What is the function of electromagnetic relay

The electromagnetic relay is an electromagnetic switch. The magnetic field generated when the coil is energized pulls the armature and drives the contacts to change states, thereby realizing the on-off or switching of the circuit. The main functions include isolation, amplification, switching and protection, and are widely used in fields such as power systems, industrial control, automotive electronics and household appliances.

The role of electromagnetic relay

The electromagnetic relay is an electromagnetic switch, consisting of an electromagnetic coil, an armature, and contacts etc. composition. When the coil is energized, the generated current will generate a magnetic field, which attracts the armature and drives the contacts to switch states, thus realizing the on-off or switching of the circuit.

Principle of action

When the coil is energized, a magnetic field is generated around the coil, and the armature is attracted to the coil under the action of the magnetic field, driving the contact group to move and realizing the circuit. switch. When the coil is powered off, the magnetic field disappears, the armature is reset under the action of the spring, the contact group is also reset, and the circuit returns to the open circuit state.

Main functions

The electromagnetic relay mainly has the following functions:

• Isolation:Isolate the input and output loops, Achieve control of different voltage or current levels.
• Amplification: Amplify the input signal to drive a larger power load.
• Switching: Realize the on-off or switching of the circuit and control the current direction of different branches.
• Protection: In the event of overload or short circuit, the relay can disconnect the circuit to protect the load and system safety.

Application fields

Electromagnetic relays are widely used in various electrical systems and control circuits, such as:

• Power systems Relay protection in
• Logic control and switch in industrial control
• Signal control and load drive in automotive electronics
• Power supply control and protection in household appliances

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