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The GLS-EM-CT is a current transformer designed for use with a GLS-EM-MCU Crestron Green Light® Power Meter Control Unit. Current transformers are vital to metering power. Crestron® offers various split core models that work with 600, 400, and 200 Amp feeds; these devices clamp around main feeds. Solid-core models exist for 50 and 20 Amp circuits; the wire must be routed through the closed loop of the core.