What are Relays?
A Relay
comprises of an electromagnet and a contact unit. The definition is: Activating the contact unit using electromagnetic attraction, which is produced when electric current exceeding the specified value flows to the electromagnet; the voltage and current (input signal) applied to the coil opens or shuts the contact.
Simply put,
a relay receives electrical signals from the switch, etc. and passes them to the output part such as a motor.
A Relay at an Athletic Meet
Relay of Control Devices
Classification of Relays
Largely divided, there are "two types".
Control Relay
With a Contact
Mechanical Relay
The contact opens and shuts mechanically
Without a Contact
Semi-Conductor Relay
(PhotoMOS/SSR (Solid State Relays))
The contact (output part) is a semi-conductor
and does not open and shut mechanically.
Applications of Relays
A relay is used in various pieces of equipment in the world.
Digital Household Electrical Appliances
- Slim-type TVs
- Home video game consoles
OA Equipment
- Copiers
- Multi-functional FAX machines
Automobile Devices
- Car navigation
- Anti-theft car devices
Security Devices
- Security cameras
- Warning devices
- Access control devices
White Goods
- Refrigerators
- Microwave ovens
- Washing machines
- Air conditioners
- Rice cookers
Industrial Equipment
- Industrial robots
- Working machines
- Packing machines
Medical Devices
- Blood pressure gauges
- Medical ultrasound equipment
- Care beds
