Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards, rated insulation level 12/42/75kV, 50/60Hz, secondary current 5A/1A. Optional primary current ranges:20-200A、300A、400A、500-600A、800A、1000A; accuracy combinations of 0.2S/5P、0.5S/5P with diversified rated output including 10VA/15VA/20VA/30VA for different windings. Matched withstand parameters, net weight 21kg, operating temperature -5℃~+40℃.
Indoor epoxy cast CT for 10kV systems; suitable for metering and protection in MV switchgear.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869 / GB/T 20840 |
| Model Code | LZZB3-10 | Factory nameplate marking |
| Primary Voltage | 0.66kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A | Ratio check at rated frequency |
| Accuracy Class | 0.2S/0.5S/0.5/1.0 | 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) | [On Request] | Power-frequency & lightning impulse withstand |
| Standards | IEC 61869 / GB/T 20840 | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | [On Request] | Per datasheet limits |
Ideal For
Not Recommended For
Connect primary through bushing; secondary terminals 1S1/1S2 for metering, 2S1-2S2 for protection. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869 terminal markings.
Compliant with: IEC 61869 / GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level?
A: 12kV system; power-frequency withstand 42kV; lightning impulse withstand 75kV peak.
Q: What accuracy classes are available?
A: 0.2S/0.5S/0.5/1.0 for metering, with 5P for protection.
Q: Can it be used outdoors?
A: No, it is designed for indoor use only.
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) 0.2 (5) | Accuracy class & rated output (VA) 0.5 (5) | Accuracy class & rated output (VA) 5P10/5P15 | Short-time thermal current (kA/S) | Rated dynamic current (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 20 | 0.2(5)/0.2(5) | 15 | 15 | 15 | 100 | 250 | — |
| 300 | 0.2(5)/0.5(5) | 15 | 15 | 15 | 24 | 60 | — |
| 400 | 0.2(5)/0.5(5) | 15 | 15 | 15 | 30 | 75 | 15 |
| 500 | 0.2(5)/5P10 | 15 | 15 | 15 | 40 | 100 | — |
| 600-800 | 0.5(5)/5P10 | 15 | 15 | 15 | 48 | 120 | — |
Dimension & outline drawing of LZZB3-10 — click image to zoom / view original.
