Electromagnetic relay is an electronic component, which can play the role of switch in the circuit. It consists of electromagnet, contact, spring, etc. When the electromagnet is acted by current, it will produce a magnetic field to attract the contacts to close, thus energizing the circuit. When the electromagnet stops energizing, the spring will return the contact to its original position, thus breaking the circuit.
Schematic diagram of electromagnetic relay
The following figure is the schematic diagram of electromagnetic relay:
! [Schematic diagram of electromagnetic relay ](/9xwBmQl.png)
As can be seen from the figure, the electromagnetic relay consists of electromagnet, contact and spring. Both ends of the electromagnet are connected with a power supply. When the electromagnet is energized, it will generate a magnetic field, attracting the contacts to close, thus energizing the circuit. When the electromagnet stops energizing, the spring will return the contact to its original position, thus breaking the circuit.
How to use electromagnetic relay?
The steps of using electromagnetic relay are as follows:
1. Determine the working voltage and current of the circuit and select the appropriate electromagnetic relay.
2. Lead out the coil of the electromagnetic relay and connect it to the circuit.
3. Lead out the contact of the electromagnetic relay and connect it to the circuit to be controlled.
4. Power on and observe the working state of the electromagnetic relay.
5. According to the need, a protection circuit can be added in the coil of the electromagnetic relay to protect the electromagnetic relay and other electronic components.
Application of electromagnetic relay
Electromagnetic relays are widely used in various electronic devices, such as:
1. Household appliances: TV, refrigerator, washing machine, etc.
2. Industrial equipment: machine tools, cranes, conveyors, etc.
3. Transportation: electric cars, trams, trains, etc.
4. Communication equipment: telephone, fax machine, printer, etc.
5. Other fields: medical devices, aerospace, military equipment, etc.