This is a serious piece of electrical equipment for energy monitoring.

It's a Leviton solid-core current transformer (CT), model CDF04-K24.

In simple terms, it's a sensor that clamps around a power wire to accurately measure how much electricity is flowing through it.

Its specs are: a 400:0.1 Amp current ratio, a 1.5-inch diameter window (the hole the wire goes through), and a voltage rating of 600V.

It's designed for high accuracy – within +/- 0.3 percent – which is considered revenue-grade, meaning it's accurate enough for billing purposes.

The solid-core design makes it super reliable and less prone to damage than split-core models, but you do need to disconnect the power wire to install it (slip it over the wire, then reconnect).

It's used for sub-metering in commercial, institutional, and industrial buildings.

Think: figuring out how much energy a specific tenant, machine, or department is using (tenant cost allocation), tracking energy savings for green building initiatives like LEED, net metering for solar panels, or just general load monitoring and power quality analysis.

It connects to a compatible Leviton energy meter.

If you're an electrician, facility manager, or energy auditor setting up a detailed monitoring system, this is the kind of precise, ANSI-standard certified component you need.

It's compact, durable, and built for long-term performance.