How to Spot a Counterfeit ISI Mark Before You Stock It
A counterfeit ISI mark is a printing job. The logo is a shape, and anyone with a mould or a printer can put it on a product that has never been tested. What cannot be copied is the licence record behind it — which is why the useful check takes about a minute and looks at a number rather than a symbol. We manufacture switches, sockets and MCBs under BIS licence at our own plants in Mumbai, so here is what we look for, and what a dealer should look for before a carton goes on the shelf.
Key takeaways
- The ISI logo means nothing on its own. A genuine mark always carries a CM/L licence number — a logo with no number is the commonest fake signal there is.
- Verify the number on the BIS public licence database, and confirm it resolves to this product, this standard and this manufacturer. It is free and takes under a minute.
- Know the standards: IS 3854 for switches, IS 1293 for plugs and sockets, IS/IEC 60898-1 for MCBs. A mismatch is a printing error, not a certification.
- Physical tells: a blurred or rubbing-off mark, noticeably light weight, thin brass, and packaging with a brand but no manufacturer address.
- The liability sits with the seller. Selling uncertified accessories in a mandatory category is an offence under the BIS Act — and the electrician blames your counter, not the factory.
What the ISI mark actually certifies
The ISI mark is not a quality badge a manufacturer awards itself. It means the Bureau of Indian Standards has granted that specific factory a licence to make that specific product to a specific Indian Standard, and that BIS can turn up and test it. The certification is tied to a product made at a place, not to a brand name.
That is why the licence number matters more than the logo. The logo is a shape anyone can print. The number points at a record.
For electrical accessories the mark is not optional. Switches, sockets, plugs and MCBs fall under mandatory certification — an uncertified one is not a budget option, it is not legally sellable.
The one check that catches most fakes: the CM/L number
Every genuine ISI mark is accompanied by a licence number in the form CM/L-1234567890. It is the single most useful thing on the product, and it is what counterfeiters most often get wrong.
No number at all The commonest fake signal by a wide margin. An ISI logo standing alone, with no CM/L anywhere on the product or the box, is not a genuine mark.
A number that verifies to a different product Real licence, borrowed. It happens: a number belonging to a certified product gets printed on an uncertified one from the same or a different factory.
A number that verifies to nothing Invented. Plausible format, no record behind it.
A number that verifies to this product, this standard, this maker What you are looking for.
Check it against the BIS public licence database, not against the supplier’s word. It is free, it takes under a minute, and it is the only step here that cannot be faked.
| What you check | Genuine | Counterfeit |
|---|---|---|
| CM/L licence number | Present on the product itself | Missing, invented, or borrowed |
| BIS database lookup | Resolves to this product and maker | No record, or a different product |
| Standard number | Matches the product category | Wrong category or does not exist |
| Mark quality | Moulded or cleanly printed | Blurred, or rubs off |
| Weight and materials | Full-weight brass and plastic | Noticeably light |
| Packaging | Maker name, full address, batch code | Brand only, no address |
| Invoice | Proper GST invoice | Cash, no paperwork |
Know which standard should be printed
A counterfeit often carries a real-looking mark against the wrong standard number, because whoever printed it copied from a different product. Knowing the handful of numbers that apply to electrical accessories turns that into an obvious error.
The standards you will meet at an electrical counter
Bars are equal because these are labels, not quantities. Always confirm the current standard and its revision year on the BIS site — standards are revised.
Mismatch A socket carrying the switch standard, or an MCB carrying a lighting standard, is a printing job rather than a certification.
A standard that does not exist Transposed digits are common. If the number does not resolve on the BIS site, treat it as a fake.
An ISI logo with no CM/L licence number is not a genuine mark.
Product, standard and manufacturer must all match the record.
The saved material is what overheats at a 16A contact.
Under the BIS Act the offence reaches the counter, not just the factory.
What a fake looks like in the hand
Before any database, there is what the product tells you when you pick it up. None of these is conclusive on its own; two or three together are enough to stop and verify.
Mark quality A genuine mark is moulded or cleanly printed and survives a thumbnail. A blurred, smudged or slightly wrong-proportioned logo is the cheapest tell there is.
Rubs off If the marking comes away with a fingernail or a little solvent, it was added after manufacture.
Weight and feel Counterfeit accessories are usually lighter. Thin brass, less copper, thinner plastic — and it is exactly those savings that cause the failure.
Packaging without an address A carton with a brand and no manufacturer name and full address is a problem. Genuine packaging carries both.
Spelling and finish Misspellings on the carton, inconsistent fonts between the product and the box, a missing batch code.
The failure mode is not cosmetic. A socket with under-specified brass heats at the contact under a 16A load — and it is your counter the customer comes back to.
The commercial tells — before you even see the product
Most counterfeit stock arrives through a deal that looked good. The pattern repeats often enough to be worth naming.
Well below the rate everyone else quotes Certification, testing and correct materials all cost money. A price meaningfully under the market is telling you which of those has been skipped.
Cash only, no proper invoice No GST invoice means no traceability, and no traceability is the point.
Urgency Limited stock, decide today, another dealer is asking. Pressure exists to prevent exactly the checks described here.
Will not name the plant A genuine manufacturer will tell you where the product is made and hand over the licence number without being pushed.
Documents offered unprompted Test reports, licence numbers and a full address, given before you ask, are a good sign.
Where counterfeits actually enter the chain
Counterfeit accessories rarely arrive labelled as such. They enter through gaps in the supply chain, and the gaps are predictable enough that a dealer can close most of them by deciding where to buy.
