Circuit Breaker

Ratings:

Type

Voltage Range

Application

High Voltage (HV)

Above 66 kV

Transmission substations, power grids

Medium Voltage (MV)

1 kV – 66 kV

Distribution substations, industrial plants

Low Voltage (LV)

Below 1 kV

Homes, buildings, factories

 

Types:

Type

Voltage Level

Application

Vacuum Circuit Breaker (VCB)

MV

Industrial and distribution substations

Vacuum Generator Circuit Breakers

MV

Industrial & utility power plants

SF6 Generator Circuit Breakers

HV

Large power stations, hydro & thermal plants

SF₆ Circuit Breaker

HV/MV

Transmission & high-power applications

Vacuum Contactors

MV

Industrial motors, capacitor switching

Oil Circuit Breaker (OCB)

HV

High-power transmission substations

Air Circuit Breaker (ACB)

LV

Industrial switchgear, backup protection

MCB and MCCB

LV

Homes, commercial buildings