Electrical Switch - Basics & Use

A switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit. Switch is a device which is designed to make or break the current in one or more circuit. It simply transfers the moving contact from one position to another. They are binary devices which can be in one of the two states either ON or OFF.A light switch opens or closes an electrical current to turn on a light fixture, ceiling fan or similar electrical device.

Modular switches are modern switches, which can be found in any home, office, or commercial premises. They have a number of advantages over conventional non-modular electrical switches.

The main features that distinguish them from traditional ones are aesthetics, ease of use and safety. The conventional switches were exposed to metal screws and wiring which stood a chance of causing a mishap or shock. On the other hand, the modular switches are free from any metallic parts on the switchboard. These switches ensure that there is no risk of electrical shock. These switches are crafted out of high-quality material without any metal parts on the front face.

Different type of switches serves a different purpose, knowing about their basic functionalities help in making purchase decision.

Single Pole Switch

A single pole switch has one input and one output, it has two states; “on” or “off”. They can be wired either normally open or normally closed and can be either latching or momentary.

Single pole switches are common, simple light switches. They control one circuit & offer a regular off and on function. Most switches in a typical home tend to be single pole.

Double Pole Switch

A double pole switch is simply two single switches mechanically coupled together, so both operate at the same moment. Double pole switches make it possible to isolate appliances safety. They are often used to completely disconnect a circuit - both line and neutral.

             

Severing one pole will shut off the appliance, however it will leave the appliance's internal parts "floating" at whatever the voltage is on the other wire & there's a chance of neutral not being safe. In that case you would want the maintenance shut-off switch to shut off neutral too. If neutral is safe enough, barring a neutral problem. 

Double pole switches are more common in industrial settings / factories; however they can be used as a safety shut-off for a residential appliance.

They tend to be used for appliances with heavy loads like cookers and showers. It is important to check the rating of your product; 20A double pole switch is likely to be suitable for small ovens, whereas regular ovens are likely to need 32A DP switch.

Another reason to use a double pole switch is due to regulations; that mean you need to have local means of isolation for certain products. 








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