The long chain Every additional hand between the plant and your shelf is another place stock can be substituted. A product that has passed through four traders cannot be traced back through them.
Clearance and liquidation lots Mixed cartons, no consistent batch codes, a story about a cancelled order. Sometimes genuine; disproportionately not.
Genuine brand, counterfeit code The nastiest version. A supplier sends mostly real stock with one or two fast-moving codes substituted, because those are the ones nobody inspects.
Online marketplace sellers Fine when the seller is the manufacturer or an appointed distributor. Check which, rather than trusting the brand name on the listing.
Direct from the plant One hand, full traceability, and the licence numbers come with the order.
Spot-check your fastest-moving codes, not the unusual ones. Substitution targets volume, because that is where it pays and where it is least likely to be noticed.
How to verify, in order
Four steps. The first two take a minute between them and catch the overwhelming majority.
1 Find the CM/L number on the product itself, not only on the carton.
2 Look it up on the BIS public licence database and confirm it resolves to this product, this standard and this manufacturer.
3 Check the standard number matches the product category.
4 Ask the supplier for the test report and the manufacturer’s full address, and check it against the carton.
Do this once per new supplier and once per new product code, not once per carton. It is a few minutes at the start of a relationship, not an ongoing tax on your time.
ISI, BIS, CE and the marks that mean nothing
Counterfeiters rely on the fact that one mark looks much like another. Several of the symbols you will see on electrical packaging in India carry no Indian certification at all, and two of them are designed to be mistaken for ones that do.
What each mark on the carton is actually telling you
Only the top two are certifications you can look up. A CE mark is not wrong to carry, but it certifies nothing for the Indian market.
“ISI type” or “ISI standard” Deliberate weasel wording. It is not a certification claim and it is chosen precisely because it is not legally one.
CE on an Indian-market accessory Not a fake in itself, but it does not substitute for BIS certification in a mandatory category.
BIS registration A genuine separate scheme covering certain electronics. It is not the ISI mark, and for switches and sockets the ISI licence is what applies.
What you are risking if you stock it
Dealers sometimes treat this as the manufacturer’s problem. It is not. The counter that sold it is the one the customer, and the inspector, comes to.
Legal exposure Selling uncertified goods in a mandatory certification category is an offence under the BIS Act, and it applies to the seller.
Safety These are failures at a live connection — overheating, arcing, fire. The consequences are not commercial.
Your name An electrician who fits a failing switch blames the counter that supplied it, and he tells the other electricians.
Insurance and liability A fire traced to uncertified accessories is a difficult conversation with an insurer for you and for your customer.
The margin on a suspiciously cheap carton is a few hundred rupees. The liability is not capped at a few hundred rupees.
If you already have suspect stock
Finding it after the fact is common and is not a reason to do nothing. Sitting on it is worse than the original purchase, because it is now a decision rather than a mistake.
Stop selling it First and immediately, before anything else is decided.
Separate it Physically, off the selling shelf, so nobody sells it by accident during a busy afternoon.
Go back to the supplier With the licence number and what it did or did not resolve to. A genuine supplier will want to know; a counterfeiter will stop answering, which is itself the answer.
Report it BIS takes complaints about misuse of the mark, and it is the only thing that removes the source.
Do not quietly clear it at a discount That moves the risk to a customer and keeps your name on it.
Buying so the question does not arise
All of the above is a check on stock you have already been offered. The structural fix is upstream.
Buy from the manufacturer or an appointed distributor The shorter the chain, the fewer places a counterfeit can enter it.
Keep the paperwork GST invoices and test reports filed by supplier. If a question is ever asked, this is the answer.
Verify a new supplier properly, once Licence numbers, address, and a plant you can name.
Ask about the plant A manufacturer making its own product will talk about it. We make ours at our own plants in Marol, Andheri East, Mumbai — this is what that looks like, and this is how it is tested.
If you are choosing a supplier rather than checking a carton, the questions in our dealership cost guide and the dealer appointment process cover what else to ask.
The short version
One habit prevents nearly all of this: never accept a logo as evidence. The mark is a claim; the licence number is the claim you can check.
Find the CM/L number On the product, not just the box.
Verify it on the BIS database Product, standard and maker must all match.
Treat a low price as a question Not as a win.
Refuse a mark with no number Every time, without exception.
Our switches, sockets and MCBs carry published licences, and we will give you the numbers to check before you place an order. The full range is on our products page.
FAQs
How can I tell if an ISI mark is fake?
What is a CM/L number on an ISI mark?
Which ISI standard applies to switches and sockets?
Is it illegal to sell electrical products without an ISI mark in India?
What should I do if I have already bought counterfeit stock?
Why are counterfeit electrical accessories dangerous?
Why buyers choose Vinayak Electricals
- Over 30 years manufacturing electrical accessories in India, not importing and rebadging them.
- Published BIS licences — our MCBs are made under IS/IEC 60898-1 and we will give you the numbers to check before you order.
- ISO 9001:2015 certified manufacturing at our own plants in Marol, Andheri East, Mumbai.
- 2000+ in-house products across KEMPS, VIZA and VIYONA, made on our own lines under our own quality system.
- A plant you can name — and visit. Traceability starts with knowing where a product was actually made.
- Proper paperwork on every order, because the invoice and the test report are what protect your counter later.
Stock accessories you can verify
We will give you the licence numbers, the standards and the test reports before you place an order — so the check described here takes you a minute and comes back clean.
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