What Is a Transfer Switch?
A transfer switch is an electrical device that moves selected circuits between normal utility power and a standby generator. The switch prevents both power sources from feeding the same circuit at once. Manual models require a person to change sources, while automatic models sense an outage and control the changeover.
Quick Facts About Transfer Switch
Category
Power-transfer equipment
Used for
Standby generator connections
Common confusion
Not the generator itself
Also called
Generator Transfer Switch, Automatic transfer switch
Often discussed with
Generator Installation
Key Takeaways About Transfer Switch
- It separates utility power from generator power.
- It may operate manually or automatically.
- It is not the same as a generator or circuit breaker.
How Transfer Switch Works
A transfer switch routes selected circuits to utility power during normal operation. When utility power fails, a manual switch requires deliberate action, while an automatic transfer switch detects the loss and changes the source. The switching action keeps the generator supply separate from the utility supply.
Related glossary terms: Electrical Load, Line Voltage, Power Outage.
During generator installation, electricians connect the switch between the incoming power source and the circuits chosen for backup. The switch may serve a dedicated set of loads, such as refrigeration or lighting, or connect through a service-rated arrangement that handles the premises electrical supply. A generator provides the replacement power, while the transfer switch controls where that power goes.
From the San Bernardino Electrician team
When we work on generator installation, we identify the circuits that need backup and verify that the transfer switch matches the generator connection and electrical panel. We also check conductor terminations, source labeling, enclosure condition, and the switching sequence before placing the system in service.
Transfer Switch in Practice: A Real-World Example
A home may use a transfer switch to move selected refrigerator, lighting, and heating circuits to a standby generator during an outage. The switch keeps those circuits isolated from utility power until normal service returns.
Related Services
Related Terms
Electrical Load
Electrical Load is the amount of electrical power a device, circuit, or building draws while operating…
Line Voltage
Line Voltage is the electrical pressure supplied by a power system to operate equipment, lighting, and…
Power Outage
Power outage is a temporary loss of electrical service to a home, building, circuit, or wider…
Circuit Directory
A circuit directory is a written map of an electrical panel that identifies which rooms, outlets…
San Bernardino Electrician
Have Questions About Transfer Switch?
Contact San Bernardino Electrician for practical guidance on Transfer Switch and related 24 hour electrician work in San Bernardino.