What is LT & HT, What type of Breakers are used in LT side

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Accepted Answer

LT stands for Low Tension and HT stands for High Tension. Miniature Circuit Breakers (MCBs) and Air Circuit Breakers (ACBs) are used in LT side.

LT refers to the voltage range of 240V to 415V while HT refers to the voltage range above 415V.
MCBs are used for protection against overload and short circuit in LT side.
ACBs are used for protection against overload, short circuit and earth fault in LT side.
HT side uses circuit breakers like Vacuum Circuit Breakers (VCBs), SF6 Circuit Breakers, and Oil Circuit Breakers.
VCBs are used for protection against overload and short circuit in HT side.
SF6 Circuit Breakers and Oil Circuit Breakers are used for protection against overload, short circuit and earth fault in HT side.

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