Relay Mercedes W203 W204 W212 W639 W906 4-Pin Grey Hella 12V A0025422619

Relay Mercedes W203 W204 W212 W639 W906 4-Pin Grey Hella 12V is an original component from the Relays group, designed for use in selected Mercedes models. The grey, 4-pin relay by Hella ensures stable control of electrical circuits, supporting the proper operation of the vehicle's comfort systems and electrical installation. This used OEM component is a sensible choice for maintenance when you want to maintain factory operating parameters.

Specifications and technical data

• SKU: A0025422619-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025422619
• Substitutable numbers: A0025422619, A 002 542 26 19
• Color: Grey
• Category: Relays

Technical characteristics and application

The presented Hella relay is a 4-pin component housed in a compact, grey casing, which facilitates identification in the fuse and module box. The design, based on a standard pin layout, allows for reliable switching of circuits with varying loads, in accordance with the vehicle manufacturer's factory specifications.

The relay is intended for installation in Mercedes cars from the W203, W204, W212, W639, and W906 series, where it is responsible for controlling selected electrical consumers. Using an original component helps maintain the consistency of electrical parameters and reduces the risk of problems resulting from the use of replacements with uncertain specifications.

Construction and performance properties

The grey relay housing is made of durable plastic, resistant to the typical conditions found in a vehicle's electrical installation compartments. The standard 4-pin terminals ensure secure seating in the socket and proper electrical contact with the vehicle's wiring harness.

Thanks to the factory design tailored to specific Mercedes models, the relay works with the existing electrical architecture without the need for modifications. Proper fitment to the installation reduces voltage drops, contact overheating, and accidental circuit disconnections, which is particularly important in systems responsible for safety and driving comfort.

Benefits of using an original Mercedes relay

Choosing an original relay instead of an unverified replacement is an investment in the predictable operation of the electrical system. Factory-matched parameters minimize the risk of incorrect circuit switching, flickering of electrical consumers, or random errors in onboard systems.

• Compatibility with the electrical installation of selected Mercedes models.
• Stable operation under typical vehicle operating conditions.
• Reduction of failure risks resulting from inappropriate relay characteristics.
• Easy installation thanks to the standard 4-pin layout.

The used OEM component allows for economical repair while maintaining the design intended by the vehicle manufacturer, which is especially important in the case of complex electrical systems in modern Mercedes vehicles.

Installation and operation in Mercedes vehicles

The relay is designed for installation in factory relay and fuse box sockets in the Mercedes models mentioned in the title. In practice, the replacement involves removing the old component and seating the new one in the same socket, maintaining the correct pin orientation. No need for wiring modifications speeds up service and reduces the risk of installation errors.

When working with the electrical system, standard safety procedures are recommended: disconnecting the power supply, checking the condition of the socket, and verifying the correct operation of the circuit after replacement. Thanks to the use of an original relay, it is possible to quickly restore the efficiency of systems that previously showed signs of unstable operation.

Service expansion and technical knowledge

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other elements from the same group, such as additional relays, control modules, or circuit protection elements, check out the available parts in the Mercedes Relays category.

For those interested in a broader context of the development of electrical and electronic solutions in cars of this brand, the article describing successive generations of flagship models, their equipment, and the selection of service components may be helpful: Evolution of the Mercedes S-Class: from W140 to W222 – innovations and Mercedes parts in service practice.