Narva Sealed Rocker Switch Off/momentary On Spst 12V Red Illuminated 20A Part No. 63129BL

The Narva Sealed Rocker Switch, part no. 63129BL, is a 12V SPST switch with off/momentary on action and contacts rated to 20A at 12V. It is supplied as an illuminated rocker switch with red lamp colouring and both “Dash Light” and “On” illumination functions.

This switch uses 5 terminals, push-on terminals, and a rocker-style actuator. The mounting opening is 37.5mm x 21mm, with a listed mount length of 37.5mm. Those dimensions matter if you are replacing an existing dash switch or planning a new panel fit-up where the opening size must be known before purchase.

Narva lists this unit as sealed, which is useful in applications where dust or moisture resistance is a consideration, but the switch still needs to be matched to the intended circuit. The electrical rating, terminal count, and switching action should all be checked against the job before installation, especially when the circuit is designed around 12V operation and 20A capacity.

Key Features

• 12V SPST sealed rocker switch
• Off / momentary on action
• 20A contact rating at 12V
• Red illuminated switch with “Dash Light” and “On” positions
• 5 terminals with push-on terminals
• 37.5mm x 21mm mounting opening

Specifications

• Brand: Narva
• Part No.: 63129BL
• Product type: Switch
• Switch type: Rocker
• Switch action: Off - Mom On - SPST
• Number of positions: 2
• Number of poles: 1
• Number of terminals: 5

Application and Buying Notes

Before ordering, confirm that your panel opening matches the stated 37.5mm x 21mm mounting opening. A rocker switch can look similar to others from the front, but the cut-out size and terminal layout are what determine whether it will actually fit and wire up correctly in the vehicle or accessory panel.

The electrical rating is also important. This switch is rated at 20A and for use at 12V only, so it should only be used where that voltage and current capacity suit the circuit. If the original switch or accessory load is different, compare the circuit requirements carefully rather than relying on the appearance of the switch alone.

The off/momentary on SPST action means it is not a standard latching on/off switch. That makes the operating behaviour just as important as the size and terminal count. If the existing setup requires a momentary function in one direction, this part may be suitable; if the circuit needs a different switching logic, the control function must be matched exactly.

Terminal style is another practical check. This unit has 5 terminals and push-on terminals, so you should verify that the wiring connectors and harness arrangement suit the switch before fitting. The red illumination with “Dash Light” and “On” lighting can also be useful where the switch needs to be visible in low light, but the lamp function should still be confirmed against the intended panel design.

The listed one-year warranty applies to the switch as supplied, but it does not replace checking the application first. A careful parts check using the part number 63129BL, the 12V rating, the 20A capacity, and the 37.5mm x 21mm cut-out size will reduce the risk of ordering the wrong component for the job.

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 63129BL 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 37.5mm, Number of Positions 2, Switch Illumination Illuminated, Product Group 2 FUSES BREAKERS RELAYS SWITCHES.

Additional published details for cross-checking include Part No. 63129BL, Brand NARVA, Description Narva Sealed Rocker Switch Off/Momentary On SPST 12V Red Illuminated (Contacts Rated 20A @ 12V), Number of Terminals 5, Switch Action Off - Mom On - SPST, Lamp Colour/s Red, Number of Poles 1, Switch Type Rocker, Weight 0.04kg, Product Group 1 AUTO ELEC ACCESSORIES.

Narva Sealed Rocker Switch Off/Momentary On SPST 12V Red Illuminated (Contacts Rated 20A @ 12V). Part number 63129BL 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 63129BL, 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.

In the absence of a verified fitment list, the safest approach is to compare the removed unit directly with the listed product details. That includes checking the housing style, pulley layout, regulator arrangement, and any visible identification numbers before supply is approved.

Compatibility note: Confirm compatibility by checking part number 63129BL, the off/momentary on SPST switching action, the 12V / 20A rating, and the 37.5mm x 21mm mounting opening against your existing switch and panel requirements before purchase.

FAQ

What is the part number for this Narva switch?

The part number is 63129BL.

Is this switch suitable for 12V systems?

Yes. It is listed as a 12V switch and is rated for use at 12V only.

What is the current rating?

The contacts are rated at 20A at 12V.

What is the switch action?

It is an off / momentary on SPST switch.

What size mounting opening does it need?

The mounting opening is 37.5mm x 21mm.

How many terminals does it have?

It has 5 terminals with push-on terminals.