Tridon Stop Light Switch TBS021 M12 X 1.5 Normally Closed

The Tridon Stop Light Switch is a switch-type automotive electrical part supplied as a single each, with part number TBS021 and a two-year warranty. It is described as a normally closed circuit stop light switch, which makes it important to match the electrical operation as well as the thread and spanner size when replacing an existing unit.

Key physical details are clearly defined: 14 mm spanner, M12 x 1.5 thread, and normally closed circuit. Those three points are the main checks to make before ordering, because stop light switches can look similar while differing in thread size, wrench size, or circuit operation.

This Tridon switch sits in the auto electrical accessories group and the fuses, breakers, relays, switches group. It is listed under the description Tridon Stop Light Switch, and the part number TBS021 should be used as the primary identifier when comparing against the old part or vehicle application information.

Key Features

• Tridon stop light switch
• Part number TBS021
• Normally closed circuit
• 14 mm spanner size
• M12 x 1.5 thread
• Supplied each

Specifications

• Brand: Tridon
• Type: Switch
• Unit of measure: Each
• Warranty: Two years
• Product group 1: Auto electrical accessories
• Product group 2: Fuses, breakers, relays, switches

Fitment guidance

• Fitment information includes Alfa Romeo 33 and Alfa Romeo Alfasud applications.
• The fitment preview also shows Alfa Romeo 33 model years 1990, 1991, 1992, 1993 and 1994.
• The fitment preview also shows Alfa Romeo Alfasud model years 1974, 1975, 1976, 1977 and 1978.
• Use the part number TBS021 and the physical thread and circuit details to confirm the correct match before purchase.

Application and Buying Notes

Before buying, confirm the existing switch uses an M12 x 1.5 thread and a 14 mm spanner size, because those measurements are often the quickest way to separate a matching stop light switch from a similar-looking one. The Tridon TBS021 is also described as normally closed, so the electrical function must align with the replacement requirement.

If you are matching against a removed part, check the marking on the old switch and compare it with TBS021 before fitting. The part is sold as a single each item, so it is suitable where one stop light switch is being replaced rather than a kit or multi-pack.

The listed fitment references point to Alfa Romeo 33 and Alfa Romeo Alfasud applications, but vehicle changeovers can vary across years and build details. For that reason, it is best to verify the part number, thread, spanner size and circuit type together rather than relying on model name alone.

A two-year warranty is listed for this Tridon switch, which is useful for buying confidence, but it does not remove the need to confirm compatibility. Correct thread engagement and the right circuit operation are still essential for a proper installation and safe brake light function.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number TBS021 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type SWITCH, Unit of Measure EACH, Warranty Two Years, Product Group 1 AUTO ELEC ACCESSORIES, Part No. TBS021, Brand TRIDON, Description Tridon Stop Light Switch, Product Group 2 FUSES BREAKERS RELAYS SWITCHES.

Tridon Stop Light Switch. Part number TBS021 should be checked first. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number TBS021, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a switch in workshop, fleet, trade, agricultural, or construction service, the listed electrical specification should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991, ALFA ROMEO 33 1992. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

The listed warranty is Two Years. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Please confirm compatibility by matching part number TBS021, M12 x 1.5 thread, 14 mm spanner size, and normally closed circuit against the vehicle application before ordering.

FAQ

What is the part number for this stop light switch?

The part number is TBS021. For this listing, part number TBS021 is the main reference point. Published fitment references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991. These details should still be checked against the original unit before ordering.

What thread does this switch use?

It uses an M12 x 1.5 thread. For this listing, part number TBS021 is the main reference point. Published fitment references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991. These details should still be checked against the original unit before ordering.

What is the spanner size?

The listed spanner size is 14 mm. For this listing, part number TBS021 is the main reference point. Published fitment references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991. These details should still be checked against the original unit before ordering.

Is the circuit normally open or normally closed?

It is listed as normally closed. For this listing, part number TBS021 is the main reference point. Published fitment references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991. These details should still be checked against the original unit before ordering.

What vehicle applications are shown?

The fitment information references Alfa Romeo 33 and Alfa Romeo Alfasud applications, including Alfa Romeo 33 model years 1990 to 1994 and Alfa Romeo Alfasud model years 1974 to 1978. For this listing, part number TBS021 is the main reference point. Published fitment references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991. These details should still be checked against the original unit before ordering.

Does it come with a warranty?

Yes, a two-year warranty is listed. For this listing, part number TBS021 is the main reference point. Published fitment references include ALFA ROMEO 33, ALFA ROMEO 33 1990, ALFA ROMEO 33 1991. These details should still be checked against the original unit before ordering.