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VMC machine PCB damaged inspite of having a stabilizer


We had a case where a VMC machine already having a stabilizer installed for it. However one of PCB was damaged in spite of having stabilizer. This is situation that happened after 4 years of installations. The stabilizer was from reputed make and was in good working condition. The VMC machine is from reputed international make.

Why did the VMC machine get damaged inspite of having stabilizer installed?

A servo stabilizer is voltage conditioner which stabilizes or brings the voltage to set point even if there any variations in voltage in the input. So if you want a stable supply then you will need a Stabilizer

However Stabilizer has 2 major limitations.

1. Response time: If the voltage shoots up to above 300V in any phase, the stabilizer will take atelast 6-7 seconds to cut off the supply to the equipment. In one second 50 cycles of high voltage supply pass in to the equipment and this can damage the equipment. So you need something that can cut off immediately when this happens.

2. Spikes: In a normal day , your equipment faces atleast 100-200 spikes , all of which pass through the stabilizer with out any resistance in to the equipment damaging it little by little. Equipment gets damaged over a period of 4-5 years. Spikes have duration in microseconds and stabilizer cannot react in such a short interval.

Our solution:

The solution we offered was in 2 steps.

1. Equipower- Main line Voltage protector with 20kA spike protection

We offered a 100A Equipower with single phasing preventor for complete premises so that it can handle problem of neutral opn or double phasing. In case of extreme over voltage it will cut off in fraction of seconds thereby saving the equipment from over voltage situation caused by external situations. It also has in built spike protection which prevents external spike from coming into the factory premises. Since there are other factory galas in the industrial estate, there is possiblity of spikes from other premises coming into the factory. So an Equipower at the main incomer helps in solving both of these issues.

2. Spike protection for individual machines

Each individual machine itself generates a spikes of its own and that is experience by other machines. There were several lathe machines and some CNC machines in the factory. Since the CNC machines were critical in nature we placed spike protection units at the individual CNC machines so that spikes from other machine do not enter in the CNC machine and damage the electronic PCBs over time.

3 Solutions for MOV damage problem in Solar inverter


Recently we visited a site where the solar inverter was damaged for third time. Both solar EPC as well as the client were distraught as all remedies had not worked and the solar inverter was damaged again. This is a common complaint by Solar EPC as well as the customers who have got solar power plant installed.

The response by Solar inverter companies was evasive and pointed out to things that are inconsequential and problem repeats after some days or months.

Many solar companies question the make of SPDs, ask for another make of SPD to be installed or ask to have another set of SPDs to be installed. They talk about grounding issues and connection problems. In one of those sites they recommended type 1+2 or class B+C surge protection, but that is something that should have been in place in the first place as the Type 1 responds to lightning impulses and type 2 is not meant for lightning protection. A normal ACDB does not have type 1 surge protection meant for lightning protection.

Root cause of problems -MOV damage

In all the occasions , MOVs ( Metal Oxide Varistors) are damaged. MOVs do not get damaged due to spikes , they merely stop conducting the spikes under normal conditions. MOVs burst is caused by over voltage and is not desirable as it damages the complete circuit and creates an internal short circuit. MOV damage will lead to downtime and brreakdown of machinery which in no way can be termed as voltage protection

If you look in picture above, the MOV rating is 420V and supply voltage is 415V. The voltage recordings for 48 hours revealed that phase voltage reached peak of 460V which is equivalent of 265V in single phase. This happened multiple times in 48 hours and also remained for considerable time – 15-20 mins each time.

SPDs and MOVs respond to spike only. They do not respond to continuous over voltage. If the continuous over voltage is beyond its threshold, like in the case above, the MOV will burst causing breakdown of solar plant.

Our solution for this problem

Our solution was offered as 3 options.

Option 1: Go for inverter with better specification

When we say better specification, we meant with internal MOVs rated for 500V and higher. This is however a bit difficult as the solar inverter companies would normally not disclose this information. Most Solar inverters are white labelled products manufactured in China. So it will also be difficult for them to change the specifications. Also one more problem is about neutral open or double phasing problem that happen on site. In all such situation even 500V MOV would get damaged.

Option 2: Complain to (DISCOM) authorities in documented form

In this option one has to file a written complaint to the DISCOMs and get an inward stamp. Anything that is documented needs to be closed. If not it is a big problem for concerned department. Verbal complaints over the phone are not entertained.

Did you know that as per Indian Electricity rules 1956 the supply voltage should not exceed 6% under normal and 12.5% under extreme situation? Did you know that you could use this as reference and make a big case if you had voltage recordings which proved that voltage exceeded 6%? The DISCOM would be deemed liable for the damages caused by this problem and would be held accountable.

The problem with this option is that it will involve courts and matter could takes months and years to resolve. But considering that you have some strong point here, one can and should take this option

Option 3: Go for voltage protection for solar inverter

This option is the most simplest and no brainer actually. Go for voltage protector with 10% cut off setting. In this case we have our product – Power kavach which can be offered with high voltage setting of 255V on higher side.

