When energy consumption, duty cycle, and service hours on AC or DC powered devices are important, then the CT series of current switches is of interest to you. The self-powered CTs will close a contact when an AC/DC current level is exceeded. When used as an accessory to the State101 or State110 you will know when the AC/DC device drew current that exceeded the trip point, and when it stopped. There are many applications for which current switches can be useful. A few examples include the power consumption of lighting, refrigerator/cooler duty cycles, and service hours on an elevator motor.

The CTs are set up by running one of the AC/DC power lines through the core of the CT. The CT-800 is a solid core, and the CT-805 and CT-815 are split core. Split core CTs open up to clamp over the power line making for easy installation. All of the CTs are rated to 250 Amps AC or DC, but the CT-800 is fixed to trip at 1A, the CT-805 at 1.5. The CT-815 has an adjustable trip point (1.5A to 150A) and also has an LED to indicate when the trip point is exceeded.