I have worked for Intel, Cisco & Wipro in electronic design for ten (10) years and many products in which I was a partner of design are now used industries and homes globally.  All of them were exported after qualifying the high voltage safety tests in labs. Here goes the FB profile of the writer.

Moreover, the writer has never used any stabilizer at his residence in Bengaluru and his parents’ residence in Kerala (686 636). Appliances like inverter, fridge, microwave oven, computer, laptop charger, printer, many routers (including multi-WAN), Google Home, mobile chargers, LED bulbs, tube lights, expensive BLDC fans, normal fans, smart switches, smart bulbs, air purifiers and CCTV and lab equipment including oscilloscope (the lowest model of Tektronix, costing  Rs.40,000/-). None of them were ever damaged due to power issues. However, I use the protection of www.electroexpert.co.in. Most of the devices will always be on as I am accessing internet facility. The writer uses two internet connections simultaneously to ensure internet availability . However, there were times when the washing machine, microwave oven and hard disk were damaged due to damaged mechanical parts. This makes the writer confident to import many equipments nonetheless their warranty.

The writer think it’s good if electronics function sans any damage for the first five years and this is the reason why writer says that they are good 8 years after.

From these experiences, let us explore 5 solutions existing for electrical problems & help you to choose what you need:

  1.   Stabilizers(1000-3000)
  2.   Spike arrestor(500-2500)
  3.   High low cut & UPS(~Rs.25,000)
  4.   Whole house Surge arrester(~Rs 5,000-2,00,000)
  5.   Transformer(~10Lakhs)



Stabilizers are miniatures of transformer combined with some spike arresters. There was a time when low voltage was a regular affair in our country. During evenings, the power used to sink to 100V and the bulbs had just their filaments visible. Old CRT TVs and fridges are electrical appliances that need exactly 220V  the low voltage caused them either to not to work at all or burn. Remember that people then praised tube lights over normal bulbs, which would continue to give light once started. Years passed on, the electricity boards installed more transformers to solve the voltage issue.Nowadays, It happens once in a while when Drop Out fuse breaks in hte transformer only. Moreover, since most equipments are now electronic, they would work in 100V, too. However, they are more prone to perish in high voltages like a lightning. Fan, motor and mixer grinder are still electrical and they want 220V, which a stabilizer can help. But since their repair cost is less than the price of a stabilizer, nobody goes for it. Instead, we spend for stabilizer for costly appliances. We believe stabilizer companies than television companies. We refuse to believe manufacturers who have qualified international quality tests. Many manufacturers advertise that their products don’t need stabilizers and try to please customers with an added warranty of one year. In fact, the warranty covers manufacturing defects and not damages caused by use or acts of god. Low cost damages are often repaired by companies without a dispute. However, professional equipments won’t be replaced for power line damages. Do you think the companies who can make LCD TVs and inverter ACs don’t know to make stabilizers?

Still sellers say it is good to have them, why?

The resellers always suggest the best of their knowledge. It is always better to connect through stabilizers, than directly. You may have noticed some of your fans go in every over voltage/ lightning damage, but some never goes.. Did you think why?

The high frequency electricity chooses the path according to the impedance of the path.In low frequency, the current passes equally to all direction, if connection is same. So the path of the 10khz current will not be same as low frequency 50Hz current. The high voltages are normally higher than 10khz. Stabilizers are making such impedanceor resistance, in the path which make the high voltages to prefer(divert) low cost devices like fans and lights  and gives a better protection to the costly equipments which has stabilizer. The writer has handled 10GHz signals in Intel motherboards to know the details of these effects of electricity.

I posted this as the following ad was misguiding:

Figure 1: Stabilizer Advertisement

We can see that even microwave oven and washing machine have stabilizers!Please search in Amazon.in

But these are not exported. As you know everybody tries to export to make more money. Google says that even to Africa,it is not exported;(Google “stabilizer” export)

The electricity board staffers are like any ordinary government official, with no foreign exposure. The state government system doesn’t entertain lateral entry. And also they are busy in arranging power to our houses and maintaining power lines.In my opinion, the electricity board staffers need exposure to the overseas power distribution networks also. Then only the world class power infrastructure will come in India also.

