Klein Tools ET310 AC Circuit Breaker Finder and GFCI Outlet Tester User Manual

1. Important Safety Information

Read, understand, and follow all warnings and instructions before operating the Klein Tools ET310 AC Circuit Breaker Finder and GFCI Outlet Tester.

• Before each use, verify tester operation by testing on a known live and correctly wired receptacle and circuit.
• DO NOT use if the tester appears damaged in any way.
• Always consult a qualified electrician to resolve wiring problems.
• The tester is intended for indoor use only.
• The tester is designed for use with 120V AC electrical systems. DO NOT connect to higher voltage electrical supplies.
• If using accessories to connect to bare wires, ensure that the circuit is not energized before inspecting, applying, or removing the transmitter.
• Exercise extreme caution around energized, bare wires, especially when working in or around an open breaker panel.

2. Product Overview

The Klein Tools ET310 is a two-part system designed to accurately locate the correct circuit breaker in a panel connected to an electrical outlet or fixture. It also features an integrated GFCI outlet tester for inspecting wiring conditions and testing GFCI devices.

Image 1: The Klein Tools ET310, showing both the Receiver and Transmitter units.

Key Features:

• Accurate Circuit Breaker Identification: Quickly and precisely locates the correct breaker.
• Two-Part System: Consists of a Transmitter (plugs into outlet) and a Receiver (scans breaker panel).
• Clear Indications: The Receiver provides both visual and audible cues when the correct breaker is found.
• Wide Compatibility: Operates on 90-120V AC circuits.
• Built-in GFCI Tester: The Transmitter includes a GFCI outlet tester to check wiring and GFCI functionality.
• Convenient Storage: The Transmitter docks into the Receiver for compact storage.
• Universal Connectivity: Three-pin plug for North-American style grounded electrical outlets.

Image 2: Diagram highlighting key features such as visual/audible indicators, GFCI testing, and integrated storage.

3. Setup

3.1 Battery Installation

The Klein Tools ET310 Receiver requires one 9V battery (included). Ensure the battery is correctly installed before use.

1. Locate the battery compartment on the Receiver unit.
2. Open the compartment cover.
3. Insert one 9V battery, observing the correct polarity (+/-).
4. Close the battery compartment cover securely.

3.2 Initial Check

Before using the ET310 for any task, always perform an initial check on a known live and correctly wired outlet to confirm proper functionality.

4. Operating Instructions

4.1 Using the GFCI Outlet Tester (Transmitter)

The Transmitter unit can be used independently to test the wiring condition of a standard North-American style grounded electrical outlet and to test GFCI devices.

1. Plug the Transmitter into the outlet you wish to test.
2. Observe the LED indicators on the Transmitter. Refer to the "Wiring Condition Codes" table below for interpretation.
3. To test a GFCI outlet, press the "PUSH TO CHECK GFCI" button on the Transmitter. A working GFCI should trip, cutting power to the outlet. Reset the GFCI after testing.

Image 3: The Transmitter unit plugged into a wall outlet for testing.

Wiring Condition Codes:

Image 4: Detailed view of the Transmitter's GFCI test button and LED indicators for wiring conditions.

4.2 Locating a Circuit Breaker

To find the circuit breaker for a specific outlet or fixture, follow these steps:

1. Connect the Transmitter: Plug the Transmitter into the electrical outlet or fixture whose circuit breaker you want to locate. Ensure the outlet is live (powered).
2. Prepare the Receiver: Turn on the Receiver unit.
3. Scan the Breaker Panel: Go to your electrical service panel. Slowly move the tip of the Receiver over each circuit breaker.
4. Identify the Breaker: The Receiver will provide both visual (flashing LED) and audible (beeping) indications when it detects the signal from the Transmitter. The strongest and most consistent signal indicates the correct circuit breaker.
5. Verify: Once a breaker is identified, turn it off. Check if the power to the outlet/fixture where the Transmitter is plugged in has been cut. If so, you have found the correct breaker.

Image 5: The Receiver unit scanning a circuit breaker panel to identify the correct breaker.

Tip for Accuracy: For best results, when scanning the breaker panel, move the Receiver tip across each breaker individually, lifting it slightly between each breaker rather than dragging it continuously. This helps the tool "learn" the panel and provides more precise identification.

5. Maintenance

5.1 Cleaning

Wipe the unit with a dry, lint-free cloth. Do not use abrasive cleaners or solvents.

5.2 Storage

When not in use, dock the Transmitter into the Receiver for compact and secure storage. Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.

Image 6: The Transmitter unit securely docked into the Receiver for convenient storage.

5.3 Battery Replacement

Replace the 9V battery in the Receiver when the low battery indicator appears or if the unit does not power on. Refer to Section 3.1 for battery installation instructions.

6. Troubleshooting

• Inaccurate Breaker Identification:
  • Ensure the Transmitter is securely plugged into a live outlet.
  • Scan the breaker panel slowly and deliberately, moving the Receiver tip across each breaker individually, lifting it slightly between each one. Avoid dragging the tip continuously.
  • Minimize electrical interference from other devices or wiring near the panel.
  • If the panel is very old or messy, consider removing the breaker panel cover (only if qualified and with extreme caution) to scan the wires directly, as suggested by some users.
• No Indication from Receiver:
  • Check if the Receiver is powered on.
  • Verify the 9V battery in the Receiver is installed correctly and has sufficient charge. Replace if necessary.
  • Ensure the outlet where the Transmitter is plugged in is live and correctly wired (check with the GFCI tester function).
• GFCI Test Button Does Not Trip GFCI:
  • Ensure the outlet is a GFCI-protected outlet.
  • Verify the outlet is live and correctly wired using the Transmitter's LED indicators.
  • If the GFCI still does not trip, the GFCI outlet may be faulty and should be inspected by a qualified electrician.

7. Specifications

8. Warranty and Support

For warranty information and customer support, please refer to the official Klein Tools website or contact their customer service directly. Keep your purchase receipt for warranty claims.

Contact Information: Please visit www.kleintools.com for the latest support resources and contact details.