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About Current Transformers
Current transformers measure power flow and provide electrical inputs to power transformers and instruments. Current transformers produce either an alternating current or alternating voltage that is proportional to the measured current. There are two basic types of current transformers: wound and toroidal. Wound current transformers consist of an integral primary winding that is inserted in series with the conductor that carries the measured current. Toroidal or donut-shaped current transformers do not contain a primary winding. Instead, the wire that carries the current is threaded through a window in the toroidal transformer.
Current transformers have many performance specifications, including primary current, secondary current, insulation voltage, accuracy, and burden. Primary current, the load of the current transformer, is the measured current. Secondary current is the range of current outputs. Insulation voltage represents the maximum insulation that current transformers provide when connected to a power source. Accuracy is the degree of certainty with which the measured current agrees with the ideal value. Burden is the maximum load that devices can support while operating within their accuracy ratings. Typically, burden is expressed in volt-amperes (VA), the product of the voltage applied to a circuit and the current.
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Part Numbers for Current Transformers
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| TRANSFORMER CURRENT SENS | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| TRANSFORMER CURRENT SENS | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| 1TZ46 | Grainger Industrial Supply | SIMPSON ELECTRIC | Current Transformers | Transformer,Current,3 Phase,Out5A,In200A |
| 1T851 | Grainger Industrial Supply | SIMPSON ELECTRIC | Current Transformers | Transformer,Current,Out 0-5 A,In 0-200 A |
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