Picture of the waveform of the ideal current is as follow. The picture is created by Excel entering real values. One can be taken as normal 240V, 360V high voltage is 1.5 and low voltage 120V is 0.5.

Figure 2: Ideal sine wave ac voltage without any spikes

Here is what the stabilizers advertise:

(They advertise what they can solve with ease!) This kind of waveforms are 100%  predicted when large inductive loads gets on or off like the transformers by your electricity board or your neighbour turns on and off his large 3 phase motor.

But the BIS marked equipements will not damage upto 4000v. Because BIS is validating the international IEC 60950-1 . Even though IEC 60950-1 is a user safety standard, instead of working voltages,it makes the manufacturers test for IEC standards. You can see almost all equipements you use and relevant BIS standard at this link.

Figure 3: BIS mark in Electronic Equipment, which is mandatory from 2012

The equipments which are bought from abroad, need to be checked for CE/UL listed/TUV/IEC.  If one of these mark present, they are mostly withstanding 4000V. The writer of this article has worked in the labs for qualifying these international standards. In short, these kind of voltages(<4000V) doesn’t need a protection


However, the stabilizers, too, give protection that may wear and tear like spike arrestor. Now, see the real picture. The normal voltage is too small to be seen & unwanted is very large compared to normal voltage..

Figure 4: Advertised spikes which actually within 4000V

There are scenarios where these stabilizers are “mum”.  This is what happens when lightning occurs anywhere in your power distribution network but no direct impact in your place(like tree burning, wall cracking are direct impact). If you are near to a tall structure with lightning protection, and you both share same transformer, your electrical equipments are at high risk.

Figure 5: Actual surges in power line which is around 40,000V.

Stabilizers will tell you what happens to your devices with long-term bad voltage. But they are silent about more problematic short-term voltage issues because they have no solution at all.

Figure 6: Basic stabilizer circuit. Whatever the improvement, electronics inside stabilizer cannot be reliable above 4,000V

Stabilizer circuit (Details can be read from reference 4)


  1.   If P&N have similar spike/ over voltage, the normal voltage variations are not exchanged between them as an additional transformer separates the load and the line. This saves 2-pin devices (even TV is 2-pin), however, 3-pin devices with good earthing would suffer, because the earthing here acts like a conductor that passes electricity. The RCCB will trip if there is a leakage through your devices to the earth. RCCBs are meant to save human lives, not devices.
  2.   If it is differential spike (that is, between P&N), a short circuit happens and the stabilizer coil burns out after a high impact, like your fans die in the lightning. Small 2 pin devices like mobile charger  will burst off otherwise. That is why we hear a lot of mobile charger explosions. Those are actually rated for safety at 4kv spikes. RCCBs wont trip if a fan dies as there is no ground path created.
  3.   Stabilizers Cost only 10% of the protected device
  4.   It diverts the spikes to unprotected devices like fans and LED bulbs etc as the the transformer inside the stabilizer provides a harder path to conduct for the spike voltage.


