There are numerous electrical appliances with varied specifications and usage in our day to day lives. Two of them are relays and switches. The main difference between the two is that:
- Relay is an electrically operated switch
- Switch is an electrical component that can break an electrical circuit
Relay
Relays are electrical switches that are operated by electrical impulses with the primary function to open or close the circuit.
Types of Relays
There are various types of relays, namely:
Electromagnetic relays: The relays which operate on the principle of electromagnetic attraction are known as electromagnetic relays. It is a type of a magnetic switch which uses the magnet for creating a magnetic field. The magnetic field then uses for opening and closing the switch and for performing the mechanical operation.
Latching relays: A latching relay maintains its state after being actuated. Thus, also known as stay relay or keep relay. In some applications, it is needed to limit power consumption and dissipation. This relay consists of internal magnets such as when the current is supplied to the coil.
Electronic relays: These relays are a type of an electronic switch that opens or close the circuit contacts by using electronic component without any mechanical operation. The relaying scheme here is used for the protection of the transmission line.
Non-latching relays: These relays are in a normally closed position and stay in this state without power. When power passes through the circuit, the relay switched to a normally open position by using an internal coil. This makes them useful for push-button applications such as keyboards.
Multi-dimensional relays: Multi-dimensional relay control systems with time delay are considered.
Thermal relays: These relays work on the principle of the thermal effect of electrical energy. It is mainly used in the low voltage squirrel cage induction motor and in low output rating DC motor.
Use of Relays in Home Automation
Switching things on and off again is the main feature of home automation. It is usually achieved through electronic switches or relays that are controlled by NPN or PNP transistor outputs. So, choosing a relay that matches your switching requirements can reduce the switching energy consumption by up to 80% or more.
You can buy good quality relays from Schneider Electrics and protects your house and workplace from short circuits or abnormal faults. They provide a whole range of innovative, smart and reliable relays for the smooth functioning of your home. Visit their website and choose from an extensive range of electrical protection & control devices.
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