Switch mode power supplies are the workhorses of modern electronics power conversion — compact, efficient units that convert mains AC into the regulated DC that computers, LED lighting, industrial equipment, telecom hardware, and countless other systems need. Standalone SMPS units, sold as power modules and supplies in their own right rather than built into a finished appliance, are used across industry and infrastructure. Because they sit across the boundary between hazardous mains voltage and the low-voltage side that connected equipment and people touch, their safety is critical, and standalone SMPS units fall under the BIS Compulsory Registration Scheme (CRS). A covered SMPS must be registered before it can be imported or sold in India, making BIS CRS registration the mandatory gateway to the power-supply market.

SMPS units are a component-and-infrastructure category — bought by equipment makers, integrators, and industrial users — where reliable safety and credible certification are central to the commercial offer. This guide focuses on the CRS registration and places it in the context of the wider compliance picture for standalone power supplies.

Why Standalone SMPS Fall Under CRS

The Compulsory Registration Scheme operates under the Electronics and Information Technology Goods (Requirement of Compulsory Registration) Order, administered by BIS under the BIS Act, 2016. Standalone switch mode power supplies are notified under CRS, meaning a covered unit must be tested against the applicable Indian Standard, registered with BIS, and marked with its registration number before it can be manufactured, imported, sold, distributed, or stored for sale in India.

The safety rationale is direct. An SMPS is connected to the mains and converts that hazardous voltage down to a usable low voltage; the isolation it provides is the primary barrier protecting connected equipment and users from electric shock. A substandard supply with inadequate isolation, poor components, or weak construction is a common root cause of shock and fire incidents in the equipment it powers. CRS ensures every standalone SMPS meets a common safety baseline verified by India-specific testing. Selling an unregistered notified SMPS is an offence under the BIS Act, and registration is also a commercial gate: equipment makers and industrial buyers verify it, and customs checks it at import.

The Applicable Standard

Standalone SMPS units are registered under the Indian Standard for the safety of information technology / electronic equipment — historically IS 13252 (Part 1) (adopted from IEC 60950-1), with the sector transitioning toward the unified hazard-based standard IS 62368-1. For a power supply, the isolation between the mains input and the low-voltage output is especially central to the safety assessment. Manufacturers should confirm the exact applicable standard and its current edition for the SMPS against the latest BIS notification before testing, since registering against a superseded standard can invalidate the application. Whichever standard applies, the unit must be tested at a BIS-recognised laboratory and shown to conform before it can be registered.

What the CRS Safety Test Examines

For a power supply, the safety test is dominated by one theme above all: isolation. The laboratory verifies that the barrier separating the mains-connected primary side from the low-voltage secondary side is robust — with adequate creepage and clearance distances on the circuit board, sound insulation in the transformer, and components rated to hold that separation even under fault. This is the single most important safety property of an SMPS, because a breakdown of that barrier puts mains voltage onto the output that connected equipment and people contact.

Beyond isolation, the test examines thermal performance under full load, since SMPS units run warm and a poorly designed one can overheat; fire containment in the event of an internal fault; and the behaviour of the supply under output short circuit and overload. Cheap supplies are precisely the products most likely to skimp on isolation distances and component ratings to shave cost, which is why India insists that each be proven safe through local testing rather than accepted on an overseas certificate alone.

A Foundational Component for Everything Downstream

Standalone SMPS occupy a position similar to batteries in the electronics ecosystem: they are rarely the end product but a foundational component that powers other products, and their safety propagates directly into everything built around them. An equipment maker designing an SMPS into a machine relies on the supply being safe and, in many cases, on its being properly registered, so an SMPS maker’s certification is an enabler for a whole chain of downstream equipment.

This dual role — serving both direct buyers of power modules and the equipment manufacturers who integrate them — makes credible, current CRS registration a core part of the commercial offer, because serious equipment makers will insist on a registered, conforming supply before designing it in. It also means that an SMPS manufacturer’s registration strategy should reflect the real product range: power supplies come in many wattages and voltage outputs, often on shared design platforms, so series/family grouping can cover a broad catalogue efficiently where the platform genuinely supports it, while genuinely different designs need their own coverage. Getting this mapping right keeps a wide SMPS portfolio both compliant and cost-effective to certify.

Step-by-Step: BIS CRS Registration for an SMPS

CRS is a test-and-register scheme with no factory inspection. Our team manages each stage end to end, but every applicant should understand the sequence.

1. Confirm the standard and edition. Verify the current applicable safety standard for the SMPS and its edition.
2. Test at a BIS-recognised laboratory. Submit SMPS samples for testing against the applicable standard, with particular attention to isolation and thermal performance.
3. Prepare documentation. Compile technical details, ratings, critical-component data, company and brand documents, and — for foreign makers — the Authorised Indian Representative (AIR) nomination.
4. File the online application. Submit on the BIS portal with the test report and documents.
5. BIS scrutiny and grant. BIS reviews and grants the registration with a unique R-number.
6. Mark and self-declare. Apply the standard mark and R-number on the unit and packaging, and issue the self-declaration.
7. Maintain and renew. Keep conformity under BIS surveillance and renew periodically; act on the registration if critical components change.

