Relay Mercedes E200 S124 Petrol M111 Overload Protection Relay A2015403245

Relay Mercedes E200 S124 Petrol M111 Overload Protection Relay is a specialized electrical system component responsible for monitoring loads and protecting critical circuits in this series of vehicles. Thanks to its precise operating characteristics and compatibility with the petrol engine unit, the relay ensures stable power supply and reduces the risk of electrical system damage. It is a practical solution for users who want to restore proper electronic functionality without interfering with the vehicle's factory architecture.

Specifications and technical data

• SKU: A2015403245
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2015403245
• Substitutable numbers: A2015403245, A 201 540 32 45, 897162, 89 71 62
• Fuel type: Petrol
• Category: Relays

Purpose and function of the overload protection relay

The described overload protection relay is designed for the Mercedes E200 S124 model with an M111 engine powered by Petrol, where it is responsible for monitoring selected electrical circuits. Its task is to disconnect the power supply in the event of an excessive load, which protects the installation components from overheating, short circuits, and secondary damage to electronic components.

In practice, a properly functioning overload protection relay contributes to:

• stability of the petrol engine control systems,
• safe power supply for components sensitive to voltage spikes,
• reducing the risk of failures resulting from electrical overloads.

Compatibility and identification parameters

The product belongs to the Relays category and is a component dedicated to Mercedes vehicles, which facilitates part selection based on the manufacturer's factory standards. Appropriate markings, including the OEM part number and available replacement numbers, allow for unambiguous identification of the relay in service catalogs and part selection systems, without the need for electrical system modifications.

As a result, the relay can be used as a direct replacement for the factory-installed component, maintaining the original operating parameters of the system and compliance with the vehicle's technical documentation.

Operational characteristics and installation

The overload protection relay in this version is a used part, which in practice means the possibility of an economical repair while maintaining the manufacturer's original specifications. The component is intended for installation in the existing wiring harness, in the location provided by the design of the Mercedes E200 S124, without the need for system modifications.

The main advantages of using this relay include:

• maintaining the factory logic of electrical system protections,
• compatibility with the operating parameters of the M111 petrol engine,
• the ability to restore proper circuit operation after the failure of the previous component.

Application in the petrol power system

In petrol-powered vehicles such as the Mercedes E200 S124, voltage stability and load control have a direct impact on the engine's performance and the service life of electronic components. The overload protection relay works with the engine control system, ensuring appropriate power supply conditions for sensors, modules, and other elements requiring protection against overload.

Selecting a relay that meets the manufacturer's requirements is particularly important in vehicles equipped with extensive control electronics, where improper protection can lead to difficult-to-diagnose faults.

System expansion and related parts

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 main relays, fuel pump relays, or protection modules, check the available parts in the Mercedes Relays category.

For drivers interested in a broader understanding of vehicle component operation and the impact of electronics on driving, the article describing the construction and diagnostics of the steering and power steering system may be helpful – you can find it here: Steering and power steering – how it works and what breaks?.