Only limitation to be taken in to account is that there will be a generation loss when the Power kavach shuts off the supply in case of over voltage.

There is always limit to courtesy extended by solar inverter or solar EPC. Free service and free replacements cannot be done indefinitely. It is always better to protect your equipment from such problems by using Power kavach

Have you faced similar problems ? Talk to us on 9769996205 or email on asm@microsystemservices.com

Equipower installed at Brigade Cosmopolis, White Field, Bangalore by one of our dealers


This is a home voltage protector installed Brigade Cosmopolis, White Field, for voltage protection of complete home. Installation done by our dealer from banglore, cyneric technolgies

See the list of dealers in your areas

Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for more than 24 hours. It is designed for this purpose specifically.

#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also  acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .

#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes.  However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.  

Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.

for queries, you contact us on 9769996205 or fill the form below

440V protection for solar inverter


What causes 440V in single phase?

440V in single phase is an accident and can happen due to following reasons:

  1. Neutral open or floating neutral
  2. Trees falling on over head wire causing double phasing
  3. Transformer blast/ transformer fault

Neutral open or floating neutral

In all premises we have star connected system, phase to phase voltage is 415V,  and Phase to neutral voltage is 230V

Figure above shows distribution system of typical facility with equally distributed load. Points A, B, C show possible places of neutral open

If neutral breaks at point A:

The voltage will continue to be normal till such time that the load are equal in all phases. Any imbalance in the load will cause changes in the voltage in phases. Technically all the phases are connected together and the currents cancel out so neutral is formed.

If neutral breaks at point B:

B phase will have 415 V. R & Y will still complete path through each other and effective voltage between then being 415V which will be equally dived across both loads. If the load changes the effective voltage across the loads can be calculate using the voltage divider rule

eg: voltage  across L3 can be calculated as (L3/(L2+L3))x 415V

If neutral breaks at point C:

R phase will have no continuity and Y&B phases will have voltage based on conditions discussed in above points
Trees falling on over head wires

Trees falling on over head wires or tree growing through them can cause phase to phase short circuit. Ideally there are breakers installed on lines for safety in such situation, but some times they do not operate due to rusting and non maintenance or some times lineman themselves bypass the breakers . this can cause 440V in secondary side of transformer or trigger Transformer blasts.

Transformer blast/ fault

These are generally  maintenance issues, and they can some time result in double phasing and 440V in single phase. In sept 2021, there was an incident in sangli where 400-500 homes experienced 440V in their homes and all equipments ON at that time like  TV, refrigerators, etc were damaged.

Other than this routine maintenance  or upgradation work involving underground cables can also trigger neutral open situation causing 440V even in city areas.

There will always be arguments on the probability of such accidents happening in cities being low, but if you look at even a district in general, there are atleast 10-15 incidents daily in different pockets of the region

Problem with solar inverters

Most solar inverters have over voltage protection, but in situation like neutral open , trees falling on over wires and transformer blasts, voltage can shoot up to 440V in any phase till the situation is corrected. In such situations all such solar inverters will get damaged in less than 2 mins.

We offer solutions for protection of solar inverters in such situations, which can withstand 440V for more than 24 hours.

You can get in touch with us over the Whatsapp on 9769996205 or write to us by filling up the form

3 Electrical problems no expert tells you. !


Any electrical scheme for premise( home/ office/ factory) generally includes current sensing products like MCB, ELCB, RCCB, RCBO, which do not react to voltage changes

If the voltage was to change from 230V to above 300V, the current protections will not react and as such there will be no protection available for over voltage. In such situation, one of weakest equipment in the line will get damaged, resulting in internal short circuit in components, which would then trigger the MCBs to trip and shut the supply preventing further damage. One equipment will be sacrificed to save other equipment and larger catastrophe.

While this happens there is possibility of sparking and any plastic covering, curtains, or wooden item can catch fire and whole premise is gutted down.

An incident like this has happened in Mumbai, some years back when a TV on standby mode got damaged and curtains beside the TV caught fire and whole apartment was up in flames. As there was no one at the house, tragedy could not be averted. This is true for many working professional with working spouses. Also with home automation systems adopted in homes, most of equipment will always be on standby.

One more striking information about the incident was that in the same building 8-10 other flats had issue of TV, refrigerator damage at the same time. This is classic case of neutral open or floating neutral which caused 440V in one of the phases and everything ON was damaged.

Just like short circuit 440V can also happen in any electrical circuit, however unlike short-circuit, there are no safeguards for 440V in any homes office or factories.

What causes 440V in single phase?

440V in single phase is an accident and can happen due to following reasons:

  1. Neutral open or floating neutral
  2. Trees falling on over head wire causing double phasing
  3. Transformer blast/ transformer fault

Neutral open or floating neutral

In all premises we have star connected system, phase to phase voltage is 415V,  and Phase to neutral voltage is 230V

Figure above shows distribution system of typical facility with equally distributed load. Points A, B, C show possible places of neutral open

If neutral breaks at point A:

The voltage will continue to be normal till such time that the load are equal in all phases. Any imbalance in the load will cause changes in the voltage in phases. Technically all the phases are connected together and the currents cancel out so neutral is formed.

