Hella Door Light Switch On Mom Off Spst 2A 12V Part No. 4550

The Hella Door Light Switch is a single-pole, single-throw switch with an Off - Mom On - SPST action and contacts rated at 2A on 12V systems. It is supplied as a single unit and carries Part No. 4550, which is the key identifier to check against your application before ordering.

This switch is designed as a door light switch and closes the circuit when the door is opened. The listed opening requirement is 21 mm diameter, so the physical mounting size is a practical check point as well as the electrical rating of 2A @ 12V and 1A @ 24V.

The unit is non-illuminated, has one terminal, and is described as 1 pole with 2 positions. For buyers replacing an existing door-operated interior light switch or selecting a simple circuit control, those details matter as much as the brand name and Part No. 4550.

HELLA lists this switch within auto electrical accessories and backs it with a three-year warranty. For workshop use or a tidy repair, that gives you a compact, clearly specified switch rather than a generic universal part with uncertain ratings.

Key Features

• Door light switch with SPST action
• Closes circuit when door is opened
• 21 mm diameter opening
• 2A @ 12V, 1A @ 24V
• One terminal, non-illuminated
• Part No. 4550

Specifications

• Brand: HELLA
• Product type: Switch
• Switch type: Door Light
• Switch action: Off - Mom On - SPST
• Number of poles: 1
• Number of positions: 2
• Power rating: 2A
• Voltage: 12V

Application and Buying Notes

Before ordering, confirm that your vehicle or project uses a door light switch with the same Part No. 4550, a 21 mm diameter opening, and a one-terminal layout. Those three checkpoints are the most useful starting points when matching an existing switch rather than choosing by appearance alone.

The electrical rating is straightforward: 2A at 12V and 1A at 24V. That means the switch is intended for light-duty control applications, which suits a door-operated lamp circuit, but it should still be checked against the current draw of the circuit you are servicing.

The switch action is listed as Off - Mom On - SPST. If you are replacing a failed part, compare the old switch’s terminal count, mounting size, and operating action before installation. A close visual match is not enough if the electrical action or mounting opening is different.

Because this unit is non-illuminated, it will not provide a built-in light or indicator in the switch body. That is worth checking if your original switch had any illumination function or if the dash or door trim arrangement relies on a specific style of switch face.

HELLA’s three-year warranty is a useful commercial detail, but it does not replace fitment checking. Use the part number, the 21 mm opening, and the stated voltage and amperage limits together to judge whether the part suits your application.

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 4550 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, Number of Poles 1, Switch Type Door Light, Product Group 2 FUSES BREAKERS RELAYS SWITCHES, Part No. 4550.

Additional published details for cross-checking include Brand HELLA, Description Hella Door Light Switch On Mom Off SPST (Contacts Rated 2A @ 12V), Number of Terminals 1, Switch Action Off - Mom On - SPST, Lamp Colour/s Not Applicable, Number of Positions 2, Switch Illumination Non Illuminated, Product Group 1 AUTO ELEC ACCESSORIES.

Hella Door Light Switch On Mom Off SPST (Contacts Rated 2A @ 12V). Part number 4550 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 4550, 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.

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: Please confirm compatibility with Part No. 4550, the 21 mm diameter opening, the one-terminal layout, and the stated 2A @ 12V / 1A @ 24V ratings before purchase. If the original switch differs in any of those details, check the application carefully before fitting.

FAQ

What is the part number for this Hella door light switch?

The listed Part No. is 4550. That is the main identifier to compare with your existing switch or parts record.

What electrical rating does the switch have?

It is rated at 2A on 12V systems and 1A on 24V systems.

How does the switch operate?

The switch action is listed as Off - Mom On - SPST, and it closes the circuit when the door is opened.

How many terminals does it have?

It has one terminal.

Is the switch illuminated?

No. The specification lists switch illumination as non illuminated.

What should I check before buying?

Confirm the Part No. 4550, the 21 mm diameter opening, the one-terminal layout, and the 2A @ 12V / 1A @ 24V ratings against your existing part or application.