Fuse Box Mercedes W213 C238 C257 Front Relay Module Control Unit A2135404139

Fuse Box Mercedes W213 C238 C257 Front Relay Module Control Unit is a specialized component from the Fuses and fuse boxes group, designed for installation in the front part of the vehicle. The module is responsible for organized power distribution and the protection of key electrical circuits, which directly impacts the stable operation of the electrical system in modern premium-class cars.

Specifications and technical data

• SKU: rhd-A2135404139
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2135404139
• Substitutable numbers: A2135404139, A 213 540 41 39
• Location on the vehicle: Front
• Category: Fuses & Fuse Boxes

Purpose and function of the module

The described fuse box is designed as a central point for electrical protection in the front section of the vehicle. It consolidates fuse sockets and wiring connectors into a single, compact housing, which facilitates service and diagnostics. Thanks to this solution, it is possible to quickly locate circuits responsible for the operation of systems such as lighting, electronic control units, or selected comfort systems.

Its placement in the front area promotes easier service access while allowing for the logical routing of electrical harnesses. For workshops, this means shorter working times during replacement or inspection, and for the user – more predictable electrical system behavior.

Construction and functional advantages

The fuse box module is constructed as a compact, durable unit adapted for operation in the vehicle's front compartment. The arrangement of sockets and connectors follows the factory logic, which facilitates correct harness connection and minimizes the risk of assembly errors.

• organized architecture of fuse sockets and installation connectors,
• design adapted for operation in the front zone of the vehicle,
• solution compliant with the factory wiring concept.

Thanks to this construction, the module supports the stability of power supply to individual receivers while allowing for the quick replacement of individual fuses without interfering with the rest of the installation. This is a practical solution for both private users and professional service centers.

Condition, fitment, and service application

The offered item is a used part, which in practice means an attractive cost-to-functionality ratio while maintaining the original design. For vehicles where the fuse box has been damaged due to overload, flooding, or collision, such a replacement is often the fastest and most cost-effective way to restore the proper operation of the electrical system.

In service applications, the module will prove useful both for standard repairs and for more extensive work related to rebuilding the front of the vehicle. Maintaining the factory connection architecture facilitates subsequent computer diagnostics and reduces the risk of errors resulting from incorrect wiring.

Benefits of installation in premium-class vehicles

In modern premium-class cars, such as the W213, C238, and C257 models, extensive electronics require a stable, well-designed power distribution center. The use of a properly selected fuse box translates into:

• more predictable operation of comfort and safety systems,
• easier diagnostics of electrical faults,
• an organized installation structure that promotes long-term operation.

For the vehicle owner, this means a lower risk of unplanned downtime and more efficient service maintenance. For the workshop – the ability to quickly restore full functionality of electrical systems without the need to rebuild harnesses.

Expanding the scope of service work

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other components from the same group, such as additional protection modules, power distribution boxes, or auxiliary fuse blocks, check the available parts in the Mercedes Fuses and fuse boxes category.

For a better understanding of the relationships between power supply, control units, and other electrical components in the vehicle, you may also find the guide on the fuel system, selecting components by identification numbers, and diagnostic principles helpful – you will find it in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.