Hella Door Light Switch Off Mom On Spst 2A 12V Part No. 4551

The HELLA Door Light Switch is a two-position switch with an On - Mom Off - SPST action, rated at 2A and 12V, with a 21mm mounting diameter. It is a non-illuminated switch with 2 terminals and 1 pole, supplied as each, and identified by Part No. 4551.

This switch is described as a door light switch and is designed for straightforward control duties where a compact 21mm diameter opening is available. The listed maximum load is 12V@2A or 24V@1A, so it should only be used within those electrical limits.

For buyers comparing options, the main identifiers are the HELLA brand, Part No. 4551, the 2-position On - Mom Off - SPST configuration, and the 21mm mount diameter. Those details matter more than appearance alone, especially when replacing an existing switch or matching a panel opening.

Key Features

• HELLA door light switch
• On - Mom Off - SPST action
• 2 positions
• 2 terminals
• Non illuminated
• 21mm mounting diameter opening

Specifications

• Brand: HELLA
• Part No.: 4551
• Product type: Switch
• Switch type: Door Light
• Switch action: On - Mom Off - SPST
• Number of poles: 1
• Number of terminals: 2
• Power rating: 2A

Application and Buying Notes

Before ordering, confirm the existing panel opening and wiring arrangement against the key dimensions and electrical ratings: 21mm mount diameter, 2 terminals, 1 pole, and a 12V 2A rating. Those are the most useful checkpoints when matching a replacement door light switch.

The switch action is listed as On - Mom Off - SPST, so it is intended for a simple single-pole switching function rather than a multi-circuit application. If your original switch uses a different action, terminal count, or pole arrangement, this part may not be suitable even if the physical opening appears close.

The maximum load is stated as 12V@2A or 24V@1A, so the connected circuit must stay within those limits. For replacement work, compare the old switch body, mounting hole, and terminal layout carefully before fitting, especially where the original part is worn, unlabelled, or has been modified.

As a door light switch, this part is listed as non illuminated and does not use a lamp colour specification. If your existing switch relies on illumination, or if the panel needs a lit indicator, this unit will not match that requirement.

The most reliable buying check is the part number. HELLA Part No. 4551 gives you a clear reference point to compare against the old switch or any workshop records. If you are unsure, measure the opening and verify the terminal arrangement before purchase rather than relying on the general shape alone.

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 4551 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) 2, Voltage 12, Mount Diameter 21mm, Number of Positions 2, Switch Illumination Non Illuminated, Product Group 1 AUTO ELEC ACCESSORIES, Part No. 4551.

Additional published details for cross-checking include Brand HELLA, Description Hella Door Light Switch Off Mom On SPST (Contacts Rated 2A @ 12V), Number of Terminals 2, Switch Action On - Mom Off - SPST, Lamp Colour/s Not Applicable, Number of Poles 1, Switch Type Door Light, Product Group 2 FUSES BREAKERS RELAYS SWITCHES.

Hella Door Light Switch Off Mom On SPST (Contacts Rated 2A @ 12V). Part number 4551 should be checked first. Listed voltage is 12. Listed output rating is 2. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 4551, 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 2 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment by matching HELLA Part No. 4551, the 21mm mounting diameter, and the 2-terminal On - Mom Off - SPST configuration to your existing switch before ordering.

FAQ

What is the part number for this HELLA switch?

The listed part number is 4551. For this listing, part number 4551 is the main reference point. Listed voltage is 12. Listed output rating is 2. These details should still be checked against the original unit before ordering.

What is the mounting size?

The switch requires a 21mm diameter opening. For this listing, part number 4551 is the main reference point. Listed voltage is 12. Listed output rating is 2. These details should still be checked against the original unit before ordering.

How many terminals does it have?

It has 2 terminals. For this listing, part number 4551 is the main reference point. Listed voltage is 12. Listed output rating is 2. These details should still be checked against the original unit before ordering.

Is the switch illuminated?

No. The switch is listed as non illuminated. For this listing, part number 4551 is the main reference point. Listed voltage is 12. Listed output rating is 2. These details should still be checked against the original unit before ordering.

What are the electrical ratings?

The listed power rating is 2A at 12V, and the maximum load is 12V@2A or 24V@1A. For this listing, part number 4551 is the main reference point. Listed voltage is 12. Listed output rating is 2. These details should still be checked against the original unit before ordering.

What type of switch action does it use?

It is listed as On - Mom Off - SPST, with 2 positions and 1 pole. For this listing, part number 4551 is the main reference point. Listed voltage is 12. Listed output rating is 2. These details should still be checked against the original unit before ordering.