Why Earth Pin Is Bigger: Have you ever wondered why one pin in the 3-pin plug of an AC, refrigerator or microwave is bigger and thicker than the other two? This is not just for design, but for safety. This big pin works for earthing and is connected first to the socket. If for some reason current leaks in the equipment, it conducts the excess current to the ground, thereby significantly reducing the risk of electric shock.

Why is a 3-pin plug used in heavy equipment?

• The 3-pin plug is used to protect equipment that consumes heavy power.


• The body of appliances like fridge, AC, geyser and microwave is mostly made of metal.


• In such devices, there is a high risk of current leaking or body electric shock.


• This risk is much less in low power appliances like mobile charger, TV or trimmer, so even a 2-pin plug is sufficient in them.


• If heavy equipment does not have earthing, touching it may result in electric shock.


• For this reason, 3-pin plug is used for safety in heavy electrical appliances.

Why is one pin longer in a 3-pin plug?

• In a 3-pin plug, one pin is made longer than the other two.


• When the plug is inserted into the socket, this long pin is connected first.


• With this, earthing of the equipment is already connected.


• If there is current leakage in the equipment or any fault occurs, then the excess current goes to the ground through earthing.


• Due to this, the current does not reach your body and the risk of electric shock is significantly reduced.

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Why is one pin thicker in a 3-pin plug?

• In a 3-pin plug, the earthing pin is thicker than the other two.


• Due to the thick pin the plug cannot be inserted incorrectly into the socket.
  Earthing is always connected first.


• If there is current leakage in the equipment, the excess current goes safely to ground.


• This reduces the risk of short circuit and electric shock.


• Electricity also flows easily in thick pins.


• For this reason, heavy appliances like fridge, AC and geyser work safely.