  1.   2W current is required to keep stabilizers working.
  2.   Stabilizers are not required for  electronic (110-240V) equipments, but required for 220/240V equipments (which are fan, mixer grinder motor pump now).
  3.   Cannot protect whole house. It is only diverting energy from costly to cheap devices.
  4.   Stabilizer never kills the spikes. If it kills, the stabilizer coil is burned & will stop working. There will be MOVs in stabilizers also, just like  all electronic equipments to give a survival for the warranty period or like the spike arrester. I will tell about MOVs later.
  5.   Like All normal electronic devices, components inside the stabilizer is rated 4-6kv. Indoor voltage is assumed to be 4kv. After 4kv, the air gets conductive if space between 1mm and is called arcing. The spike I showed is 40kv which will conduct even at 10mm apart by arcing. So it will even arc even inside the PCB and burn it.
  6.   If leak happens to earth through your devices, RCCB false triggering would happen, mistaking it as a human shock. As said above, RCCBs should stop only when there is a human shock. In short circuits, MCBs should be off, not RCCBs.
  7.   No guarantee on protection like insurance on protected devices. Protection without guarantee is like you put money to churches with only belief. IRDA approved Insurance cost normally 1% for 1 year. Even 10 year use, u will pay only 10% of the cost. But remember, insurance is always for unexpected incidents, not for foreseeable ones. If the claim is high, insurance companies won’t give you policies.
  8.   Developed countries not using stabilizer. They have better solutions available. Ask NRIs whether they use it.
  9.   Even the malls or MNC  IT offices in India don’t use stabilizer. They have imported equipments worth millions to protect.
  10.  Look at mobile towers with lightning arresters. They keep working day and night. No stabilizers used. They have level 1 surge protection which is required only where lightning arresters installed.
  11.  No option to replace sacrificed devices inside and reuse by user. Only company can open and repair.

This movie scene in VALAIKKARAN(TAMIL) is actually correct, but still we don’t believe.


But the spikes coming through lightning & large inductive loads like motors on-off, some substation load trip like transformer disconnects or when a fan switch off in a lower scale. I know a substation load trip caused all computer damage in electricity board section office near ElectroExpert office, which is ideal wiring as per KSEB.  Electroexpert customer who is a cable operator was remained unaffected, just 1.4km away.

Now there are so many spike arrestors available to fix the spike problem. But spike arrestors are sacrificing devices. Their rating is at kA of current and it acts normally at 470V and after 5-10 strikes it dies out. Those have MOVs which I mentioned earlier. It is a must for all electronic equipments.

But all spike arrestors don’t have real spike arresting. The fakes have capacitors and real ones have MOVs. The real ones give some insurance also . READ reference 1 for more details.

Here goes the picture of some fake and real spike protections.

Fake (noise filter)

This is an eyewash like stabilizers and offers no protection.

Figure 7: Labeled as noise filter and selling as spike arrester

Real (inside)

Figure 8: A branded spike arrester with warranty for protected devices

Now are you safe if you use only a spike arrester?

  1.   Provided your spike arrester has a indication that its life is ended & then you replace it.
  2.   There is a chance that last spike causing the sacrifice of the MOV, can cause a damage to your device also. So make sure that you have 2 levels of surge arresters in path to make sure you are safe. For example, use a surge arrester before the inverter & then just before the costly electronics
  3.   However, in my experience, the real spike arresters would become inactive within one month. I had used spike arrestors before I switched to Electroexpert.
  4.   If you don’t want to replace spike arrestors frequently, use a surge arrester protection besides spike arrestors.

Read more details from reference 3



Figure 9: Adjustable Voltage High-low cut off available for whole house instead of protecting each device separately

When you use stabilizers for expensive devices & LEDs, you will never come to know that they are running in low voltage. They won’t show a light variation as a filament bulb does. So you can use  a high low cut to keep voltage in control for entire house & UPS to operate devices to keep things when low voltage.

Remember if you need your water pump running at any time irrespective of voltage, you have to add a stabilizer to it, which is impractical. But if you can wait till voltage is OK, you can use a high low cut for entire house. My suggestion is install a high low cut first, if no output comes from high low cut for majority of time, in  a month, then go for stabilizers.

See the working of High low cut in  an ElectroExpert Installation. Actually stabilizers came to existence to handle these kind of situation. Here high low cut works automatically to connect and disconnect power lines for the entire house according to voltage. If we used stabilizer, we should have used stabilizer for each device.



