The break off tabs are there so that you can power the top and bottom outlets differently. Most commonly so that you can have one of the outlets on a switch. A less common and generally inadvisable reason is so that you can have each outlet on a different circuit.
Table of Contents
What is a break off fin?
The break off tabs are there so that you can power the top and bottom outlets differently. Most commonly so that you can have one of the outlets on a switch. A less common and generally inadvisable reason is so that you can have each outlet on a different circuit.

Are tamper resistant outlets good?
Tamper-resistant outlets reduce the risk of electrical injuries, but they are not completely tamper-proof. Unfortunately, some people believe that tamper-resistant outlets are “child proof” when they are not. Tamper-resistant outlets do not prevent children from imitating adults and inserting plugs into outlets.
What happens if you wire a outlet backwards?
A device plugged into a receptacle with reversed polarity can remain energized even when turned off, which can short-circuit the device. Devices plugged into an outlet with reversed polarity may appear to work as usual but are unsafe and can shock you. The electrical wiring in our homes is color-coded.
What does half hot outlet mean?

A half-hot (or switched) outlet is a duplex outlet that has one half permanently “on,” or ready to provide electricity, while the other half can be turned off and on via an ordinary wall switch.
What are the tabs on an electrical outlet for?
Standard duplex receptacles have a small metal tab between the brass screw terminals. The tab conducts power to both terminals, even if you connect a hot wire to just one terminal.
How do you beat tamper resistant outlets?
To defeat a tamper-resistant outlet, angle the plug downward and apply pressure. Move the plug up and down while doing this. While speeding up, push the plug in. This will defeat the tamper-resistant outlet.
Will a GFCI work with a switch?
GFCIs receptacles cannot be switched, nor can they be split. Best bet is to use a GFCI breaker in the panel, then you can use regular receptacles that you can split and switch, and everything will be protected.