What is the Volkswagen Lavida 648 relay?

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Volkswagen Lavida relay number 648 is the main relay, whose primary function is to control instrument power supply. Below is relevant information about the relay: 1. Basic components of a relay: Automotive relays consist of a magnetic circuit system, contact system, and reset mechanism. The magnetic circuit system is composed of components such as the iron core, yoke, armature, and coil. The contact system includes parts like stationary spring leaves, moving spring leaves, and contact bases. 2. Classification of relays: Current-controlled relays operate based on specific current values and form practical circuits with other components. For example, the flasher relay in vehicles - the higher the current, the faster the flashing frequency. Voltage-controlled relays activate at specific voltage thresholds, either connecting or disconnecting controlled circuits when the circuit voltage exceeds or falls below certain values. Examples include lighting relays and horn relays. Voltage relays are primarily used to control high-current consumption circuits. Typically, the coil control voltage of such relays requires more than 7V to operate and stops working when below 5V.