KLEIN TOOLS AC Circuit Breaker Finder Kit ET310KIT — Transmitter & Receiver, GFCI Test, Adapters, Case

The Klein Tools ET310KIT is a complete AC circuit breaker finder kit that locates breakers, tests GFCI outlets, and adapts to outlets, light sockets, and bare wires for fast, reliable circuit identification.

The ET310KIT bundles a transmitter and receiver with practical adapters and a foam-organized carrying case to simplify 90–120V AC troubleshooting. Designed for electricians, contractors, and DIYers, the kit lets you trace branch circuits without tripping breakers or guesswork. It combines audible and visual signals on the receiver with versatile connection options on the transmitter so you can match a receptacle, light, or exposed conductor to its breaker quickly and safely.

How does the ET310KIT locate the correct breaker?

The transmitter injects a signal into the circuit while the receiver scans breakers at the panel for matching output. When the receiver detects the signal it provides both visual and audible cues to pinpoint the exact breaker, reducing time spent flipping breakers at random. This approach works across typical residential and light-commercial 90–120V AC circuits.

• Transmitter sends a distinct signal through the connected outlet or fixture.
• Receiver scans breaker bank and indicates match with sound and lights.
• Reliable identification without needing to shut down the entire service.

What connection options does the transmitter offer for different fixtures?

The kit includes several adapters to connect the transmitter to many contact points: a standard plug for outlets, a light socket adapter for fixtures, an alligator clip for bare wires, and a 3-prong to 2-prong grounding adapter for older outlets. These accessories make it easy to test recessed fixtures, switched fixtures, or exposed conductors safely and effectively.

• Light socket adapter for tracing ceiling and lamp circuits.
• Alligator clip adapter to attach to bare wires or terminal screws.
• Grounding adapter to access two-prong receptacles safely.

Can the kit test GFCI outlets and wiring conditions?

Yes — the transmitter includes a built-in GFCI tester that checks GFCI tripping and common wiring faults. By using the transmitter at the receptacle you can verify that the GFCI device responds as expected and identify basic miswiring conditions before performing further work.

• Integrated GFCI test function on the transmitter for quick checks.
• Identifies common outlet wiring issues to inform repair decisions.
• Works while the transmitter is connected for simultaneous locating and testing.

How is the kit organized and transported on the job?

All components store securely in a premium carrying case with a custom foam insert so parts stay organized and protected during transport. The compact kit fits easily in a truck or toolbox and keeps adapters, leads and testers accessible for faster troubleshooting on site.

• Foam-cut tray holds transmitter, receiver and accessories in place.
• Durable case protects tools from impacts and moisture.
• Compact footprint for mobile professionals and service vans.

Who this kit is for: The Klein Tools ET310KIT is aimed at electrical professionals and competent DIYers who need a dependable, portable solution for identifying breakers, testing GFCI outlets, and diagnosing basic wiring problems on 90–120V AC circuits. If you regularly trace circuits in homes, remodels, or light-commercial settings, the ET310KIT reduces guesswork and helps you work faster with the right adapters for outlets, fixtures, and bare conductors.