KLEIN TOOLS Circuit Breaker Finder and Wire Tracer Kit ET450, Adjustable Sensitivity

The KLEIN TOOLS ET450 Advanced Circuit Breaker Finder and Wire Tracer Kit is a professional circuit tracer for identifying energized and non-energized breakers, fuses, and wires, with adjustable receiver sensitivity and a transmitter that connects to the circuit.

• Traces energized and non-energized circuits — helps identify breakers, fuses, and wires.
• Adjustable receiver sensitivity — lets you tune signal detection for the tracing task.
• Audible and visual signal-strength feedback — helps distinguish the signal as you trace.
• Built-in flashlight and non-contact voltage function — supports visibility and wire energization checks.
• Transmitter voltage indicators — show levels from 12V through 480V.
• Complete kit with leads, batteries, instructions, and a carrying case — brings the tracing components together for transport and storage.

Finding the right circuit or following a wire can involve more than locating a breaker in an open panel. The ET450 is made for electrical tracing tasks involving circuits, wires, conduit, or pipes, including isolating one wire within a bundle. Its transmitter and receiver work together to help follow the transmitted signal, while adjustable sensitivity supports different tracing conditions.

What can the ET450 trace?

The ET450 traces breakers, fuses, and wires, and it can also be used to trace conduit and pipes or isolate a single wire within a bundle. Connect the transmitter to a circuit, then use the receiver to locate the signal. This range of tracing tasks makes the kit suited to electrical identification where the target may be one wire among several.

• Designed for energized and non-energized circuit tracing.
• Useful for tracing conduit or pipes as well as wires.
• Can help identify one wire within a bundle.

Can the receiver detect a signal through walls or underground?

Yes. Adjust the receiver’s sensitivity to detect the transmitter signal through drywall, cement block, shielded cable, or underground. The instructions provide guidance for underground and shielded-cable tracing, so follow those directions for those applications. Sensitivity adjustment lets the receiver be tuned to the task rather than relying on a single fixed setting.

• Signal detection includes drywall and cement block.
• Shielded-cable and underground tracing are supported with the manual’s instructions.

What information and functions does the transmitter and receiver provide?

The transmitter has external AC/DC voltage indicators for 12V, 48V, 120V, 240V, and 480V. On the receiver, a built-in flashlight helps illuminate low-light work areas, and the non-contact voltage (NCV) function checks whether a wire is energized. These features sit alongside the main tracing function, bringing voltage indication, visibility, and a wire energization check into the kit.

• Transmitter indicators cover five voltage levels: 12V, 48V, 120V, 240V, and 480V.
• Receiver includes a flashlight and NCV function.

What comes with the ET450 circuit tracer kit?

The kit includes a transmitter, receiver, blade and ground prongs, alligator clips, 3-foot (0.91 m) and 20-foot (6.10 m) lead adapters, AC plug leads, all required batteries, instructions, and a hard carrying case with a handle. The included leads and connection accessories support different circuit connection needs, while the case provides a way to keep the kit together for carrying and storage.

• Connection accessories include blade and ground prongs, alligator clips, and AC plug leads.
• Both 3-foot and 20-foot lead adapters are included.
• Batteries and instructions are included with the kit.

The KLEIN TOOLS ET450 is suited to electricians and other users carrying out circuit identification and wire-tracing tasks, including tracing through building materials or identifying a wire within a bundle. Its included transmitter, receiver, connection accessories, batteries, and handled hard case make it a self-contained tracing kit for those applications.