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 primary current ranges:20-150A、200A、300A、400A、500A、600-800A、1000-1250A; accuracy combinations include 0.2S/0.5S/510P10、0.2S/510P10/510P10、0.5S/510P10/510P10; rated output:10VA for 0.2S,10VA for 0.5S,15VA for 510P10; short-time thermal current 16–64 kAS, rated dynamic stable current 40–160 kA, net weight 28kg, ambient operating temperature -5℃~+40℃.
LZZBJ9-12/135b/4s is a 10kV indoor single-phase epoxy resin current transformer, suitable for medium voltage switchgear applications requiring accurate measurement and protection.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ9-12-135b-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
Ensure secondary terminals 1S1/1S2 are connected to the measuring device, and protection winding 2S1-2S2 if applicable. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869-2 terminal markings.
Compliant with: [On Request]
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: What are the available accuracy classes?
A: Accuracy combinations include 0.2S/0.5S/510P10, 0.2S/510P10/510P10, and 0.5S/510P10/510P10.
Q: Can this CT 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 I1n (A) | Accuracy classCombined | Accuracy class & rated output (VA) 0.2 (S) | Accuracy class & rated output (VA) 0.5 (S) | Accuracy class & rated output (VA) 5 (10)P10 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 20-150 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 100 I1n | 250 I1n | 28 |
| 200 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 16 | 40 | 28 |
| 300 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 24 | 60 | 28 |
| 400 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 30 | 75 | 28 |
| 500 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 40 | 100 | 28 |
| 600-800 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 48 | 120 | 28 |
| 1000-1250 | 0.2(S)/0.5(S)/5(10)P10 0.2(S)/5(10)P10/5(10)P10 0.5(S)/5(10)P10/5(10)P10 | 10 | 10 | 15 | 64 | 160 | 28 |
Dimension & outline drawing of LZZBJ9-12-135b-4s — click image to zoom / view original.
