CHINT · Current measurement
Product overview
CHINT NCTK split-core current transformers for AC current measurement. Select the current ratio and a compatible window size; this page offers documented 5A-secondary configurations only.
Technical selection summary
| Input / output | AC50/60Hz; selected primary-to-secondary ratio. Secondary output:5A. Separate1A, mA and333mV variants shown in the family reference are not interchangeable with the selected5A output. |
|---|---|
| NCTK-24 selection | 100/5A,150/5A,200/5A,250/5A,300/5A; window diameter24mm; nominal accuracy class1. |
| NCTK-36 selection | 200/5A,250/5A,300/5A: class1;500/5A: class0.5. Window diameter36mm. |
| NCTK-50 selection | 600/5A,800/5A,1000/5A; window diameter50mm; nominal accuracy class0.5. |
| Dimensions, mm | Current manufacturer web table: NCTK24 A47/B71/C22/E38/F52; NCTK36 A58/B82/C26/E42/F56; NCTK50 A79/B110/C31/E47/F67. L1500mm for these5A versions; letter definitions are retained in the outline below. |
| Meter matching | Use only a meter/input explicitly rated for5A CT secondary and set its primary ratio correctly. DDSU666/DTSU666 family names alone do not establish compatibility: some versions require mA or voltage-output sensors. |
| Burden and installation | Confirm the supplied CT label, permissible burden and complete secondary circuit before installation. The generic20Ω row in the old family sheet is not published as a rated burden for these5A versions. Never leave a current-output CT secondary open while primary current flows. |
| Source / version | Selection and dimensions follow the current CHINT IoT product page. The complete older catalogue remains downloadable for reference; its differing legacy outline values do not override the current web table. |
Gallery photographs illustrate the NCTK family; read the selected model and ratio. The full family image includes output versions outside this listing. Match window clearance, secondary output, burden and meter input before ordering.
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