strong surges and help move energy away from equipment.
In AC surge protectors, MOVs respond almost instantly to small, short-duration surges, clamping the voltage to protect sensitive equipment. GDTs activate during larger or longer-lasting surges, safely diverting high-energy currents to ground. By combining MOVs and GDTs, surge protectors provide fast response for minor spikes while also handling severe surges, offering comprehensive protection.
Analysis of Key Specification Parameters
When you pick an AC surge protector, you should check some important numbers. These numbers show how well the device can keep your electrical system safe from surges. Each number tells you something about how the device works and how safe it is.
Maximum Continuous Operating Voltage (Uc)
Maximum continuous operating voltage (Uc) is the highest voltage the surge protector can handle without breaking. If your system often gets close to this number, you need a surge protector with a higher Uc. This helps your equipment stay safe during normal use and stops damage from small voltage changes.
Parameter | Definition | Testing Method |
|---|---|---|
Uc | Maximum continuous operating voltage; highest voltage the SPD can handle without degradation. | Tested to ensure continuous voltage withstand capability. |
Nominal Discharge Current (In)
Nominal discharge current (In) shows the rated current the surge protector can handle many times. Makers test this using an 8/20 µs waveform. If your building gets lots of surges, pick a device with a higher In. This means your surge protector will last longer and keep your system safe.
Parameter | Definition | Testing Method |
|---|---|---|
In | Nominal discharge current; rated current the SPD can manage in multiple surge events. | Tested using an 8/20 µs waveform to ensure durability over multiple surges. |
Maximum Discharge Current (Imax)
Maximum discharge current (Imax) tells you the largest surge current your device can safely send away. This is very important for places with strong surges, like factories or areas with lots of lightning. Makers test Imax with an 8/20 µs waveform. If you want strong protection, look for a surge protector with a high Imax.
Parameter | Definition | Testing Method |
|---|---|---|
Imax | Maximum discharge current; maximum surge current the SPD can safely divert. | Critical parameter for Class II SPDs, tested with an 8/20 µs waveform. |
Low Protection Level (Up): Emphasis on Achieving a Low Protection Level
Low protection level (Up) means the voltage between the surge protector’s terminals when a surge happens. You want this number to be low. A lower Up keeps your devices safer because less voltage gets to them during a surge. Always check this number before you buy a surge protector.
Here is a quick summary of the most important numbers:
Parameter | Description |
|---|---|
Maximum Continuous Operating Voltage (Uc) | The highest AC or DC voltage the surge protector can continuously withstand without degradation. |
Nominal Discharge Current (In) | The peak current (typically with an 8/20 µs waveform) the SPD can safely conduct repeatedly without damage. |
Maximum Discharge Current (Imax / Iimp) | The maximum surge current (often 8/20 µs waveform) the SPD can handle in a single event without failure. |
Voltage Protection Level (Up) | The residual voltage appearing across the SPD terminals during a surge; a lower Up indicates better protection. |
When you know these numbers, you can pick the right surge protector for your home or business. This helps keep your electrical equipment safe and working well.
Types, Protection Levels, and How to Choose an AC SPD
Overview of the Three- Layer SPD System
You need to know about the three-tier SPD system. This system uses three kinds of SPDs for full surge protection. It works for homes and factories.
SPD Type | Typical Location | Purpose |
|---|---|---|
Type 1 | Main Service Entrance / Incoming Power | Protects the entire building from high-energy surges, such as direct or nearby lightning strikes. |
Type 2 | Sub-Distribution Panels | Mitigates residual or medium-energy surges that pass through Type 1 SPDs. |
Type 3 | Near Sensitive Equipment / Point-of-Use | Protects individual devices from low-energy surges that can still damage electronics. |
Type 1 SPDs are installed at the main service entrance to safeguard the entire building from high-energy surges, including lightning. Type 2 SPDs are placed in sub-distribution panels to handle residual or medium-energy surges. Type 3 SPDs are installed close to sensitive equipment, providing point-of-use protection against low-energy surges that could still harm electronic devices.
