What Is a Transfer Switch?
A transfer switch is an electrical switching device that moves selected circuits between a utility supply and a standby generator. The switch prevents both power sources from feeding the same circuits at once. Transfer switches may operate manually or automatically, depending on the generator system and the installation design.
Quick Facts About Transfer Switch
Category
Power transfer equipment
Used for
Connecting generator power to selected circuits
Common confusion
A transfer switch is not a circuit breaker
Also called
ATS, Automatic Transfer Switch
Often discussed with
Generator Repair
Key Takeaways About Transfer Switch
- A transfer switch separates utility power from generator power.
- The device may serve selected circuits or a broader electrical system.
- A transfer switch is not the same as a regular wall switch.
How Transfer Switch Works
A transfer switch monitors or receives control of the available power sources, then connects the chosen source to designated circuits. In an automatic setup, the switch senses a utility outage and starts the transfer sequence. A manual setup requires a person to move the switch after confirming that generator power is available.
Related glossary terms: Load Management, Load Shedding, Main Disconnect.
The switching action keeps utility conductors and generator conductors separated during operation. A generator may supply a critical-load panel, selected branch circuits, or a larger portion of the electrical system. The transfer switch also returns the connected circuits to utility power when the generator cycle ends. Proper operation depends on compatible equipment, correct conductor connections, and a suitable grounding arrangement.
From the Center Electric Service team
When we inspect a transfer switch, we check its enclosure, conductor terminations, source labeling, and connection to the generator system. We also test the transfer sequence and confirm that selected circuits respond as intended. Our team records signs of heat damage, loose connections, corrosion, or mechanical wear before recommending repair.
Transfer Switch in Practice: A Real-World Example
A Riverside home may have a standby generator connected to a transfer switch serving refrigeration, lighting, and selected receptacles. During an outage, the switch moves those circuits to generator power and returns them to utility power after service is restored.
Related Services
Related Terms
Load Management
Load Management is a method of controlling electrical demand so connected equipment stays within the available…
Load Shedding
Load Shedding is the controlled reduction of electrical demand by disconnecting selected circuits or equipment. A…
Main Disconnect
A main disconnect is the service equipment that separates a building’s electrical system from the incoming…
Electrical Load
Electrical Load is the amount of electrical power that connected devices and equipment draw from a…
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