Genuine OEM Mercedes-Benz Ignition Starter Switch, part number A2025450104. This switch is a critical component that activates the vehicle's ignition system and engages the starter motor when the key is turned. It ensures the correct electrical sequences for starting the engine. The switch's internal contacts and mechanism are designed for reliable operation over many cycles. Genuine OEM ignition switches provide the precise electrical characteristics and durability needed for safe and dependable starting.