What Is a Transfer Switch?
A transfer switch is an electrical device that changes a building's power source from utility service to a generator. It connects the selected source to the circuits it serves and keeps the sources separated. Transfer switches are used in backup power systems for homes and other buildings.
Quick Facts About Transfer Switch
- Category
- Backup power equipment
- Used for
- Selecting a power source
- Common confusion
- Not a generator
- Often discussed with
- Generator Transfer Switch Installation, Generator Installation
Key Takeaways About Transfer Switch
- Manual and automatic models operate differently.
- The connected circuits determine what receives backup power.
- A transfer switch is not a generator.
How Transfer Switch Works
A transfer switch uses internal contacts to select the available power source. In a manual system, a person changes the switch position. An automatic system senses a utility outage and manages the change without that action.
Related glossary terms: Backfeeding, Breaker Panel, Electrical Load.
The switch serves the circuits connected to it. Those circuits may supply part of a home or the whole electrical panel. The generator's capacity limits how much equipment it can support at once.
The switch also separates utility power from generator power during a change. That separation helps prevent backfeeding, which sends generator power toward the utility lines. When utility service returns, the switch can return the connected circuits to that source.
From the Earth Electric team
When we plan a transfer switch installation, we look at the panel and the circuits you want to support. We also check how the generator connects to the system. That helps us choose equipment suited to the setup.
Transfer Switch in Practice: A Real-World Example
A Miami homeowner wants backup power for a refrigerator and selected lights. A generator transfer switch installation connects those circuits to a switch that can accept power from the home's generator.
Related Terms
Backfeeding
Backfeeding is the flow of electricity through a circuit in a direction opposite to its intended supply path.
Breaker Panel
A breaker panel is an electrical enclosure that distributes power to circuits in a building.
Electrical Load
An electrical load is the demand for electrical power placed on a circuit or electrical system by connected equipment.
Load Calculation
A load calculation is an estimate of the electrical power a building or selected equipment needs.
Earth Electric
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