understanding the 220v ac relay： applications, working principle, and considerations
Release time:2025-10-20 03:27:33
A 220V AC relay is an essential electrical component widely used in various applications, from household appliances to industrial automation systems. It allows low-power control circuits to manage high-power devices, such as motors, lights, and other heavy-duty equipment. In this article, we will explore the working principle of 220V AC relays, their applications, key specifications, and important considerations when selecting and using them.
Working Principle of a 220V AC Relay
A 220V AC relay operates based on the principles of electromagnetism. At its core, a relay consists of two main components： the coil and the contacts.
Coil (Electromagnetic part)： The coil is energized by the 220V AC input voltage. When the voltage is applied, an electromagnetic field is generated around the coil. This magnetic field attracts a movable armature inside the relay, which causes the relay's contacts to change positions (from open to closed or vice versa).
Contacts： The relay has at least one set of contacts that are either normally open (NO) or normally closed (NC). When the coil is energized, the contacts shift position. A normally open (NO) contact remains open when the relay is not energized but closes once the relay is triggered. Conversely, a normally closed (NC) contact remains closed in the absence of voltage but opens when energized.
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