Historical low side/rear; W40S12BS4A5-57/T03A1 identity supported by its archived rear label. Three lead segments visible; supplied dimensions, harness and pinout unverified.
Historical harness-side view with three red/blue/yellow leads and white housing. Archived rear records W40S12BS4A5-57/T03A1; supplied termination and pinout unverified.
Historical low side/rear; W40S12BS4A5-57/T03A1 identity supported by its archived rear label. Three lead segments visible; supplied dimensions, harness and pinout unverified.
Historical harness-side view with three red/blue/yellow leads and white housing. Archived rear records W40S12BS4A5-57/T03A1; supplied termination and pinout unverified.
Technical media Confirm label, connector and fit
Historical low side/rear; W40S12BS4A5-57/T03A1 identity supported by its archived rear label. Three lead segments visible; supplied dimensions, harness and pinout unverified. Fan label photo
Historical low side/rear; W40S12BS4A5-57/T03A1 identity supported by its archived rear label. Three lead segments visible; supplied dimensions, harness and pinout unverified. Side view
Historical low side/rear; W40S12BS4A5-57/T03A1 identity supported by its archived rear label. Three lead segments visible; supplied dimensions, harness and pinout unverified. Dimension drawing
Nidec

Nidec W40S12BS4A5-57 T03A1 12V DC Cooling Fan

Available: Confirm availability
Compatibility checkpoint

Confirm Fit Before Ordering

Use this quick check first, then review the full Product Specifications tab before placing an order.

Before ordering: Compare the original fan label, frame size, rated voltage/current, connector, wire count, airflow direction and mounting holes.
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Price
$17.49
Need confirmation before ordering?

Share the original fan label, connector photo, or target quantity so the team can check compatibility or quote bulk supply.

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Reference model: W40S12BS4A5-57

Product Specifications

Review the technical data used for replacement matching, procurement comparison and engineering approval.

Historical listing photographs: The gallery retains existing views from this listing's historical image set. They are not proof of current shipping stock. Complete original photographs and their source history remain in store records outside the current gallery.

Historical nameplate record: Nidec W40S12BS4A5-57; separate T03A1; photographed 12 V DC, 0.73 A.

The retained low side/rear and harness-side views are complete unit photographs. Full historical nameplate identity is supported by this listing's archived oblique rear. Three red/blue/yellow leads and a white housing are visible; supplied harness functions and pinout are unverified.

Before ordering, confirm the full supplied model and option, electrical label, measured dimensions, condition, complete harness, connector and pinout. Historical images do not establish those offered-unit details.

Supplied unit verification required

Historical labelled rear and side views identify Nidec W40S12BS4A5-57 with T03A1, 12V DC and 0.73A. The pictured harness has three visible red, blue and yellow leads and a white housing. The earlier body text describing four leads was incorrect. This is a photographic observation, not a guarantee of the supplied harness.

Historical images and annotations do not establish current shipping stock, condition, an unedited camera original, supplied electrical characteristics or equipment compatibility. Before ordering, confirm the full supplied label and option, measured dimensions, mounting, actual harness, connector keying and pinout. Send label and connector photographs for matching help.

W40S12BS4A5-57 T03A1 specifications and selection

The original product photographs identify Nidec W40S12BS4A5-57, with the separate label marking T03A1. The electrical label states 12V DC and 0.73A. These are observations from the pictured item; a manufacturer specification matching this complete version has not yet been independently confirmed.

Photographed model W40S12BS4A5-57
Additional label marking T03A1; retain when comparing versions
Photographed electrical label 12V DC / 0.73A
Visible connection Three visible red/blue/yellow leads and a white housing in the historical photographs; supplied harness, functions and pinout require confirmation
Mounting dimensions Not independently confirmed for the exact pictured version

What should I check before ordering?

Compare the complete label, any additional version marking, mounting holes, frame depth and fitted connector. Dimensions, speed, airflow, pressure, noise and bearing need an exact version-specific document or a physical measurement where appropriate. Lead count alone does not establish PWM or tachometer functions.

Request the archived historical photograph and label record

For help comparing the full label and connector, send a fan photo.

Replacement confirmation

Compatibility Verification Checklist

Before ordering, please confirm these critical points:

  1. 1
    Exact model number on the original fan label
  2. 2
    Frame size: length, width and thickness
  3. 3
    Rated voltage and current
  4. 4
    Connector type and wire sequence
  5. 5
    Wire count: 2-wire, 3-wire or 4-wire PWM
  6. 6
    Airflow direction and mounting hole position
  7. 7
    Cable length and application environment

Still unsure? Send us photos of your fan label, connector and equipment. We will help check compatibility before you order.

Send Fan Photos Ask for Compatibility Check

Datasheet / Drawing

Use official documents and dimensional references when available. If a document is missing, contact us before ordering for replacement matching support.

Datasheet URL Contact us to confirm
Dimension drawing View drawing image

Bulk Order

For repair batches, OEM projects or distributor replenishment, send the model number, target quantity, connector requirements and delivery destination.

Reference model W40S12BS4A5-57
Manufacturer / brand Nidec
Request Bulk Quote

Shipping & Returns

Shipping options, lead time and return eligibility may vary by product, quantity and destination. Confirm compatibility before ordering replacement fans.

  • For bulk orders, request freight planning and availability confirmation before payment.
  • For replacement orders, compare model, size, voltage, current and connector before installation.
  • Unused items should remain in original condition for return review according to store policy.

FAQ

Common checks for replacement cooling fan sourcing.

Can you help match an old fan?

Yes. Send photos of the fan label, connector and equipment so we can check model, voltage, frame size and wiring.

Can I use a different brand as a replacement?

Often yes, but only after confirming frame size, electrical rating, airflow requirement, bearing type, connector and wire sequence.

What information is needed for a bulk quote?

Send part number, quantity, target lead time, connector or cable requirements and shipping destination.