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The Accu-CT® ACTL-0750 family of current transformers contain internal burden resistors to provide a 0.333 Vac output at rated current. If you are using an ACTL-0750 CT with something other than a WattNode® meter, you may need to know the effective output impedance of different CT models to compute the effect of external loading on the accuracy. The following table provides the burden resistance (equivalent to the output impedance) for common models. Contact CCS support for other models.

Model Burden Resistance
ACTL-0750-005 267 ohms
ACTL-0750-015 88.3 ohms
ACTL-0750-020 66.2 ohms
ACT-0750-030 44.1 ohms
ACTL-0750-050 26.4 ohms
ACTL-0750-070 18.85 ohms
ACTL-0750-100 13.18 ohms
ACTL-0750-150 8.79 ohms
ACTL-0750-200 6.58 ohms
ACTL-0750-250 5.26 ohms
  • Note: these values also apply for Option C0.6, Option NL, and Option HF.

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