What Is a Manual Transfer Switch?
A Manual Transfer Switch is a switching device that connects selected electrical loads to an alternate power source, such as a portable generator. The switch prevents the normal utility supply and generator supply from feeding the same circuits at once. A person operates the switch to move designated loads between power sources.
Quick Facts About Manual Transfer Switch
Category
Power transfer equipment
Used for
Connecting selected circuits to generator power
Common confusion
Confused with an automatic transfer switch
Also called
MTS
Often discussed with
Generator Installation
Key Takeaways About Manual Transfer Switch
- A person operates the switch during a power source change.
- Only connected, designated circuits receive alternate power.
- A transfer switch is not the generator itself.
How Manual Transfer Switch Works
A Manual Transfer Switch uses mechanically linked contacts to select either utility power or an alternate source for connected circuits. The switch position shows which source supplies those circuits. The design keeps the two sources separated during a transfer, which helps prevent generator power from feeding the utility wiring.
Related glossary terms: Transfer Switch, Standby Generator, Backfeed.
During an outage, a person starts the generator, moves the switch to the alternate position, and checks that the selected loads receive power. When utility service returns, the person moves the switch back and shuts down the generator according to the equipment instructions. A Standby Generator may connect through this equipment, but the switch itself does not generate electricity.
From the GMB Electric team
When we install or inspect a Manual Transfer Switch, we identify the circuits connected to alternate power and verify the wiring path. We check the switch operation, labeling, grounding connections, and compatibility with the generator and panel. Our team also confirms that the transfer method matches the intended installation.
Manual Transfer Switch in Practice: A Real-World Example
A homeowner wants generator power for selected lighting, refrigeration, and heating controls during an outage. A Manual Transfer Switch connects those chosen circuits, so the homeowner can move them to generator power after starting the generator.
Related Services
Related Terms
Transfer Switch
A Transfer Switch is a switching device that moves electrical loads between a utility source and…
Standby Generator
A standby generator is a permanently installed backup power system that supplies electricity when utility power…
Backfeed
Backfeed is the unintended flow of electrical power from a generator, solar system, battery, or another…
Load Shedding
Load Shedding is a power management process that disconnects selected electrical loads to keep a generator…
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