Type 1 SPD: Main Service Entrance
Type 1 Surge Protectors keep your system safe from the strongest surges. You put them at the service entrance. They handle big surges, especially from lightning. This first layer protects your whole house or factory from outside dangers.
Type 2 SPD: Sub-Distribution Board
Type 2 Surge Protectors give the next level of protection. You install them in panels inside your building. They stop medium surges from switching or those that get past the main board. These are needed for homes and factories.
Type 3 SPD: Installed Close to End Devices, Protection Against Low-Level Surges
Type 3 Surge Protectors protect your most sensitive devices. You put them near the equipment, like in sockets or power strips. They guard against small surges that can still damage things like computers and TVs.
Focus on Type 2/3 SPD Applications
Type 2 and Type 3 SPDs work together to provide comprehensive surge protection. Type 2 SPDs are essential in every electrical installation and are typically installed in sub-distribution panels serving specific floors or areas. They protect against both external surges, such as lightning-induced transients, and internal surges caused by switching operations. In smaller buildings without dedicated lightning protection, Type 2 SPDs play a critical role in safeguarding electrical systems.
Type 3 SPDs are made for sensitive devices. You install them close to the equipment, like in the socket. They work best with Type 2 SPDs. Using both gives you full protection at every level.
SPD Type | Application Scenario | Installation Location |
|---|---|---|
Type 2 | Protects against surges from both internal and external sources; essential in all electrical setups, especially in smaller buildings without dedicated lightning protection. | Installed in sub-distribution boards serving specific floors, zones, or groups. |
Type 3 | Provides fine protection for sensitive devices; usually used in combination with Type 2 SPDs for layered protection. | Installed close to the equipment, such as at sockets or point-of-use panels. |
System Compatibility and AC SPD Selection
It is crucial to select SPDs that are compatible with your electrical system, as different systems have different protection requirements.”
For TN Systems:
TN-C systems: Use SPDs that protect between Neutral and Protective Earth (N-PE).
TN-S systems: Use SPDs specifically designed for N-PE protection, ensuring proper operation of the neutral and grounding connections.
For TT Systems:
SPDs must accommodate larger potential differences between the system neutral and the ground.
Type 2 SPDs are installed in distribution boards, while Type 3 SPDs are placed close to critical or sensitive equipment.
Connect SPDs from phase to neutral and neutral to ground to ensure overcurrent protection devices function correctly.
GDT-based SPDs are recommended because they can safely handle high-energy surges typical in TT networks.
Product Form and Advantages
You can pick from different SPD designs. Pluggable, plug-in, and modular types make fixing easy. You can change parts fast without turning off everything. This saves time and keeps your system working.
Small designs are good for factories. They fit in tight spaces and let you add more protection. These features help keep your home or business safe from surges. They also make setup and fixing simple.
Tip: Always check if your SPD matches your system.
Selecting the Right AC Surge Protector for Your Needs
Key Features
When you pick an AC surge protector, look for features that keep your devices safe. Surge capacity shows how much energy the device can handle. You want a surge capacity between 50 kW and 100 kA. Response time tells how fast the protector works. A lower response time is better, less than 1 nanosecond is best. Clamping voltage should be 400V or less for good protection. Operation indicators are lights that show if the unit works. DIN rail compatibility makes it easy to put on control panels.
Feature | Description |
|---|---|
Surge Capacity | Indicates how much energy the SPD can safely handle; typical effective range is 50 kA to 100 kA. Higher capacity provides better protection for homes and industrial systems. |
Response Time | The speed at which the SPD reacts to a surge. Lower is better; less than 1 nanosecond is ideal to prevent surges from reaching connected devices. |
Clamping Voltage (Up) | The voltage at which the SPD starts conducting; 400 V or lower is recommended for effective device protection. |
Operation Indicator | LED or window indicators that show whether the unit is functioning properly. |
DIN Rail Compatibility | Ensures easy installation in control or distribution panels, especially in industrial settings. |
A fast response time ensures surges are blocked before reaching your devices, while higher surge capacity provides robust protection for both homes and factories. Operation indicators allow quick verification of SPD status, and DIN rail compatibility simplifies installation in industrial control panels. Selecting an SPD with the right combination of these features ensures reliable and long-lasting protection for your electrical system.
