Miniature bulb Ba9S 12 V 3 W — 0.25 A
€7.90
Tax excluded
Miniature incandescent bulb Ba9S 12 V 3 W (0.25 A), tungsten filament — indicators, control panels, torches. DC or AC, no polarity.
Ba9S12 V0.25 A≈ 3 WØ 10 × 28 mm
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Secure payment by credit card or bank transfer.
Delivery policy
Dispatch within 2 to 5 days with tracked delivery.
Return policy
You have 14 days after receipt to make a return, in accordance with your right of withdrawal.
Fast delivery
France & Europe
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Card & bank transfer
Easy returns
Within 14 days
Expert advice
Lighting specialist, Strasbourg
The Ba9S 12 V miniature bulb draws 0.25 A, about 3 W: a tungsten filament in a glass envelope the size of a grape. It is the lamp of indicator lights and control panels, the one that has been showing a circuit is live since long before the LED existed.
Its first quality is that it asks for nothing. No polarity to respect, no resistor to work out, no driver: DC or AC, it lights. On an old industrial console or an original dashboard, that is what makes it irreplaceable — whereas an LED means checking the direction of current and sometimes adding a component.
⚠️ The decisive point is voltage. A 12 V lamp belongs on 12 V, within a few per cent. Under-fed it merely glows red; two volts over and it shines beautifully… then burns out within hours. Before ordering, read the value printed on the old lamp's cap, or measure the voltage at the holder.
Technical specifications
| Type | Miniature incandescent bulb |
|---|---|
| Cap | Ba9S (bayonet, single contact) |
| Rated voltage | 12 V |
| Current | 0.25 A |
| Power | ≈ 3 W |
| Dimensions | Ø 10 × 28 mm |
| Filament | Tungsten |
| Lifetime | ≈ 1,000 h |
| Supply | DC or AC, no polarity |
Key benefits
✓Ba9S cap — like-for-like replacement, no tools
✓Runs on DC and AC alike, with no polarity
✓No resistor, no driver: wire it straight in
✓Clean, instant light, CRI 100
Ideal for
Indicator and pilot lightsControl panels and industrial consolesTorches and lanternsToys, models, model railwaysSchool physics practicals
Frequently asked questions
Can I run it on another voltage?
No. A 12 V lamp tolerates only a few per cent either way. Two volts too many and the filament burns out within hours; two volts too few and it merely glows red. Check the actual voltage before choosing.
Can I replace it with an LED?
LEDs exist with the same Ba9S cap, but take care: on DC an LED imposes a direction of connection, and some monitoring circuits sense the filament to confirm the indicator is working. On those, an LED corrupts the diagnostic.
DC or AC?
Either. A filament heats the same way whichever way the current flows: this lamp lights just as well from a battery as from a transformer secondary, with no change to the wiring.
How do I read the reference?
Three values are enough: the cap (Ba9S), the voltage (12 V) and the current (0.25 A) — from which the power follows, 12 × 0.25 ≈ 3 W. If those three match your old lamp, the replacement is right.
Why order from STRASSELEC?
- ✓Lighting specialist — expert advice and professional references
- ✓Fast shipping from Strasbourg (France and Europe)
- ✓Secure payment by card or bank transfer
- ✓14-day returns (right of withdrawal)
Need advice, a batch or a large quantity? The STRASSELEC team is here to help.
Ba9S 12V 3W 250mA 10X28
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Miniature incandescent bulb Ba9S 12 V 3 W (0.25 A), tungsten filament — indicators, control panels, torches. DC or AC, no polarity.
Ba9S12 V0.25 A≈ 3 WØ 10 × 28 mm