Documents Required

A complete file at the outset is the biggest single lever on approval speed. You will typically need:

• Test report from a BIS-recognised laboratory against the applicable standard
• Product technical specifications, input/output ratings, and datasheets
• Critical-component details (transformer, optocoupler, output stage)
• Bill of materials
• Company registration and business documents
• Trademark / brand authorisation documents
• Details of the manufacturing unit
• For foreign manufacturers: Authorised Indian Representative (AIR) nomination and undertakings
• Marking / label artwork showing the standard reference and R-number
• Authorised signatory details and application declarations

Foreign manufacturers hold the CRS registration in their own name and must appoint an AIR resident in India; the importer relies on that registration.

Timeline and Cost Planning

A realistic CRS schedule for an SMPS is commonly a few weeks to a couple of months end to end, with laboratory testing the pacing item. Once a complete application with a valid test report is filed, BIS scrutiny and grant are relatively quick. Costs are dominated by laboratory testing fees, followed by BIS application and registration fees and, for foreign makers, the AIR arrangement. Because SMPS families share design platforms across wattages and outputs, BIS series/family guidelines can allow related units to be grouped, reducing per-model testing — a significant lever for a broad power-supply catalogue. The EPR registration should be handled in parallel.

Common Mistakes That Delay an SMPS Registration

• Skimping on isolation. Isolation is the dominant safety property; a design that fails isolation testing cannot be registered.
• Testing to the wrong standard edition. With the transition toward IS 62368-1, confirm the current standard before testing.
• Importer-as-registrant confusion. The manufacturer holds the CRS registration; foreign makers must appoint an AIR.
• Critical-component changes. Changing the transformer or other isolation-critical components can require action on the registration.
• Ratings/marking mismatches. Input/output ratings and brand/model on the unit, label, test report, and application must match exactly.
• Over-broad grouping. Stretching one report across genuinely different designs is not defensible.

SMPS Within the Wider Compliance Picture

SMPS certification connects to the broader compliance and environmental picture:

• Downstream equipment registration — the products the SMPS powers carry their own CRS registrations; see our BIS CRS registration service.
• EPR for e-waste — producers and importers of electronic equipment must hold EPR registration for e-waste with CPCB.
• Import compliance — imported units or components may involve DGFT licensing considerations.
• Legal Metrology (LMPC) — SMPS sold as pre-packaged products require LMPC registration where applicable.

A coordinated plan aligns the SMPS’s CRS registration with EPR and the registrations of the equipment it powers.

Pre-Launch Compliance Checklist for SMPS

Before committing to a shipment, run this verification sequence. First, confirm the current applicable safety standard for the SMPS and obtain a passing test report with isolation and thermal performance verified. Second, ensure the manufacturer is set up as the CRS registration holder, with a resident AIR for foreign makers. Third, verify EPR (e-waste) is registered. Fourth, align the input/output ratings, brand, and model across the unit, label artwork, test report, and application, with the marking showing the standard reference and R-number. Fifth, use series grouping across the SMPS family only where designs genuinely share a platform.

For ongoing operations, maintain a compliance register per unit/family: R-number and validity, the standard and edition, ratings and critical-component details, and EPR records — so component changes and renewals are handled proactively.

Frequently Asked Questions

Is BIS CRS registration mandatory for standalone SMPS?

Yes. Standalone switch mode power supplies are notified under CRS and must be tested against the applicable Indian Standard, registered with BIS, and marked with the R-number before being imported or sold in India.

Which standard applies?

The IT/electronic-equipment safety standard — historically IS 13252 (Part 1), transitioning toward IS 62368-1 — with isolation between mains and output especially central. Confirm the current edition.

Why is isolation so important?

Because the isolation barrier is what protects connected equipment and users from mains voltage; a breakdown puts hazardous voltage onto the output, so it is the dominant focus of the safety test.

Can a family of SMPS be grouped?

Often yes, where the units genuinely share a design platform across wattages and outputs. Genuinely different designs need their own coverage.

Who holds the registration?

The manufacturer, Indian or foreign. Foreign manufacturers register in their own name and must appoint an Authorised Indian Representative resident in India.

How long does registration take?

Commonly a few weeks to a couple of months, with laboratory testing the pacing item. Preparing complete isolation and component documentation up front, and grouping a family of supplies where the platform allows, is the best way to keep a broad catalogue on track.

Why Choose PCN India Global

• Power-supply expertise — we manage standalone SMPS registration with focus on isolation and thermal performance
• Portfolio grouping — we group SMPS families on shared platforms to certify a broad catalogue efficiently
• Lab coordination — testing at BIS-recognised laboratories, right the first time
• AIR for foreign makers — we act as your Authorised Indian Representative and hold the India compliance interface
• EPR integration — we set up the e-waste obligation alongside CRS
• Surveillance and renewal tracking — so your R-numbers stay valid and component changes are managed

PCN India Global manages the complete BIS CRS registration process for standalone switch mode power supplies — from isolation and thermal testing to R-number grant and renewal, coordinated with the EPR obligations these products carry. Contact us: WhatsApp +91 80109 05029, email bdm@pcnindiaglobal.com, or start your application today.