The LMZBJ9-12H4 is a 12kV indoor single-phase epoxy resin busbar type current transformer designed for precise current measurement, energy metering, and protective relaying in medium-voltage electrical systems. Its epoxy resin casting fully encapsulates the busbar primary conductor, secondary windings, and annular magnetic core, ensuring reliable insulation and robust mechanical strength.
This model is equipped with three secondary windings, configurable as either one measuring winding with two protective windings or two measuring windings with one protective winding, offering flexible application options. It supports rated primary currents from 1000A to 5000A with a standard rated secondary current of 5A. The unit withstands power frequency voltage up to 3kV, operates at 50Hz or 60Hz, and complies with IEC 60044-1 and IEC 61869-1 & 2 standards. It is intended for indoor installation.
| Rated transformation ratio (A) | Accuracy classes combination | rated output(VA) | |||
| Measuring | Protective | ||||
| 0.2(S) | 0.5 | 5P10 | 5P20 | ||
| 1000/5 | 0.2/0.2 0.2/0.5 0.5/0.5 0.5/0.5/5P20 0.5/0.5/5P20/5P20 |
15 20 |
15 20 |
15 20 |
15 20 |
| 1500/5 | |||||
| 2000/5 3000/5 4000/5 5000/5 |
|||||