Home Applications: Safeguarding Sensitive Electronics
In residential settings, the primary goal of surge protection is to safeguard sensitive, microprocessor-based devices—such as smart TVs, computers, home automation hubs, and modern kitchen appliances—from internal and external voltage transients.
Although homes typically experience lower overall fault currents than industrial facilities, delicate electronics remain highly vulnerable. Therefore, achieving a low voltage protection level (Up) at the final distribution point is critical.
Recommended Residential Surge Protection Strategy:
Whole-House Protection
Install a Type 2 SPD or Type 2+3 SPD at the main residential distribution board.
Provides the first line of defense against external surges (e.g., indirect lightning) and internal switching surges.
Typically DIN-rail mounted for easy installation and maintenance.
System Suitability
Ensure the SPD is compatible with common domestic power systems, such as TT or TN-S configurations.
Circuit Interruption
Associated circuit breakers or backup fuses should have a short-circuit breaking current below 6 kA, appropriate for residential fault levels while ensuring the SPD can safely isolate itself during a failure.
Point-of-Use Protection
Use Type 3 SPDs near sensitive equipment (e.g., servers, high-end entertainment systems) or integrated into power strips.
Clamps residual transients that pass through the main protection layer.
Case Study: Residential Protection
Even a seemingly mild thunderstorm can cause irreparable damage to household electronics. However, with a properly installed Type 2+3 Surge Protector at the main panel, excess lightning-induced current (8/20 µs waveform) is safely diverted to ground, protecting all downstream appliances. In this scenario, what could have been a major disaster becomes only a minor maintenance issue.
Industrial Applications: Robust Protection for Critical Machinery
Industrial facilities—such as factories, data centers, and heavy processing plants—face a more demanding electrical environment due to:
High-energy inductive loads (large motors, transformers) generating frequent, powerful internal switching surges.
Operational continuity requirements, where critical processes must remain uninterrupted.
Industrial surge protection systems typically adopt a cascaded, multi-stage approach using robust components:
Higher Current Tolerance
Backup fuses and protective devices must handle significantly higher short-circuit currents, often 15 kA to 20 kA, to safely manage industrial energy levels.
Multi-Stage Cascading
Protection begins with Type 1 SPDs at the service entrance (for direct lightning exposure) and continues with Type 2 SPDs at sub-panels or control cabinet entrances.
Devices must feature high Nominal Discharge Current (In) and Maximum Discharge Current (Imax) ratings.
Complex System Adaptation
SPDs must be selected for compatibility with three-phase configurations, including TN-C-S (PME) systems, where grounding arrangements are critical for effective protection.
Operational Reliability
Pluggable/modular designs allow replacement of SPD modules without shutting down the main power, maximizing system uptime.
Remote Monitoring
Remote signaling/contact outputs and clear status/LED indicators integrate with plant control systems for immediate fault notification and predictive maintenance—essential for continuous operation.
Case Study: Industrial Resilience
In a food processing plant, industrial-grade SPDs were installed in the distribution cabinet. During a grid switching event generating high-voltage pulses, the SPDs effectively clipped the transient, ensuring uninterrupted operation of complex processing and control systems. This demonstrates how robust surge protection safeguards both production continuity and personnel safety.
