Mercedes W163 W168 W203 W211 Relay Unit 4-Pin Black Set X2 A0025421119

Description

Mercedes W163 W168 W203 W211 Relay Unit 4-Pin Black Set X2 is a set of two black relays designed for selected Mercedes W163, W168, W203, and W211 class models. The set provides a practical service solution, allowing for the efficient replacement of components responsible for the stable control of selected electrical circuits. By maintaining factory operating characteristics, the relays ensure consistency of the electrical system’s operation and predictable response of onboard systems.

Specifications and technical data

• SKU: A0025421119-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025421119
• Substitutable numbers: A0025421119, A 002 542 11 19, EM
• Color: Black
• Category: Relays

Purpose and function in the electrical system

The offered set of relays from the Relays category has been designed to work with the electrical systems of Mercedes W163, W168, W203, and W211 series cars. The four-pin design allows for the control of selected medium-load circuits, typically used in comfort systems, auxiliary power supply, or auxiliary module control.

The relays act as an electrical switch that:

• separates the control circuit from the power circuit,
• reduces the load on mechanical switches and control modules,
• stabilizes the operation of selected electrical devices in the vehicle.

Construction and functional features

Each element in the set is a compact, black four-pin relay, adapted for installation in factory Mercedes electrical sockets. The black housing facilitates visual matching with original wiring harnesses and fuse boxes, while also protecting the interior of the relay from external factors typical of the engine compartment or the space under the dashboard.

Key design advantages:

• four-pin layout ensuring compatibility with factory sockets,
• black housing, promoting aesthetic installation,
• set of two pieces, which allows for the simultaneous replacement of a pair of relays or keeping one as a spare.

Compatibility with Mercedes models

The relay set is intended for selected electrical configurations in Mercedes models designated as W163, W168, W203, and W211. Using an original solution from the same product group allows for maintaining consistency of electrical parameters and predictable operation of the systems controlled by these relays.

Before installation, it is recommended to verify compatibility with the specific vehicle equipment version to match the relays to the actual wiring diagram used.

Condition and service application

The offered set comes from the secondary market, which makes it an attractive solution in situations where the priority is an economical repair while maintaining the original operating characteristics of the system. These types of relays are particularly useful in:

• electrical system repairs after a single circuit failure,
• preventive replacement of components with similar operational mileage,
• restoring the factory configuration after previous modifications.

Benefits of using an original Mercedes relay

Using relays matched to a specific Mercedes model series reduces the risk of electrical system malfunctions and eliminates problems resulting from the use of random replacements. Consistent circuit switching characteristics promote stable operation of control modules, and the properly selected housing and pin layout facilitate installation without interfering with the wiring harness.

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 additional relays, control modules, or protection elements, check the available parts in the Mercedes Relays category.

Summary

Mercedes W163 W168 W203 W211 Relay Unit 4-Pin Black Set X2 is a practical set of two black four-pin relays designed for selected Mercedes models. The product allows for the efficient replacement of worn-out electrical circuit control components while maintaining the factory operating characteristics of the system. This solution is particularly useful in service centers specializing in the Mercedes brand and for users who want to restore the proper operation of electrical systems without interfering with the original wiring harness.