Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards, insulation level 12/42/75kV, rated frequency 50/60Hz, secondary rated current 5A or 1A. Optional structural types: conventional 2s, conventional 4s, dual-ratio 4s with secondary tapping; optional primary current covers 20–3150A. Accuracy-class rated outputs vary by structure: 10VA/15VA/20VA/30VA/50VA for different accuracy grades; short-time thermal current ranges 11.25–100 kA, rated dynamic stable current ranges 28–160 kA; corresponding weights:26kg（2s）、39kg（4s / dual-ratio 4s）; ambient operating temperature -5℃~+40℃.
Indoor epoxy-cast CT for 12kV systems; suitable for metering and protection in MV switchgear.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ9-12-175b-2s-4s | Factory nameplate marking |
| Primary Voltage | 10kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A/1A | Ratio check at rated frequency |
| Accuracy Class | [On Request] | 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 | [On Request] | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | Ambient: -5℃~+40℃ | Per datasheet limits |
Ideal For
Not Recommended For
connect secondary terminals 1S1/1S2 for main winding; if dual-ratio, use tapping for alternate ratio. Protection winding (if present) uses 2S1-2S2. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary circuit at one point only.
Compliant with: [On Request]
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of this CT?
A: 12kV system; power-frequency withstand 42kV; lightning impulse withstand 75kV peak.
Q: Can this CT be used outdoors?
A: No, it is designed for indoor use only.
Q: What are the available secondary currents?
A: 5A or 1A, depending on the model.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated primary current (A) | Accuracy classCombined | Accuracy class & rated output (VA) | Short-time thermal current (kA) | Rated dynamic current (kA) | Weight (kg) |
|---|---|---|---|---|---|
| 20-100 | 0.2/0.5/5P10 | 10 | 150/1s | 375/1s | 26 |
| 200 | 0.2/0.5/5P10 | 10 | 150/1s | 375/1s | 26 |
| 300-400 | 0.2/0.5/5P10 | 10 | 31.5 | 80 | 26 |
| 500 | 0.2/0.5/5P10 | 10 | 45 | 112.5 | 26 |
| 600-1250 | 0.2/0.5/5P10 | 10 | 63 | 130 | 26 |
| 1500 | 0.2/0.5/5P10 | 10 | 100 | 160 | 26 |
| 2000-3150 | 0.2/0.5/5P10 | 10 | 100 | 160 | 26 |
Dimension & outline drawing of LZZBJ9-12-175b-2s-4s — click image to zoom / view original.
