Main Supply vs Generator: Understanding Automatic Power Switching
Many homes and businesses use a generator as a backup when utility power is interrupted. The important part is not only having a backup source, but also managing the transition between the two power sources correctly.
An automatic changeover system is designed to control this transition, helping ensure that the load is connected to the intended source without relying on manual switching.
Main Supply and Generator Supply
- Main Supply — The normal utility source used during standard operation.
- Generator Supply — A backup source used when the normal supply is unavailable.
- Changeover Mechanism — Controls which source is connected to the load.
What Happens During a Power Failure?
When the main supply is lost, the changeover system detects the configured condition and transfers the load to the available backup source. The exact sequence depends on the equipment and installation design.
What Should You Check Before Installation?
- Confirm whether the installation is single-phase or three-phase.
- Check the rated current and expected connected load.
- Verify generator output and compatibility with the changeover system.
- Ensure correct earthing, protection and wiring practices.
Correct sizing and installation are essential for reliable operation. Always have the electrical system assessed and installed by a qualified professional.
SELFON Switchgears offers practical switching solutions designed to support reliable power management across residential and commercial applications.