Hella Toggle Switch On/off Spst 20A 12V Part No. 4451

The HELLA Toggle Switch On/Off SPST is a 2-position switch with contacts rated at 20A @ 12V and 10A @ 24V. It suits applications that call for a simple on/off control in a 12mm mounting hole, with a panel thickness limit of up to 5mm.

This switch is non-illuminated and uses 2 terminals, which keeps the wiring straightforward for basic switching circuits. The listed part number is 4451, and the unit is supplied as a single switch, sold each.

With a mount length of 5mm and a 12mm diameter opening, this HELLA toggle switch is sized for panels where you want a compact control point rather than a larger panel-mounted control. The specification set is clear and specific, which helps when matching it to an existing opening or planned installation.

Key Features

• On/off SPST toggle switch
• 20A rated at 12V
• 10A rated at 24V
• 12mm diameter mounting opening
• Suitable for panels up to 5mm thick
• Non-illuminated

Specifications

• Brand: HELLA
• Part No.: 4451
• Product type: Switch
• Switch action: On - Off - SPST
• Switch type: Toggle
• Number of poles: 1
• Number of positions: 2
• Number of terminals: 2

Application and Buying Notes

Before ordering, check that your panel has a 12mm diameter opening available, or space to drill one, and that the panel thickness does not exceed 5mm. Those two measurements are the key physical checkpoints for this HELLA toggle switch, alongside the part number 4451 if you are replacing an existing unit.

The electrical rating matters as much as the physical size. This switch is rated at 20A @ 12V and 10A @ 24V, so it should only be used where the circuit load sits within those limits. It is a 1-pole, 2-position SPST on/off switch with 2 terminals, which suits basic single-circuit switching rather than more complex control functions.

Because the switch is non-illuminated, it does not provide a lighted indicator in the knob or body. If you are replacing a switch in a dash, console, marine panel, or accessory control panel, compare the existing hole size, mounting depth, terminal count, and switching action before purchase. The 5mm mount length and 12mm opening are the most useful physical checks for a clean replacement.

If you are matching an existing setup, confirm the original switch’s function is on/off SPST and not a different pole or position arrangement. The part number 4451 is the best reference to cross-check against the switch you are removing, but the final check should always be the actual mounting size and electrical requirement in the vehicle or equipment circuit.

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 4451 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 Three Years, Power Rating (Amp) 20, Voltage 12, Mount Diameter 12mm, Number of Poles 1, Switch Type Toggle, Product Group 2 FUSES BREAKERS RELAYS SWITCHES.

Additional published details for cross-checking include Part No. 4451, Brand HELLA, Description Hella Toggle Switch On/Off SPST (Contacts Rated 20A @ 12V), Number of Terminals 2, Switch Action On - Off - SPST, Lamp Colour/s Not Applicable, Mount Length 5mm, Number of Positions 2, Switch Illumination Non Illuminated, Product Group 1 AUTO ELEC ACCESSORIES.

Hella Toggle Switch On/Off SPST (Contacts Rated 20A @ 12V). Part number 4451 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 4451, 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 compatibility by checking the existing switch part number, the 12mm mounting opening, the 5mm maximum panel thickness, and the on/off SPST function before ordering.

FAQ

What type of switch is this?

It is a HELLA toggle switch with an On - Off - SPST action, using 1 pole, 2 positions, and 2 terminals. For this listing, part number 4451 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 electrical rating?

The switch is rated at 20A @ 12V and 10A @ 24V. For this listing, part number 4451 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 size hole does it need?

It requires a 12mm diameter mounting opening. For this listing, part number 4451 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.

Will it suit any panel thickness?

No. It is listed for panels up to 5mm thick. For this listing, part number 4451 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.

Is the switch illuminated?

No. It is specified as non-illuminated. For this listing, part number 4451 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 part number?

The listed part number is 4451. For this listing, part number 4451 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.