Automotive relay coils are crucial components in vehicle electrical systems, enabling the switching of circuits that control various electrical components like lights, air conditioning, and engine functions. These electromagnetic devices allow the control of high-current circuits by using low-power control signals. In this article, we will explore the key specifications of automotive relay coils, providing an in-depth understanding of their operation and importance in the automotive industry.
1. Coil Voltage (Nominal Voltage) The coil voltage, often referred to as the nominal voltage, is the primary specification that determines how much voltage is required to activate the relay. Automotive relays are commonly designed to operate with 12V or 24V systems. The 12V relay is more common in passenger vehicles, whereas 24V relays are typically used in commercial vehicles, trucks, and buses. This voltage is supplied to the coil to create a magnetic field that pulls the relay’s internal switch into a closed position, allowing current to flow through the connected circuit. 2. Coil Resistance
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