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Why Is The Surge Protector Making Noise [3 Reasons]

It is not always normal for a surge protector to make loud noises. As it is for all electronic components. 

However, the clicking sound is normal. But when the sound becomes too loud and noisy, it’s a problem. 

Why is the surge protector making noise?

The loud and noisy sound coming from the surge protector is an indication of faults. During sudden surges, surge protectors make clicking, popping and buzzing sounds. Popping may be the sign of a capacitor or MOV exploding. If you smell burning plastic then it’s time you replace your surge protector. 

Besides the sudden surge, surge protectors also make certain noises due to various reasons. They may also generate sound just because a surge protector has poor quality components.  

Let us go check the kinds of noise that surge protectors make and why they make it. 

Surge Protectors Make Different Kinds of Noise!

Due to different underlying reasons surge protectors may make different kinds of noise. They may produce beeping, humming, and crackling sounds. 

Let us see the reason behind the 3 common kinds of sounds that surge protectors make. 

Surge Protector Beeping Noise

You won’t hear normal surge protectors making beeping sounds. If it does it means that it has a diagnostic function. Which is making it beep during a surge spike. 

Sudden voltage spikes occur due to high power requirement appliances. That’s why you  need a surge protector for the washing machine

Also, the surge protector has UPS, which might be beeping to alarm. That certain appliance might be sucking too much backup power from the surge protector.  

If the beeping noise is because of UPS. Simply shut the connected devices. Remember that this backup power is not supposed to keep your high voltage device running. 

Surge Protector Humming Noise

Humming sound is also a normal thing in electric components. But hearing it from far away is not a good sign. 

The first reason for humming sounds is loose internal wires. So, that’s the first thing to check in case of humming noise coming from the surge protector. 

Additionally, don’t forget to check for poorly grounded wall outlets as well. 

Surge Protector Crackling Noise

Crackling noise coming from surge protectors most likely indicates frayed or damaged wiring. The crackling sound simply means that components inside the surge protector are deteriorating. 

The same thing could happen with the wall outlet components so don’t forget that.  

Additionally, you also might smell burning along with the crackling. This would mean that the wiring circuit or other component is burning inside the surge protector.  

3 Reasons Why Surge Protector Making Noise

Sound of electricity is noise. But the reasons for noise in your TV and surge protector would be different. 

For instance, high voltage power lines may be making buzzing sounds. This is because electrical discharge is passing near the power lines through the air. So sounds are normal for electricity. 

But all the sounds or noise you hear are not necessarily coming from the surge protector. It could also be because the appliance is plugged in. The higher the voltage requirement of the appliance, the louder the sound will be. 

Improper use of surge protectors is the big cause of noise as well. An example of improper use of surge protectors is plugging a power strip into a surge protector.

I will tell you about the different kinds of sounds that your surge may make. And why do they make such a sound? So let’s go.  

Reason 1: Surge Protector Noise In Case of a Surge

As the name of surge protectors indicates that they are made to protect from sudden surges. They do protection by absorbing and redirecting excess current. 

Surge protectors are designed to make clicking when they encounter a surge. So, click is an indication that your surge is doing what it was meant for. Which is to protect your power strip and appliances from the sudden surge. 

So, clicking sound coming from a surge protector is a good thing. But a problem when it’s continuously clicking. Continuous clicking is a sign of continuous spikes in voltage. This occurs due to high demand by certain plugged appliances. 

To avoid sudden spikes of voltage simply look out for compatible appliances. Avoid plugging in too many power-hungry appliances at the same time. 

Also due to poor quality components surge protectors may go bad. Check out some of the best quality surge protectors:

Product 1
Product 2

Using high-quality surge protectors would keep you relieved in the long run. 

Reason 2: Noise Coming from Appliance 

It is not wise to hurry up blaming surge protectors right away when you hear sound. Sound could be of something else. Carefully check what appliances are plugged into your surge protector. 

The quickest and most easy solution is to simply remove any appliance plugged in. If the sound stopping would indicate that the surge protector is fine. Also, try to use your surge protector somewhere else to see if it stops. 

If it doesn’t stop, then first check for any other electric device in the nearby area. Then check for any frayed wires in the wall that would most likely make a buzzing noise.   

Reason 3: Spark and Failure

You might hear popping or sizzling sounds inside the surge protector. That’s probably because something inside the surge protector has exploded. It could either be a capacitor or a MOV. 

This metal oxide varistor (MOV) will protect the circuit from high voltage spikes. And this component makes your power strip a surge protector. So, popping would surely be a failure if it’s because of the MOV explosion. 

Sparking sound or visible spark is directly related to power-hungry appliances. So, you might hear it right when you are plugging such an appliance into the surge protector. It is because they demand sudden high voltage. 

Furthermore, surge protectors used for a long time may face loose wire and component deterioration. And their noise will become more continuous and loud.


Question: Can a surge protector explode?

Answer: Most probably yes, they can. But exploding surge protectors means exploding parts inside it. Like it could be a capacitor, fuse, breaker, or MOV component. You might see the blackish color of the socket opening. This occurs when surge protectors face high voltage spikes due to power-hungry appliances.

Question: Can a surge protector start a fire?

Answer: Yes, surge protectors are known for sometimes catching fire. Improper use of surge protectors is the main cause of fire hazards. Such as plugging in one surge protector into another one and making daisy-chaining. This is a strongly discouraged practice and poses a serious risk. 

Question: What causes the surge protector prong to melt?

Answer: Most common cause due to which the surge protector’s prong may melt is loose wiring. It could also happen because of the oxidation of that specific prong. The voltage drop across the connection would generate heat. Eventually melting the prong or plug. 


The answer to why the surge protector is making noise would be pretty clear by now. 

Additionally, you became known with different kinds of noise coming from surge protectors. And what a certain kind of sound might mean.

Stay safe, That’s all.