  1.   1.No fluctuations & on off to protected devices and the motor doesn’t burn
  2.   No down time as UPS will power even if power is bad
  3.   Any device can work despite voltage fluctuations. If voltage is low, the cut-off will disconnect/ connect itself.
  4.   Perfect for running electrical devices(220-240V), but not enough for electronic devices(110-240V)


  1.   Spikes can kill both high low cut off, UPS & everything
  2.   Not saving costly electronics, but saving cheaper electrical.

Normal spike arresters would block only up to 6kA current, however, the surge through line can be up to 40kA. Many whole house surge arresters like Schneider come in 40kA rating. Read reference 1 for details.

Whole house surge protection

In fact, this is an upgraded spike arrester. Basically There are 2 different kinds(actually 4 kinds, according to the IEC) of surge protection. The idea of sacrifice for protection is not understood correctly yet, like airbag in car or helmet these devices dies out after 10-15 operations typically in an year. But we don’t know when. It will indicate the end of life by indicator and we need to change it. It is the same principle of spike arrester, but in a higher capacity. Even the stabilisers use this trick to protect from spikes, but at small level and cannot be replaced.

Figure 10: Surge arresters from Schneider(Image reference: Schneider)


  1.   Most cost effective & best technology for complete protection.
  2.   Used by entire world & industries in India.
  3.   Unwanted RCCB trips are avoided and no need to call electrician for fixing RCCB trip. The RCCB false triggering will happen, if the leak happens to earth through your devices. RCCBs are only for human life protection, and not supposed to trip during spikes.
  4.   Whole house is protected, including lights and fans
  5.   ElectroExpert provide, No damage guaranteed with insurance backup for the protected devices, not for the protection devices like stabilizers and spike arresters
  6.   Modular fitting & can be replaced by user


  1.   Wiring change required
  2.   Good earthing required
  3.   Yearly replacement of sacrificed modules.



A dedicated transformer is good for your house/hospital/building


Figure 11: A typical transformer installation, showing DO fuse & AB switch.Reference https://www.facebook.com/electricsafetykerala/



  1.   It converts the voltages of 11KV to 240V(about 1/40) and keep all voltages correct
  2.   Minimum outage as only if the 11KV break.
  3.   Even the high voltage spikes from outside are reduced by 1/40. As i told earlier, the small form factor stabilizers cannot do it, the high voltages will jump 1cm or more by 40kv. Those also can be arrested by transformer.


  1.   High cost
  2.   Spikes generated locally within the transformers power distribution area(LV area ) can cause local damage. Like a motor on/off arcing or a transformer on off arcing or even a lightning in the building where the transformer is used.



The devices with BIS mark won’t damage till 4000V. Because BIS inspects whether the international standard, IEC 60950-1 is followed.Devices bought from abroad canb e checked for IEC/TUV marks. If you check details of these marks, it will indicate, they will support 4000V. In short you dont need protection for these devices.

ElectroExpert protection uses 2,3 &4  protection methods which are tested in field for high quality and  cheapest solution available.It excels the normal surge protection by 2 times more protection, while the cost of maintanence per year is less than the labour cost of an electrician for a single day, while it avoid the need to call electrician for RCCB trips.On top of all these it has a backup of IRDA approved insurance, in case of any failures.

By supporting www.electroexpert.co.in, I want to correct persisting mistakes and to inform people more. I don’t want to regret in 50s that I didn’t do anything as a youthful and knowledgeable engineer in his 30s. India is still in its digital infancy. We need to travel long to compete to the global technology. Otherwise, the digital India bus would never start!

REFERENCE1: https://www.cnet.com/news/9-things-you-should-know-about-surge-protectors/

REFERENCE2; https://www.firstpost.com/business/brands-business/dont-skimp-on-stabilizers-and-inverters-say-v-guards-new-ads-1969419.html

REFERENCE 3:https://www.schneider-electric.com/en/product-range/61706-acti-9-iprf1%2C–prd1/166377288-modular-surge-arrester/

REFERENCE 4: https://www.electricaltechnology.org/2016/11/what-is-voltage-stabilizer-how-it-works.html