Relay Unit Mercedes W163 W168 W203 W211 4-Pin Black Hella A0025421119 Set 2x

Mercedes W163 W203 4-Pin Black Hella Relay A0025421119 Set of 2x is a factory electrical system component designed for use in Mercedes W163 and W203 class vehicles. The set includes two relays, allowing for efficient replacement of components controlling selected electrical circuits and maintaining stable system operation. By using a component from a renowned manufacturer, high compatibility with the vehicle's factory architecture and predictable operating parameters are ensured.

Specifications and technical data

• SKU: A0025421119-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025421119
• Substitutable numbers: A0025421119, A 002 542 11 19
• Color: Black
• Category: Relays

Technical Characteristics and Application

The presented relay is a component from the Relays group, equipped with four connection pins, enabling the implementation of typical switching functions in the vehicle's low-voltage system. The design based on a standard contact arrangement allows the relay to be used in various auxiliary circuits, such as powering selected modules, controlling receivers, or separating control circuits from executive circuits.

The black housing provides a neutral, factory appearance and facilitates integration with the existing wiring harness and fuse box sockets. Using a component compatible with solutions used in Mercedes series W163 and W203 promotes correct current characteristics and proper cooperation with factory control modules.

Compatibility and Vehicle System Compliance

The relay has been designed for operation in Mercedes vehicle electrical systems, which translates to appropriate dimensional and electrical matching to mounting sockets. The use of an original solution helps to reduce the risk of problems with excessive contact heating, voltage drops, or unstable receiver operation.

The presence of a dedicated part number and associated interchangeable numbers facilitates the selection of the correct component based on service documentation or manufacturer catalogs. This allows the relay to be used as a direct replacement for a factory-installed component, without the need for system modifications or wiring harness interference.

Construction, Color Scheme, and Service Ergonomics

The Black relay housing is resistant to typical operating conditions in the engine bay or the vehicle's fuse box, where temperature changes and increased humidity occur. The four executive pins are arranged in accordance with the factory standard, which facilitates quick insertion into the socket and minimizes the risk of incorrect installation.

The set, including two units, allows for simultaneous replacement of a pair of relays operating in critical circuits or for keeping one as a spare service component. This approach increases the operational reliability of the vehicle and reduces the time for potential future repairs.

Condition, Origin, and Benefits of Use

The offered set is a used part, allowing for economical restoration of the electrical system's functionality while maintaining compatibility with factory solutions. Choosing an original relay from disassembly is often preferred over cheap aftermarket replacements of unknown origin, especially in vehicles where the stability of control module power supply is crucial.

When expanding or repairing the electrical system, it is also worth considering other components from the control group, available in the relays for Mercedes vehicles section, which facilitates a comprehensive approach to servicing. Additional information on selecting and the role of electrical parts in modern cars can be found in our guide on the operation and diagnostics of electrical systems in premium class cars, which helps to consciously plan repairs and upgrades.