Installation, Deployment, and Compliance Tips of AC Surge Protector
Installation Basics: The process for DIN rail / DIN-rail mounted installation
You can put in surge protection if you follow easy steps. DIN rail mounting is used in homes and factories. This way keeps your surge protector safe and makes fixing it easy. Here is a simple guide:
Choose the Installation Location
Put the surge protector at the main board or near important devices.Turn Off Power
Always turn off the power before you start. This keeps you safe from getting shocked.Mount the SPD
Clip the surge protector onto the DIN rail or panel. Make sure it does not move.Prepare the Cables
Take off the plastic from the ends of the wires. This helps you connect them well.Connect the Wires
Use the wiring picture to join the live (L), neutral (N), and earth (PE) wires.Double-Check Connections
Look at each wire. Make sure they are tight and in the right spot.Restore Power and Test
Turn the power back on. Check if the surge protector works.Regular Maintenance
Look at the surge protector often. See if it looks worn or broken.
If you have questions about putting it in, you can ask LSP manufacturer.
Backup Protection: Necessity and Selection Criteria
Backup protection is essential to safeguard your electrical system if the surge protector fails or becomes damaged. Unlike the SPD, which responds to transient surges, the backup fuse or circuit breaker is designed to act quickly during a short-circuit condition without reacting to normal surge events. Proper selection ensures system safety while avoiding unnecessary interruptions.
Key Selection Criteria:
Non-Response to Surges
The backup protection device should ignore transient surges, preventing unnecessary shutdowns caused by normal SPD operation.
Fast Operation During Short Circuits
It must disconnect quickly if a short circuit occurs in the SPD or the protected circuit, minimizing damage and maintaining system safety.
Ability to Withstand Surge Currents
The fuse or breaker should withstand transient surge currents without tripping unnecessarily, ensuring compatibility with the SPD’s energy handling.
Summary:
Backup protection acts as a last line of defense, isolating faults while allowing the SPD to perform normal surge suppression. Selecting the right device ensures both effective surge protection and reliable system operation.
Avoiding Installation Errors and Correct Wiring Methods
Proper installation is critical to ensure AC surge protectors provide effective protection. Common mistakes can reduce performance or even create hazards. Key guidelines include:
Correct Voltage Rating
Select a surge protector with a maximum continuous operating voltage (Uc) slightly above your system voltage, typically system voltage + 10%, to prevent unwanted shutdowns.
Minimize Lead Lengths
Keep wiring between the SPD and the panel as short as possible, ideally under 1 meter, to maintain a low clamping voltage and effective surge suppression.
Proper Grounding
Connect the SPD’s ground terminal to the main earthing point using a dedicated 6 mm copper conductor.
Ensure the total grounding resistance is below 0.1 Ω for optimal performance.
Routine Status Checks
Inspect LED or window indicators every three months to verify the SPD is operational and detect potential faults early.
Installation Proximity:
Always install SPDs as close as possible to the sensitive devices they protect. This minimizes voltage spikes reaching the equipment and maximizes protection.
Compliance Requirements: IEC/EN 61643-11
When selecting an AC surge protector, ensure it complies with IEC/EN 61643-11, the international standard for low-voltage surge protective devices (SPDs). Compliance indicates that the SPD has been rigorously tested for safety, reliability, and performance.
Key Points of IEC/EN 61643-11:
Performance – The SPD must react quickly to transient surges and clamp voltage effectively to protect connected devices.
Classification – Defines the SPD type (Type 1, Type 2, Type 3) and its intended application.
Coordination – Ensures compatibility with other protective devices within the electrical system.
Installation – Specifies safe and proper installation practices for residential, commercial, and industrial environments.
Testing – Sets strict limits for surge current handling, thermal endurance, and long-term operational reliability under extreme conditions.
Practical Advice:
Look for SPDs with proven IEC/EN 61643-11 standard and ask manufacturers for test reports.
Compliance ensures that the device can handle high-energy surges and maintain protection over time, minimizing equipment damage and downtime.
Certification is not just a label—verify real-world performance and reliability before selection.
Tip: Selecting an SPD with IEC/EN 61643-11 compliance provides confidence in device protection and reduces the risk of costly repairs.
