The S50 Series AC current clamp on CT along with the high content permalloy core makes them well suited for power quality applications.The S50 clamp on ct is a general purpose 1200A AC current clamp designed for use with DMMs & BNC, power loggers and energy meter calibration instruments that have a current input. FEATURES UL, CE CNAS mark; High content permalloy core; Holding wire diameter: φ52mm; Conforms to EN 61010, 600V CAT III; Low phase shift for power measurement; Industrial design & beautiful appearance; Improved ergonomic design & easy operation; Basic parameters : Ratio:1000: 1 , 2000:1, 1000:5 (customized) Accuracy class:0.1%, 0.2%, 0.5% Primary current: 0 - 500A AC and 0-1000A AC Secondary current: 0-1A or 0-5A AC Secondary voltage:0 - 0.5V AC and 0 - 1V AC; Load capacity:≤20Ω, standard 4Ω Over voltage category:CAT III 600V info@gfuve.com 86-15910663251 https://www.gfuvegroup.com/ac-current-clamp/1200a-2mhz-bandwidth-oscilloscope-ac-current-clamp-on-ct.html