cr magnetics, inc. 3500 scarlet oak blvd. st. louis mo usa 63122 v: 636-343-8518 f: 636-343-5119 web: http://www.crmagnetics.com e-mail: sales@crmagnetics.com 91 current transformers f high ratio wire lead transformers cr magnetics cr8400 series of wire lead current transformers are available in a wide range of sizes and materials to meet any ac current sensing needs. our general purpose designs are made from the highest quality silicon steel cores available, and meet most of the common ac current measurement needs. our revenue grade cts ( -n ) are made from a nickel alloy core which provides the most linear response over temperature and current level. a line of ground fault ( -g ) cts for measuring low ac currents including electrical shields. the high frequency ( -f ) products are designed for high frequency applications such as high frequency power supplies and motor drives. cr8400 series i r = maximum input current to be linearly sensed v max = maximum voltage (saturation) ct will develop t e = effective turns ratio including losses (all specifications tested at 60 hz) applications motor load measurement power meters high frequency current sensing ground fault sensing features high ratio standard footprints specifications maximum continuous primary current 4 x ir insulation voltage 3500 vac/1min storage temp. -45c thru +85 c operating temp. general purpose & nickel -40c thru +85 c operating temp. high frequency -40c thru +65 c regulatory agencies part number prefix a min b max c max d max e typ CR8401 6.99 .275 17.53 .690 22.35 .880 8.26 .325 75.08 2.275 cr8410 9.0 .35 22 .87 27.8 1.09 8.20 .323 73 2.87 cr8420 15.0 .59 30.0 1.18 36.0 1.41 9.2 .36 100 3.94 cr8448 7.11 .280 23.42 .922 29.46 1.16 11.05 .435 100 3.94 part number prefix a min b max c max d max e typ cr8449 9.14 .354 26.0 1.02 31.8 1.25 17.0 .67 100 3.94 cr8450 13.08 .515 36.83 1.45 43.18 1.70 13.97 .55 88.9 3.50 cr8459 19 .75 48 1.89 60 2.36 17.5 .67 200 7.88 package dimensions and outline (mm/in) general purpose current transformers part number i r vmax rms te (typ.) dcr ? frequency CR8401-1000 10 2.2 1009 49 20 - 1 khz cr8410-1000 20 3.1 1012 41 20 - 1 khz cr8420-1000 50 5.2 1018 22 20 - 1 khz cr8420-2000 75 9.0 1983 90 20 - 1 khz cr8448-1000 30 6.3 990 26 20 - 1 khz cr8448-2000 50 13.7 2046 106 20 - 1 khz cr8449-1000 50 11.6 1016 35 20 - 1 khz cr8449-2000 75 23 2046 150 20 - 1 khz cr8450-1000 100 16.5 1021 21 20 - 1 khz cr8450-2000 200 32 2037 73 20 - 1 khz revenue grade current transformers part number i r vmax rms te (typ.) dcr ? frequency cr8448-2500-n 40 6.6 2510 134 20 - 1 khz cr8449-2500-n 50 10.0 2490 187 20 - 1 khz cr8450-2500-n 75 12.0 2512 160 20 - 1 khz cr8459-2000-n 200 11.5 2011 74 20 - 1 khz ground fault current transformers part number i r vmax rms te (typ.) dcr ? frequency CR8401-1000-g 4 0.6 1005 49 20 - 1 khz cr8410-1000-g 7 0.8 1007 38 20 - 1 khz cr8420-1000-g 20 1.4 1011 44 20 - 1 khz high frequency current transformers part number i r vmax rms te (typ.) dcr ? frequency cr8448-2000-f 50 3.9 2015 90 20 - 200 khz cr8449-2000-f 75 7.4 2017 109 20 - 200 khz cr8450-2000-f 100 8.5 2020 63 20 - 200 khz v = i x r t e v l i v r dcr for best linearity, choose r such that v < 0.8 v l v l = vmax - t e i x dcr b a d c e
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