This is what a buyer checks before they shortlist a electrical and electronics supplier.

What does a buyer check before selecting an electric motor?

They check power and speed against the driven load, the frame size and mounting against the machine, and the efficiency class, because minimum efficiency levels are now mandatory in most markets. Frame and mounting decide whether it is a drop-in replacement.

A maintenance engineer needs a motor that will bolt straight onto an existing machine without modification.

Reviewed 4 August 2026 · Written for electric motor manufacturers selling to business buyers

Buyer asks

What does a buyer check before selecting an electric motor?

Illustrative. The question is real; it is the one this guide answers.
WHAT THEY NEED TO BELIEVEWHAT SETTLES ITWHEN THEY ASKPower, speed, current, eff…Motor datasheetSelectionElectrical tests on the de…Routine test certificateAcceptanceConformity with the mandat…Efficiency class certificat…Regulatory compliance
Every claim on a supplier site has a document behind it or it does not. Buyers in electric motors know which is which.

What a buyer needs to identify the product

These are the fields a buyer scans before deciding whether you are worth contacting. Missing one of them usually ends the visit without an email.

  1. 1

    Rated power and speed

    The basic duty specification.

  2. 2

    Frame size and mounting arrangement

    Determines whether it fits without modification.

  3. 3

    Efficiency class

    Mandatory minimum levels apply in most markets.

  4. 4

    Enclosure and ingress protection rating

    Decides suitability for the environment.

  5. 5

    Insulation class and temperature rise

    Governs life at the operating temperature.

  6. 6

    Duty type

    Continuous, intermittent and short-time ratings differ.

  7. 7

    Voltage, frequency and connection

    Must match the supply and the starter.

The documents buyers ask for

Not all of them belong on a public page. Naming the ones you can issue is what separates a supplier who can be audited from one who cannot.

Documents buyers ask a electric motor manufacturer for, what each proves, and whether it belongs on the public site
DocumentWhat it provesWhere it belongs
Motor datasheetAsked at: selectionPower, speed, current, efficiency, power factor and dimensionsPublish it
Routine test certificateAsked at: acceptanceElectrical tests on the delivered motorPer shipment
Efficiency class certificationAsked at: regulatory complianceConformity with the mandatory efficiency level for the marketPublish it
Type test reportAsked at: technical evaluationFull performance testing of the designName it, share on request
Dimension drawingAsked at: mechanical designFrame, shaft and mounting dimensionsPublish it
Hazardous area certificationAsked at: hazardous installationsCertification for explosive atmospheres where requiredName it, share on request
Declaration of ConformityAsked at: before sale in regulated marketsConformity with the applicable directivesPublish it

Where electric motors sites lose the enquiry

Each of these is common, cheap to fix, and costs an enquiry that never arrives — so nobody ever reports it.

  • Frame size and mounting dimensions not published

    Most motor purchases are replacements. Without dimensions a buyer cannot tell whether it fits, and fit decides the order.

  • Efficiency class absent

    Minimum efficiency levels are legally mandated in most markets. A motor without a stated class cannot be sold into them.

  • Duty type not stated

    A motor rated for continuous duty and one rated for intermittent duty are different products at the same nominal power.

What the enquiry form should ask

A form that collects these can be answered properly the first time. A form that collects a name and a message cannot.

Enquiry form — electric motors

Enough to reply usefully, short enough that a buyer finishes it.

Power, speed and voltage required
The core duty.
Driven equipment and load characteristics
Starting torque requirements vary enormously.
Frame and mounting required
Determines fit.
Environment and protection rating
Wet, dusty and hazardous areas change the motor.
Efficiency class required
Often set by regulation or corporate policy.
Motor being replaced
The fastest route to a correct offer.

Questions suppliers ask

What is the most useful page for a motor manufacturer?

A dimension and frame table cross-referenced to the standard frame designations. Most motor purchases are replacements, and the buyer's question is whether yours fits the existing base. A table answers it in seconds and gets found by dimension searches.

How should efficiency be presented?

As the class under the standard the market recognises, with the measured efficiency at full and part load. Efficiency classes are regulated, so the class is a legal statement, and the part-load figures are what an engineer uses to estimate real running cost.

Do buyers need hazardous area information on the main page?

Enough to know whether a certified version exists and to which protection concept. Hazardous area buyers are a specific market with hard requirements, and being findable by them is worth far more than the space it takes.

Documents and standards named here are the ones buyers in this industry commonly ask for; requirements vary by market, customer and contract, so treat this as a starting checklist rather than a compliance list. Clearer pages can help discovery and evaluation. They do not guarantee rankings, AI citations, enquiries or revenue.

Illustrative

An enquiry from this search looks like: Power, speed and voltage required · Driven equipment and load characteristics · Frame and mounting required · Environment and protection rating

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