AC vs DC surge protection devices: Which is right for your application

 A voltage spike doesn’t warn you. It hits fast. Electrical equipment, including control panels, computers, solar inverters, and other sensitive devices, can be damaged in seconds. Some items keep running for a bit, then fail. Repair and replacement costs add up fast.


AC and DC systems both need protection. But they don’t need the same kind. Let us dive into the differences and how to choose the right one.



What is the difference between AC and DC?

AC stands for alternating current. The current direction flips back and forth repeatedly. Most homes, offices, factories, and commercial buildings run on AC. DC stands for direct current. It flows in one direction only. Solar panels and battery systems use DC.


Both AC and DC systems can experience voltage spikes caused by lightning or electrical switching. However, their protection needs differ. A surge protection device (SPD) must match the power supply type and voltage rating. Never use an AC model on a DC system unless the product specifications explicitly permit it.


The key difference is the supply type each device is designed to protect. An AC surge protection device is made for AC systems, while a DC SPD must be rated for the specific DC voltage and application, such as a solar PV installation.


How does a surge protection device function?

A surge protection device (SPD) helps protect equipment from sudden voltage spikes. It limits voltage and diverts surge current away from the equipment.


This reduces the chance of damage to wires, electrical panels and connected devices. An SPD does not protect against all types of problems, though. Before choosing a surge protection device SPD look at your power voltage, the type of system you have and the amount of surge protection you really need.


When should you use a type 2 SPD?

A surge protection device Type 2 is commonly installed in distribution boards to protect electrical installations from transient over voltages caused by switching events and induced lightning surges. Its suitability and placement depend on the installation design and any upstream surge protection.


Axis India offers Type 2 SPDs in its surge protection product range. The listed options cover single-phase and three-phase setups.


In commercial buildings and factories, the right Type 2 SPD depends on the distribution board configuration, the electrical system, and the upstream protection already installed.


Take a factory setup. It might have a Type 1 SPD at the incoming panel and a surge protection device Type 2 at a downstream distribution board. That puts protection at multiple points in the system.


How do you choose the right SPD?

Start with the power supply. AC or DC? Then check the voltage rating, number of phases, and the protection level you need.


For DC systems like solar setups, pick a device that’s specifically rated for that DC voltage and use case. Don’t assume an AC SPD runs safely on DC.


Then check the installation point. A surge protection device Type 2 is typically used at distribution level. Type 1 devices go in spots where the system needs stronger lightning surge protection.


Also check the SPD's maximum continuous operating voltage, discharge ratings and protection level against the system requirements. For solar PV installations, confirm that the device is specifically rated for the DC side of the system.


Axis India’s product range covers Type 1, Type 2, and combined Type 1+2 options. Check the product specifications to confirm the right model for your system.


Need help choosing the right surge protection?

The right surge protection device (SPD) helps protect electrical equipment from transient voltage spikes. Contact Axis India today to discuss your setup and review product specs before buying.


Explore Axis India’s surge protection devices and find the right option for your electrical system.


Frequently asked questions

1. Can an AC SPD be used in a DC system?

Only if the product specs clearly allow it. Always check the rated voltage and current type first.


2. Where is a Type 2 SPD installed?

Typically in a distribution board. Exact placement depends on the system design.


3. Does an SPD protect against every electrical fault?

No. It protects against voltage surges. Other faults need their own protective devices.


4. What should I check before buying an SPD?

Check the voltage, AC or DC supply, phase type, installation point, and required surge protection level.


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