Battery Fuse Box Mercedes W204 Control Unit Module SAM A2075400340

The Mercedes W204 Battery Fuse Box Module (Battery Fuse Box / SAM module) is a specialized component of the power supply system, responsible for safely distributing current and protecting the vehicle's main electrical circuits. Thanks to its factory design for the Mercedes W204 platform, it ensures stable operation of the electrical system and proper protection of critical consumers. This is a solution for users who expect a reliable and original-equivalent component for their car's electrical system.

Specifications and technical data

• SKU: rhd-A2075400340-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2075400340
• Substitutable numbers: A2075400340, A 207 540 03 40, A2075400740, A 207 540 07 40, EM
• Category: Fuses & Fuse Boxes

Purpose and Function in the Vehicle

The presented battery fuse box module serves as the central power distribution point in the battery compartment, cooperating with the Mercedes W204 electrical system. As a component integrated with the SAM control function, it is responsible for logical circuit management, protection control, and rapid power disconnection in case of overloads or short circuits.

This solution allows for:

• organized routing of main power lines in the vehicle,
• protection of key consumers through appropriately selected fuses,
• consistent operation with the factory electrical architecture of Mercedes.

Construction and Technical Advantages

The module is designed as a component from the Fuses and Fuse Boxes group, with a dedicated layout of current paths and fuse sockets adapted to the requirements of Mercedes W204 models. The construction features clearly separated power sections, which facilitates diagnostics and servicing in case of individual circuit failures.

Key technical advantages include:

• factory fit for Mercedes electrical systems,
• integration of protection and control functions in a single module,
• possibility of using available replacement part numbers to match specific equipment versions.

Benefits of Using an Original Mercedes Module

Using an original battery fuse box module in a Mercedes W204 maintains consistency with factory service documentation and electrical diagrams. This simplifies diagnostics of potential faults and ensures predictable cooperation with other control units in the vehicle.

In practice, this means:

• reduced risk of communication problems between control modules,
• proper operation of current protection in critical circuits,
• easier integration with the existing wiring harness without modifications.

Condition, Fitment, and Service Application

This part is from the used parts category, allowing for economical repair of the electrical system while maintaining the original manufacturer's specifications. The module is particularly useful in situations where the fuse box in the battery area has been damaged, current paths have overheated, or there are issues with power distribution in the vehicle.

Before installation, it is recommended to verify compatibility with the specific equipment version and compare the part number and replacement numbers with the old module to ensure proper fitment for the given Mercedes W204 model.

Expanding the Protection System in Mercedes

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

For drivers interested in broader use of second-hand parts – for both repairs and modifications – practical tips on selecting used components, verifying them, and safe installation may be useful. You can find more on this topic in the article Audi on second-hand parts – tuning and repairs without quality loss, which shows how to wisely use the automotive aftermarket.