12kV indoor busbar-type epoxy resin cast current transformer for switchgear. Through-core design with dual windings for metering and protection. Rated insulation level 12/42/75kV, 50/60Hz, secondary current 5A or 1A. Compliant with IEC 61869 and GB/T 20840 standards. Vacuum epoxy casting, low partial discharge, excellent moisture resistance. Available in D/E structural sizes, easy installation on busbars.
12kV indoor busbar-type CT with dual windings for metering and protection, suitable for MV switchgear busbar applications.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869, GB/T 20840 |
| Model Code | LMZB3-10GWD-E | Factory nameplate marking |
| Primary Voltage | 12kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A or 1A | Ratio check at rated frequency |
| Accuracy Class | 0.2S, 0.5, 5P20, 5P30 | Accuracy test (IEC 61869-2 / IEEE C57.13) |
| Rated Burden | [On Request] | Burden test at rated VA |
| Insulation Type | Dry Epoxy Resin | Dielectric tests per standard |
| Insulation Level (BIL) | 12/42/75kV | Power-frequency & lightning impulse withstand |
| Standards | IEC 61869, GB/T 20840 | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | Indoor busbar-type through-core epoxy cast | Per datasheet limits |
Ideal For
Not Recommended For
Connect secondary terminals 1S1/1S2 for metering winding and 2S1/2S2 for protection winding. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Ensure polarity markings are observed for proper relay operation.
Compliant with: IEC 61869, GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of this CT?
A: The insulation level is 12/42/75kV, meaning 12kV system voltage, 42kV power-frequency withstand, and 75kV lightning impulse withstand.
Q: Can this CT be used for both metering and protection?
A: Yes, it has dual windings with accuracy classes 0.2S/0.5 for metering and 5P20/5P30 for protection.
Q: Is this CT suitable for outdoor use?
A: No, it is designed for indoor use only, as indicated by 'Indoor' in the product name.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated primary current I1n (A) | Accuracy classCombined | Rated output (VA) 0.2 class | Rated output (VA) 0.5 class | Rated output (VA) 5P20 class | Rated output (VA) 0.2S class | Rated output (VA) 5P30 class | Rated output (VA) 0.5S class | Model |
|---|---|---|---|---|---|---|---|---|
| 50E | 0.2/0.5/5P20 | / | / | 10 | / | 10 | / | LZZBJ9-10GWA |
| 100E | 0.2/0.5/5P20 | 10 | 10 | 10 | / | 10 | / | LZZBJ9-10GWA |
| 0.2/0.5/5P20 | 10 | 10 | 10 | / | 10 | / | LZZBJ9-10GWB | |
| 200E | 0.2/0.5/5P20 | 10 | 10 | 20 | / | 20 | / | LZZBJ9-10GWB |
| 0.2/0.5/5P20 | 10 | 10 | 20 | / | 20 | / | LZZBJ9-10GWC | |
| 300E | 0.2/0.5/5P20 | 10 | 10 | 20 | / | 20 | / | LZZBJ9-10GWC |
| 400E | 0.2/0.5/5P20 | 15 | 15 | 20 | / | 20 | / | LZZBJ9-10GWC |
| 600E | 0.2/0.5/5P20 | 15 | 15 | 20 | / | 20 | / | LZZBJ9-10GWC |
| 800E | 0.2/0.5/5P20 | 15 | 15 | 20 | / | 20 | / | LZZBJ9-10GWC |
| 1000-2500E | 0.2/0.5/5P20 | 15 | 15 | 20 | / | 20 | / | LZZBJ9-10GWC |
| 0.2/0.5/5P20 | 15 | 15 | 20 | / | 20 | / | LZZBJ9-10GWC | |
| 1200-2500E | 0.2/0.5/5P20 | 20 | 20 | 20 | / | 20 | / | LZZBJ9-10GWC |
| 0.2/0.5/5P20 | 20 | 20 | 20 | / | 20 | / | LZZBJ9-10GWC | |
| 3000-4000E | 0.2/0.5/5P20 | 20 | 20 | 20 | / | 20 | / | LMZB3-10GWD |
| 0.2/0.5/5P20 | 20 | 20 | 20 | / | 20 | / | LMZB3-10GWE |
Dimension & outline drawing of LMZB3-10GWD-E — click image to zoom / view original.
