Narva Heavy Duty Rocker Switch Off/on Spst 20A 12V Part No. 63040BL

The Narva Heavy Duty Rocker Switch Off/On is a 2-position SPST switch with contacts rated at 20A at 12V and 10A at 24V. It is a non-illuminated rocker switch with 2 terminals, push on connections, and Part No. 63040BL.

With a mounting opening of 37.5mm x 21mm, this switch suits installations where a compact rectangular panel cut-out is required. The unit is listed as 12V, with a power rating of 25A and a stated switch action of On - Off - SPST.

Narva identifies this as a heavy duty rocker switch in the Fuses, Breakers, Relays, Switches product group. It is supplied as each, weighs 0.025kg, and carries a one year warranty.

Key Features

• Heavy duty rocker switch
• On / Off, SPST action
• 20A at 12V, 10A at 24V contacts
• Non-illuminated design
• Push on terminals
• 2 terminals, 1 pole

Specifications

• Brand: Narva
• Part No.: 63040BL
• Product type: Switch
• Switch type: Rocker
• Switch action: On - Off - SPST
• Number of positions: 2
• Voltage: 12V
• Power rating: 25A

Application and Buying Notes

Before ordering, check the panel cut-out against the listed mounting opening of 37.5mm x 21mm. That measurement is the key physical check for this Narva rocker switch, because a mismatch at the aperture will stop the switch from seating correctly even if the wiring is suitable.

Confirm that your circuit suits an On - Off SPST switch with 2 terminals and push on connections. The contact rating is 20A at 12V and 10A at 24V, so the electrical load and system voltage need to match the way the switch will be used.

If your setup relies on illumination, this unit is not the right choice because it is listed as non illuminated and lamp colour is not applicable. That makes it a straightforward switching item rather than a lighted control option.

The part number is 63040BL, and that identifier is the most reliable reference when matching the switch to a replacement requirement. When replacing an existing switch, compare the part number, terminal count, action, voltage, and cut-out size before purchase.

This is sold as each, so quantity should be chosen to suit the number of switches needed for the job. At 0.025kg, it is a light component, but the important checks remain the electrical rating, terminal style, and panel opening rather than weight.

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 63040BL 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) 25, Voltage 12, Mount Length 3mm, Number of Positions 2, Switch Illumination Non Illuminated, Product Group 2 FUSES BREAKERS RELAYS SWITCHES.

Additional published details for cross-checking include Part No. 63040BL, Brand NARVA, Description Narva Heavy Duty Rocker Switch Off/On SPST (Contacts Rated 20A @ 12V), Number of Terminals 2, Switch Action On - Off - SPST, Lamp Colour/s Not Applicable, Number of Poles 1, Switch Type Rocker, Weight 0.025kg, Product Group 1 AUTO ELEC ACCESSORIES.

Narva Heavy Duty Rocker Switch Off/On SPST (Contacts Rated 20A @ 12V). Part number 63040BL should be checked first. Listed voltage is 12. Listed output rating is 25. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 63040BL, 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 25 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Please confirm compatibility using Part No. 63040BL, the 37.5mm x 21mm mounting opening, the 2-terminal SPST On - Off action, and the 12V / 20A contact rating before ordering.

FAQ

Is this switch illuminated?

No. It is listed as non illuminated, and lamp colour is not applicable. For this listing, part number 63040BL is the main reference point. Listed voltage is 12. Listed output rating is 25. These details should still be checked against the original unit before ordering.

How many terminals does it have?

It has 2 terminals and is listed as a 1 pole SPST switch. For this listing, part number 63040BL is the main reference point. Listed voltage is 12. Listed output rating is 25. These details should still be checked against the original unit before ordering.

What is the mounting cut-out size?

The mounting opening is 37.5mm x 21mm. For this listing, part number 63040BL is the main reference point. Listed voltage is 12. Listed output rating is 25. These details should still be checked against the original unit before ordering.

What is the electrical rating?

The contact rating is 20A at 12V and 10A at 24V. The product also lists a power rating of 25A and a voltage of 12V. For this listing, part number 63040BL is the main reference point. Listed voltage is 12. Listed output rating is 25. These details should still be checked against the original unit before ordering.

What is the switch action?

It is an On - Off - SPST rocker switch with 2 positions. For this listing, part number 63040BL is the main reference point. Listed voltage is 12. Listed output rating is 25. These details should still be checked against the original unit before ordering.

What part number should I use to match it?

The part number is 63040BL. Matching that number, along with the terminal count, action, voltage, and mounting opening, is the safest way to confirm suitability. For this listing, part number 63040BL is the main reference point. Listed voltage is 12. Listed output rating is 25. These details should still be checked against the original unit before ordering.