Tridon Stop Light Switch TBS121 Normally Open

The Tridon Stop Light Switch, part number TBS121, is a vehicle electrical switch supplied as each and listed with a normally open circuit. It sits in the auto electrical accessories group and is also classified under fuses, breakers, relays and switches, which makes it a straightforward replacement item when the existing brake light switch needs to be matched by part number and application.

This switch is catalogued under Tridon and identified simply as a switch type product. The listed features are limited and specific: no spanner size is provided, no thread detail is provided, and the circuit is normally open. That means the key buying checks are the part number TBS121 and the vehicle application rather than assuming any physical or connector details that are not stated here.

For buyers comparing options, the most useful details are the Tridon brand, the stop light switch description, and the two-year warranty. Those facts make it easier to line up a direct replacement search, but they do not replace a careful check against the vehicle’s original switch specification, especially where brake light circuit operation and mounting style must match exactly.

Key Features

• Tridon stop light switch
• Part number: TBS121
• Circuit: normally open
• Supplied as each
• Two-year warranty
• No spanner size listed

Specifications

• Brand: Tridon
• Product type: Switch
• Description: Tridon Stop Light Switch
• Part No.: TBS121
• Unit of measure: Each
• Warranty: Two Years
• Product group 1: Auto Elec Accessories
• Product group 2: Fuses Breakers Relays Switches

Fitment guidance

• Listed applications include Mercedes-Benz passenger vehicles.
• Fitment references shown include Mercedes-Benz C-Class.
• Fitment references shown include Mercedes-Benz CLC-Class.
• Fitment references shown include Mercedes-Benz CLK.
• Fitment references shown include Mercedes-Benz SLK.
• Model-year references shown in the data include Mercedes-Benz C-Class 2002 through 2012.

Application and Buying Notes

When replacing a stop light switch, the part number and circuit operation matter just as much as the vehicle badge. This Tridon unit is TBS121 and is described as a normally open switch, so the safest approach is to compare those details against the original switch fitted to the vehicle before ordering. The listing does not provide a spanner size or thread specification, so those physical details should not be assumed.

The fitment information supplied points to Mercedes-Benz applications, including C-Class, CLC-Class, CLK and SLK references, with C-Class model-year entries shown from 2002 through 2012. That is useful for narrowing the search, but it is still important to verify the exact vehicle variant, year and original switch specification against the vehicle already fitted.

Because this is an electrical switch, a mismatch can affect brake light operation. Confirm the replacement style, mounting arrangement and circuit type on the existing part rather than relying on the model name alone. If the original switch is marked differently, or if the vehicle uses a different switch arrangement, the correct replacement may not be this TBS121 part.

The two-year warranty gives a clear service period on the listed item, but warranty support does not confirm vehicle suitability. Treat the warranty as a product assurance detail and the fitment references as a guide only. The final check should always be the original part number, the vehicle application and the switch configuration already in the car.

If you are matching the part for a workshop job or a parts counter order, it helps to have the removed switch in hand. Compare the old unit’s markings, circuit behaviour and physical layout with this Tridon TBS121 switch before fitting. That is the most reliable way to avoid returning the wrong stop light switch for a Mercedes-Benz application.

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 TBS121 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. TBS121, Brand TRIDON, Description Tridon Stop Light Switch, Product Group 2 FUSES BREAKERS RELAYS SWITCHES.

Tridon Stop Light Switch. Part number TBS121 should be checked first. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number TBS121, 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 MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2002, MERCEDES-BENZ C-CLASS 2003, MERCEDES-BENZ C-CLASS 2004. 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 fitment by checking the Tridon part number TBS121, the normally open circuit detail, and the vehicle application against the original stop light switch before purchase.

FAQ

What is the part number for this stop light switch?

The part number listed is TBS121.

What circuit type does this switch have?

It is listed as a normally open circuit switch.

Which brand is this stop light switch?

The brand is Tridon.

What vehicles are referenced in the fitment information?

The supplied fitment references include Mercedes-Benz C-Class, CLC-Class, CLK and SLK applications, with C-Class model-year references shown from 2002 to 2012.

Is a spanner size or thread specification provided?

No. The listed features show spanner: - and thread: -, so those details are not provided.

What warranty is listed for this switch?

The listed warranty is two years.