The main Low Voltage Switch is used to disconnect the electricity. Electricity can arc (jump) from the switches’ contact at a high current. These switches are designed to safely disconnect the circuit according to the IEC 60947-3:2008 standard.
Circuit Breakers are designed for the protection of Short circuits and overload. A breaker will ‘tripped’ when a Short Circuit or an Overload occurs. A tripped breaker can be reset to re-connect the circuit. However, they have a limited lifetime for the Short-Circuit fault.
Fuses are also designed for the protection of Short Circuit and Overload. A Fuse will melt and ‘break’ when a Short Circuit or an Overload occurs, thus disconnecting the circuit. A fuse can work much faster than a Circuit Breaker giving greater protection but may only be used once and has to be replaced if a fault occurs.
Separate Protection relays are used to protect against Over Voltage, Under Voltage, Phase Lost, Phase Sequence, Earth Leakage, or Surge Protection.
The power meter displays electrical parameters such as Voltage, Current, Active Power, Reactive Power, and Harmonics. It is used to measure the quality of the power as well as to measure and record the amount of power being used for the purpose of Energy Saving.
UPS is essentially a big battery and inverters that switch Alternating Current (AC) to Direct Current (DC) for energy storage and DC to AC to supply to load.
Generator (Diesel) is made up of a diesel engine and an electric generator. It is used to provide temporary power in case the primary power failure. The generator controller can detect that the primary power has failed and starts up the generator.
An ATS is an automatic switch that detects that the secondary source of power is ready and switches the power source over. It does the same when the primary power return to normal.
A manual transfer switch is simply an ATS without a motorized switching unit. It has to be activated manually.