Thunder Rocker Switch On/off Spst 12V Amber Illuminated 20A TDR11057

The Thunder rocker switch, part number TDR11057, is a 12V, SPST on-off switch with contacts rated at 20A @ 12V. It uses 4 blade terminals and is described as amber LED illuminated, which gives it a clear visual indication for fitted electrical circuits.

It is a rocker-style switch with 2 positions and a mount length of 34.5mm. The listed mount size is 20mm x 35mm, so panel cut-out and available depth should be checked carefully before purchase to make sure the switch suits the installation space.

This is supplied as an each unit and sits in the auto electrical accessories group, alongside fuses, breakers, relays and switches. The listed warranty is one year, and the unit weight is 0.1kg.

Key Features

• 12V rocker switch
• 20A contact rating at 12V
• SPST on-off action
• Amber LED illuminated
• 4 blade terminals
• 2-position switch

Specifications

• Brand: Thunder
• Part number: TDR11057
• Product type: Switch
• Switch type: Rocker
• Switch action: On - Off - SPST
• Voltage: 12V
• Power rating: 20A
• Number of terminals: 4

Application and Buying Notes

Before ordering, confirm the panel opening is suitable for the listed mount size of 20mm x 35mm and allow for the 34.5mm mount length. Those measurements matter more than the switch body alone, especially where dash panels, control boxes or accessory panels have limited clearance behind the mounting face.

The 12V rating and 20A contact rating are the key electrical checks. Make sure the circuit you are working on is a 12V system and that the expected load stays within the 20A rating at 12V. As with any electrical component, the switch should be matched to the circuit design rather than guessed by appearance.

This switch has 4 blade terminals and SPST on-off operation, so it is intended for straightforward single-circuit control. Check the existing wiring arrangement, terminal style and the way the circuit is switched before fitting. If the vehicle or equipment uses a different terminal pattern, a different switch may be required.

The amber LED illumination is useful where a visible switched-on indication is wanted. If illumination is not part of the original setup, confirm that the wiring plan allows for the lamp function and that there is space for correct routing. The one year warranty applies to the item as supplied, but correct installation remains important for reliable operation.

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 TDR11057 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 One Year, Power Rating (Amp) 20, Voltage 12, Mount Length 34.5mm, Number of Poles 2, Switch Type Rocker, Switch Illumination Illuminated.

Additional published details for cross-checking include Product Group 2 FUSES BREAKERS RELAYS SWITCHES, Part No. TDR11057, Brand THUNDER, Description Thunder Rocker Switch On/Off SPST 12V Amber Illuminated (Contacts Rated 20A @ 12V), Number of Terminals 4, Switch Action On - Off - SPST, Lamp Colour/s Amber, Note Mount size 20mm x 35mm, Number of Positions 2, Item Type Switch.

Thunder Rocker Switch On/Off SPST 12V Amber Illuminated (Contacts Rated 20A @ 12V). Part number TDR11057 should be checked first. Listed voltage is 12. Listed output rating is 20. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number TDR11057, 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 voltage 12 and output 20 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Where no verified application list is available, the part number, mounting details, connector style, and published specifications should be used as the primary selection criteria.

Compatibility note: Confirm fitment by comparing the part number TDR11057, the 12V SPST on-off configuration, the 4 blade terminals, and the 20mm x 35mm mount size with your existing switch and panel opening before ordering.

FAQ

What is the part number for this Thunder rocker switch?

The listed part number is TDR11057. For this listing, part number TDR11057 is the main reference point. Listed voltage is 12. Listed output rating is 20. These details should still be checked against the original unit before ordering.

What voltage is this switch designed for?

It is listed as a 12V switch. For this listing, part number TDR11057 is the main reference point. Listed voltage is 12. Listed output rating is 20. These details should still be checked against the original unit before ordering.

What is the current rating?

The contact rating is 20A at 12V. For this listing, part number TDR11057 is the main reference point. Listed voltage is 12. Listed output rating is 20. These details should still be checked against the original unit before ordering.

How many terminals does it have?

It has 4 blade terminals. For this listing, part number TDR11057 is the main reference point. Listed voltage is 12. Listed output rating is 20. These details should still be checked against the original unit before ordering.

What is the switch action?

It is an SPST on-off rocker switch with 2 positions. For this listing, part number TDR11057 is the main reference point. Listed voltage is 12. Listed output rating is 20. These details should still be checked against the original unit before ordering.

What mounting size should be checked before buying?

The listed mount size is 20mm x 35mm, with a mount length of 34.5mm. Both should be checked against the panel opening and available clearance. For this listing, part number TDR11057 is the main reference point. Listed voltage is 12. Listed output rating is 20. These details should still be checked against the original unit before ordering.