Relays are widely used in electrical circuits to control high-power devices with low-power signals. They are crucial components in various applications, including automotive systems, home appliances, industrial automation, and telecommunications. To ensure optimal performance and reliability, it is important to understand the key relay parameters that influence their functionality. This article explores the essential relay parameters and their significance in choosing the right relay for specific applications.

1. Rated Voltage One of the most critical relay parameters is the rated voltage, which defines the voltage at which the relay is designed to operate reliably. It can be categorized into two types： Direct Current (DC) and Alternating Current (AC). For instance, relays often have rated voltages of 5V, 12V, or 24V DC for low-power applications, and 110V or 220V AC for higher-power devices. Ensuring that the relay’s rated voltage matches the control circuit’s voltage is essential for proper operation. 2. Rated Current The rated current is the maximum amount of current the relay can handle through its contacts without sustaining damage. This parameter ensures that the relay can switch the load without excessive heat generation or contact wear. For example, a relay designed for 10A may not function properly if subjected to higher current levels, leading to premature failure. Choosing a relay with an appropriate rated current ensures long-lasting and reliable performance.