Monitoring and Maintaining AC Surge Protectors
Routine Maintenance: How to check the Status indicator / Window indicator.
You should check your AC surge protector often. Surge protectors have flags that show if they work. These signals help you find problems early.
Check the status flag on your surge protector.
If you see a clear flag, your device works fine.
If you see a a red flag, there may be a problem.
Change the surge protector right away if you see these warning signs.
Make these checks part of your regular maintenance.
Looking at the status indicator helps you find problems before they hurt your devices. Doing these checks keeps your home or business safe.
Tip: Set a reminder to look at your surge protector every month. This easy habit helps you stop damage before it happens.
Replacement Signs: When to replace Pluggable modules
Pluggable modules in surge protectors should be replaced when they show signs of malfunction. Key warning indicators include:
Window Indicator Issues
If the status LED shows an overload, fault, or remains off, the module may need replacement.
Frequent Equipment Tripping
If connected devices frequently trip or behave abnormally, it may indicate the SPD is no longer functioning correctly.
Unstable Operation
Irregular performance of connected electronics can signal that the surge protector module is failing.
Overheating
If the SPD feels unusually hot, it may require replacement to avoid safety hazards.
Repeated Failures
Modules that fail multiple times should be replaced promptly.
End of Service Life
Surge protectors have a finite lifespan. If the module is old or has been in service for many years, replacement is recommended.
Recommendation:
Replace pluggable modules immediately if any of these signs appear. Timely replacement ensures continued protection for your electrical system.
Always consult the SPD manufacturer if unsure about module condition or replacement procedures.
Advanced Features and Smart Integration of AC SPDs
Remote signaling / Remote contact: How to use remote contacts for fault alarms and status monitoring.
Modern AC surge protectors have remote signaling. You can use remote contacts to watch your surge protector from far away. These contacts link to alarms or building systems. If the surge protector finds a problem or gets old, the remote contact sends a signal. You get an alert right away. This helps you fix things fast and stop damage.
You can connect the remote contact to a control panel or alarm light. If the surge protector stops working, the system tells you. This is useful in big buildings or factories. You do not have to check every device by hand. If you want help with remote signaling, you can ask LSP manufacturer.
Tip: Remote signaling helps you keep your electrical system safe. You do not need to check each surge protector one by one.
Key Benefits of AC Surge Protectors
Equipment Protection
Prevents excessive voltage from damaging electronics and electrical systems.
Safety
Reduces the risk of fires and other hazards caused by surges.
System Reliability
Keeps HVAC, network, and industrial systems running smoothly during electrical disturbances.
Cost Savings
Extends the lifespan of devices and minimizes repair or replacement expenses.
Practical Recommendations
Select the right SPD based on system type, location, and device sensitivity.
Professional installation ensures proper protection and compliance with standards.
Regular maintenance and monitoring, such as checking status indicators, helps identify issues early and maintain ongoing protection.
FAQ
What does an AC surge protector do?
An AC surge protector keeps your devices safe from sudden voltage spikes. It blocks extra electricity and sends it away from your equipment. You protect your home or business from damage.
How often should you check your surge protector?
You should check your surge protector every month. Look at the window indicator. If you see a warning sign, replace the device.
Can you install a surge protector by yourself?
You can install some surge protectors if you follow the instructions. Always turn off the power first.
Where should you place an AC surge protector?
You should place the surge protector near your main electrical panel or close to sensitive devices. Short wires work best.
How do you know when to replace a surge protector?
Check the window indicator. If it shows red or does not light up, replace the surge protector. Old devices may also need changing. For more details, feel free to ask LSP manufacturer.
Do surge protectors work for lightning strikes?
Surge protectors help block voltage from lightning strikes. They lower the risk of damage to your devices. For strong protection, use the right type.
What certifications should you look for?
You should look for certifications like TUV, CE, CB. These show the surge protector meets safety standards.
Can surge protectors protect all devices in your home?
Whole house surge protection system help protect all devices. You may need extra protection for sensitive equipment.