If neutral breaks at point B:

B phase will have 415 V. R & Y will still complete path through each other and effective voltage between then being 415V which will be equally dived across both loads. If the load changes the effective voltage across the loads can be calculate using the voltage divider rule

eg: voltage  across L3 can be calculated as (L3/(L2+L3))x 415V

If neutral breaks at point C:

R phase will have no continuity and Y&B phases will have voltage based on conditions discussed in above points

Trees falling on over head wires

Trees falling on over head wires or tree growing through them can cause phase to phase short circuit. Ideally there are breakers installed on lines for safety in such situation, but some times they do not operate due to rusting and non maintenance or some times lineman themselves bypass the breakers . this can cause 440V in secondary side of transformer or trigger Transformer blasts.

Transformer blast/ fault

These are generally  maintenance issues, and they can some time result in double phasing and 440V in single phase. In sept 2021, there was an incident in sangli where 400-500 homes experienced 440V in their homes and all equipments ON at that time like  TV, refrigerators, etc were damaged.

Other than this routine maintenance  or upgradation work involving underground cables can also trigger neutral open situation causing 440V even in city areas.

There will always be arguments on the probability of such accidents happening in cities being low, but if you look at even a district in general, there are atleast 10-15 incidents daily in different pockets of the region

Spikes & surges

Even if one ignores accidental issues like neutral open or in general  over voltage, every premise( home/ office / factories / shops etc) experiences min 100-200 spikes every day

Every switching operation (both ON & OFF) creates spikes. Some equipment switching every day

  1. Lights – 2-3 times
  2. Fans- 5-6 times
  3. AC thermostat- once every hour
  4. Refrigerator-  once every 2 hours
  5. Lifts – 15-20 time in one hour
  6. Geysers- 4-5 times a day

List goes on. 100-200 is conservative estimate. Multiply this with no of apartments/ galas/ offices in the building. All of them are getting supply from the same incoming cable in the building. Each individual premise is generating spike which is experienced by other premises in same building.

These spikes damage the electronics over a period of time. Also electronics now a days are designed to last for only 5-6 years. After this period the support for particular model is removed and spares are difficult to get. With easy EMIs available , one opts for buying new product instead and get a buy back. This also contributes to e waste

Lightning problem

Most of people assume that lightning rod on the roof makes our premises safe. This is only partially true, Lightning rod prevents structural damage and gives a safe path to lightning to go to ground. While it travels down through the wire to earth pit, the magnetic flux gets created and any metal surface or utility wire in flux will conduct the lightning impulse in the main line. This can damage the electronics.

Our solution

 We have solutions for all the above mentioned issues which are generally ignored by most.

We have products that can withstand 440V for more than 24 hours and can absorb spikes and lightning impulses thereby reducing damages, averting fire incidents and in effect reducing e waste.

Mumbai- 63A 3ph Equipower Lite installed for an office for voltage protection


This is a home voltage protector installed in mumbai for voltage protection of complete office. Prior to installation some of their LED lights were getting damaged. They were also concerned about problems like neutral open which can cause 440V in any particular phase.

Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for more than 24 hours. It is designed for this purpose specifically.

#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also  acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .

#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes.  However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.  

Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.

for queries, you contact us on 9769996205 or fill the form below

Nashik- 40A 1ph Equipower Lite installed for home


This is an installation done for customer in Nashik. This device is installed in main line and protects all the equipments in the house.


Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for indefinite period of time. It is designed for this purpose specifically.

#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also  acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .

#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes.  However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.  

Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.

Uttarakhand – 63A 3ph Equipower Lite installed for Home through a dealer for neutral open issue


This is a home voltage protector installed in uttarakhand for customer who has faced neutral open problem in his home. Prior to installation some of his equipment got damaged due to neutral open issue.

Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for more than 24 hours. It is designed for this purpose specifically.

#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also  acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .

#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes.  However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.  

Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.

for queries, you contact us on 9769996205 or fill the form below

63A 3ph Equipower Lite installed for Home in Nagpur


This is a home voltage protector installed in Nagpur for customer who has faced voltage problem in his home. Prior to installation some of his equipment got damaged due to voltage problems.


Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for more than 24 hours. It is designed for this purpose specifically.

#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also  acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .

#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes.  However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.  

Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.

for queries, you contact us on 9769996205 or fill the form below

63A 3ph Equipower Lite installed for Home in Kolkata


This is one customer who bought the item online from our online store https://msspowersys.myinstamojo.com/


Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for indefinite period of time. It is designed for this purpose specifically.

#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also  acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .

#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes.  However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.  

Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.

for queries, you contact us on 9769996205 or fill the form below

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