Rayleigh-Instruments-RI-F368-Series-Single-&-Three-Phase-Meters-Rayleigh-Instruments-RI-F368-21-The-Rayleigh-Instruments-RI-F368-21-is-a-DIN-96-panel-mounting-Class-1-kilowatt-hour-meter-that-can-measure-single-phase-or-three-phase-3-or-4-wire-network-unbalanced-loads-The-input-is-via-a-5A-or-1A-current-transformer-driven-230-415V-50-60 Hz-system-It-has-a-pulse-output-Rayleigh-Instruments-RI-F368-21-Single-&-Three-Phase-Meter-Pulse-Output