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Current Transformer. Split Core CT's, when power cannot be interrupted.   Convenient current  transformers from two manufactures. Use in areas where the power cable cannot be unbuckled. Excellent for saving time when power cannot be interrupted. All have 5 amp secondary with a variety of ratio's window sizes. Data sheets available by clicking Red links.   Current Transformer-Split Core CT's  RoHS Compliant MODEL # ITI # RATIO PRICE 1.5FSH No Equivalent 250:5 to 400:5 143.70 2.5FSH No Equivalent 250:5 to 600:5 189.70 3FSH No Equivalent 250:5 to 800:5 201.20 4FSH No Equivalent 300:5 to 1000:5 212.70 6FSH No Equivalent 300:5 to 4000:5 316.20 8FSH No Equivalent 300:5 to 6000:5 373.70         2052FSH 600 400:5 to 1000:5 258.90 2052FSH 600 1200:5 to 1600:5 273.30 2052FSH 600 2000:5 287.65 2052FSH 600 2400:5 to 6000:5 293.20         3775FSH No Equivalent 500:5 to 1000:5 376.05 3775FSH No Equivalent 1200:5 to 1500:5 386.65 3775FSH No Equivalent 1600:5 to 2000:5 397.20 3775FSH No Equivalent 2500:5 to 3000:5 407.75 3775FSH No Equivalent 3500:5 to 4000:5 455.95 3775FSH No Equivalent 5000:5 to 6000:5 473.90         4011FSH 500 500:5 to 1000:5 376.05 4011FSH 500 1200:5 to 1500:5 386.65 4011FSH 500 1600:5 to 2000:5 397.20 4011FSH 500 2500:5 to 3000:5 407.75 4011FSH 500 3500:5 to 4000:5 455.95 4011FSH 500 5000:5 to 6000:5 473.90 Don't forget Shorting Blocks. Shorting Blocks prevent CT burn up when installing in a hot system.  SB4TC used in a Delta System with 2 CT's and SB6TC Terminals are used in a 3 phase 4 wire system.