Relays are essential components in electrical and electronic systems, serving as switches that control circuits by using an electromagnet to open or close contacts. The selection of a suitable relay depends on various parameters that dictate its performance and suitability for specific applications. Understanding relay parameters is crucial for designing reliable and efficient systems. In this article, we will explore the key relay parameters that engineers must consider when choosing a relay for their projects.

1. Rated Voltage One of the most important relay parameters is the rated voltage, which refers to the voltage that the relay is designed to operate at. There are two key rated voltages to consider： the coil voltage and the contact voltage. The coil voltage is the voltage required to activate the relay, while the contact voltage represents the maximum voltage the relay’s contacts can safely handle when switching the circuit. It is essential to ensure that the relay’s rated voltage matches the voltage levels of the application to avoid damaging the relay or causing malfunction. 2. Rated Current