This unit is made up of 2 parts as you can see. The smaller part which you plug in to a outlet inside your house This is the Transmitter. The larger part is the receiver. Once you plug in the transmitter you can then scan all the circuit breakers within your power panel. As you can down through all the breakers the one that is connected to the outlet in the house will be transmitting and when the receiver unit passes over that breaker it will receive the tone and light up indicating that this circuit breaker is associated with the outlet inside your home. Some times you will get false indications so you should double check the operation if you are unsure. After finding the correct breaker you can then switch off that breaker and then check the outlet in the house and verify that it is no longer hot (powered)

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Circuit Breaker Finder, Finds Electrical Circuit Breaker of 120V Standard Electrical Outlet KLEIN TOOLS ET300

Circuit Breaker Finder, Finds Electrical Circuit Breaker of 120V Standard Electrical Outlet KLEIN TOOLS ET300

Q: can this item find the breaker if the power is off

No the transmitter needs the power from the outlet to send the signal down the line. The transmitter is the device you plug into the outlet.

Q: Does the plug in part have an indicator light on it to confirm its operational and that the outlet is live?

Yes there is a red light that comes on when the plug is plugged into a live outlet.

Q: Can i plug it in and see what Outlets are on that circuit breaker can I use the finder down the line at the different outlets on that breaker to trace

Your question is unclear, but I think you want to use it backwards. The unit has a transmitter, which you connect at an outlet (via duplex plug, clipleads, or standard light-bulb-socket adapter). Then at the service panel, you run the receiver down the circuit breakers, and it tells you (most of the time) which CB feeds that outlet. It does not allow you to select a CB and then use the device somehow to find all outlets that CB feeds. (I would love that feature as well.)

Product ID: 56788276

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Details

Brand
KLEIN TOOLS
Power source
Battery
Style
Circuit Finder
Colour
Original
Item weight
3.2 Ounces

⚡120V standard outlet compatible

📡1000-ft transmitter range

🧠Microprocessor controlled accuracy

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Description

⚡ Find your breaker faster, work smarter, and never miss a beat!

PINPOINT WITH PRECISION - Microprocessor control ensures reliable, automatic circuit breaker identification every time.
PROFESSIONAL GRADE LEGACY - Crafted by Klein Tools, a family-owned brand trusted by pros since 1857.
BATTERY LIFE YOU CAN TRUST - Auto power-off feature conserves battery, so you’re always ready for the next job.
INSTANT VISUAL CONFIRMATION - Flashing arrow indicator delivers clear, unmissable signals for quick breaker hits.
REACH FARTHER WORK SMARTER - Powerful transmitter covers up to 1000 feet, making breaker location effortless even in large spaces.

The Klein Tools ET300 Circuit Breaker Finder is a professional-grade device designed to quickly and accurately identify the corresponding circuit breaker for any 120V standard electrical outlet. Featuring a microprocessor-controlled system, a strong transmitter with up to 1000 feet range, and a flashing arrow indicator for easy identification, it ensures efficient and reliable operation. Battery-saving auto power-off and trusted Klein durability make it an essential tool for electricians and managers overseeing electrical maintenance.

Specifications

Manufacturer	Klein Tools
Part Number	ET300
Batteries	1 Lithium Ion batteries required. (included)
Item model number	ET300
Size	1 Pack
Colour	Original Version
Style	Circuit Breaker Finder
Material	Ve411YDSH26
Power Source	Battery Powered
Voltage	120 Volts
Item Package Quantity	1
Measurement Accuracy	not listed
Certification	CSA, IEC 1010
Included Components	(1) 9V Transmitter Battery
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Weight	90.6 g

Have a Question? See What Others Asked

How dose this work ?

can this item find the breaker if the power is off

Does the plug in part have an indicator light on it to confirm its operational and that the outlet is live?

Can i plug it in and see what Outlets are on that circuit breaker can I use the finder down the line at the different outlets on that breaker to trace

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