ALE73B18

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Power relays are kind of switching devices which are used to control operation of electric devices and circuits. They are available in various types, the ALE73B18 being among the most commonly used power relays when drawing more than 2 amps. In this article, the application field and working principle of the ALE73B18 will be discussed.

The ALE73B18 is a 3-pole double-throw type power relay which is mainly applied in industrial automation control systems. Its contacts have a high breaking capacity, high performance, and high insulation voltage, ensuring a safe and secure switching operation. This power relay is mainly used in various kinds of control circuits, electrical equipment, and other electromechanical apparatus, especially suitable for the work in the unbalanced three-phase electric field. Moreover, its rated control voltage range is 24~440VAC/DC, the rated insulation voltage is 1000V, and the rated breaking capacity is 30A. Its operating frequency can reach up to 8000 times/hour, and the mechanical endurance is 5 million times.

The working principle of the ALE73B18 is based on the electromagnetic force. When the rated control voltage is applied to the coil, the electromagnetic force will be produced. This force will drive the movable iron core to move towards the driven piece, thus bridging two sets of moveable contact with two sets of static contact. This process completes the switching operation. If the rated control voltage is removed, the electromagnetic force will be lost and the iron core will return to the original position due to the elasticity of its springs, thus disconnecting two sets of contact. It will then complete the process of cutting off supply and disconnecting two sets of load.

In conclusion, the ALE73B18 is a widely used power relay, mainly applied in industrial automation control systems. Its contacts have a high breaking capacity, high performance, and high insulation voltage, ensuring a safe and secure switching operation. Working on the basis of the electromagnetic force, the ALE73B18 can easily control the switching operation of various circuits and devices, with a rated control voltage range of 24~440VAC/DC, a rated insulation voltage of 1000V, and a rated breaking capacity of 30A.

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