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This involves replacement of the old circuits or elements, within the existing system, with a new element. Typically, a retro fit is carried out on an existing control system which is of good condition and has a considerable time remaining until its end of life.

A sample of retrofitting might be upgrading a feeder MCCB circuit from Four Hundred Ampere Thermal Magnetic MCCB to six hundred thirty Ampere with Electronic Trip. This would be done for additional load to the building and also provides better electrical co-ordination between control panels.

Another intention for a retrofit can be damaged or worn out circuit breakers or substituting outdated protection or control relays. Replacing these will mean panels will have better performance and protection.

Basic retrofits pose very little disturbance to site and using a staged retrofit for several circuits permits the user to have higher control of shutdown periods and site allocations.