Mercedes W169 W245 W204 W212 Relay 4-Pin Black Hella A0025427219

Mercedes W169 W245 W204 W212 Relay 4-Pin Black Hella is an original component from the Relays category, designed for use in popular Mercedes compact and mid-size models. This used relay from the renowned manufacturer Hella ensures stable operation of electrical systems, while its compact, black housing facilitates installation within the factory wiring harness.

Specifications and technical data

• SKU: A0025427219
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025427219
• Substitutable numbers: A0025427219, A 002 542 72 19, 4RA007791, 4RD007 791
• Color: Black
• Category: Relays

Purpose and function of the relay

The described relay is a control component in the electrical system of Mercedes W169, W245, W204, and W212 series vehicles. Thanks to its four-pin design, it acts as a reliable link between the control circuit and the powered load, which helps relieve the load on more delicate electronic components and ensures safe switching of higher currents.

This type of solution is used, among other things, to power selected electrical components where operational repeatability, resistance to voltage fluctuations, and proper cooperation with the factory control module are required.

Design and technical features

The Hella relay in a black housing has been designed for operation in the engine compartment or inside the vehicle, depending on the specific model configuration. The four pins ensure clear signal and power routing, and the standard pin layout facilitates correct seating in the socket without the need for installation modifications.

Key design advantages include:

• a compact, black housing that facilitates integration with the factory wiring,
• a four-pin contact layout matched to original Mercedes sockets,
• the use of solutions typical for OEM relays, which promotes stable system operation.

Benefits of using an original relay

Using an original Hella relay in Mercedes cars allows for maintaining the consistency of electrical parameters with the factory installation design. This reduces the risk of component malfunction, interference in control module operation, and diagnostic issues.

By choosing this item from the Relays category, you gain:

• compatibility with factory wiring and sockets in W169, W245, W204, and W212 models,
• consistency of electrical characteristics with the vehicle manufacturer's specifications,
• the ability to restore proper system operation after the failure of the previous relay.

Condition and service application

The item comes from disassembly and is intended for reinstallation in Mercedes vehicles where restoring the functionality of a specific electrical circuit is required. A used OEM relay is a solution often chosen in professional workshops when availability, installation compatibility, and repair cost control are important.

If you are planning a comprehensive repair or upgrade of the electrical system area in your Mercedes and need other components from the same group, such as control relays, power relays, or switching modules, check the available parts in the Mercedes Relays category.

Selection support and repair time

Selecting the right relay has a direct impact on the vehicle's downtime in the workshop and the durability of the repair performed. Used OEM components, such as this Hella relay, often allow for shortening the waiting time for parts and maintaining high compliance with the vehicle's factory specifications.

To better understand how the availability of used original components affects workshop workflow and service costs, it is worth reading the article Immediate availability of car parts vs. repair time – how used OEM parts shorten workshop stays?.