一特型号的电磁继电器线包从低压开始加电压并逐渐增加，当增加到铁芯开始吸合时的电压，叫吸合电压。当电压再逐渐下降，到某一电压铁芯又脱开，这一电压叫释放电压。吸合电压高于释放电压。当一个继电器安装到一个电路中，为保证继电器能可靠地稳定工作，电路所提供的工作电 A special type of electromagnetic relay wire package starts from the low voltage and gradually increases, and when it increases to the voltage at which the core begins to pull, it is called the pull-in voltage. When the voltage is gradually reduced, the iron core is released again at a certain voltage. This voltage is called release voltage. The pull-in voltage is higher than the release voltage. When a relay is installed in a circuit, the working power provided by the circuit ensures that the relay can work reliably and stably.