Electromagnetic relays are integral components in modern electrical systems, playing a crucial role in automation, control, and protection applications. As electromechanical devices, electromagnetic relays are used to control the opening and closing of circuits based on the presence of an electrical signal. By utilizing the principles of electromagnetism, these relays allow low-power circuits to control higher-power circuits, thus enabling efficient and safe electrical operations.
What is an Electromagnetic Relay? An electromagnetic relay consists of a coil, an armature, contacts, and a spring mechanism. The coil, when energized, creates a magnetic field that attracts a movable armature. This armature is attached to the relay’s contacts, which open or close depending on the movement caused by the armature. The spring ensures that the armature returns to its default position when the coil is de-energized. There are typically two main types of contacts： Normally Open (NO), which are open when the relay is inactive and close when the coil is energized, and Normally Closed (NC), which are closed when the relay is inactive and open when the coil is energized.