Indoor low voltage protection current transformer, 0.66kV rated, epoxy resin casting type, for protection applications in low voltage distribution systems. Complies with IEC 61869 and GB/T 20840 standards. Wide range of current ratios available, multiple protection accuracy classes 5P, 10P. Compact size, easy installation, suitable for switchgear and panel mounting. Customizable ratios and specifications.
LMK-0.66P is a low-voltage protection current transformer for indoor use, suitable for protection applications in LV distribution systems.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869 / GB/T 20840 |
| Model Code | LMK-0.66P | Factory nameplate marking |
| Primary Voltage | 0.66kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A/1A | Ratio check at rated frequency |
| Accuracy Class | 5P/10P | 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 winding in series with the line. Secondary terminals are 1S1 and 1S2 for the main protection winding. If a second winding exists, use 2S1-2S2. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary circuit at one point only. Follow IEC 61869 / GB/T 20840 for installation.
Compliant with: IEC 61869 / GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation type?
A: Dry epoxy resin.
Q: What accuracy classes are available?
A: 5P and 10P.
Q: Is it suitable for outdoor use?
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.
| Model | Overall dimensions | Window dimensions (mm) a×e | ||
|---|---|---|---|---|
| W | D | H | ||
| LMK(1,2,3)-0.66/60P | 129 | 75 | 200 | 63×54 |
| LMK(1,2,3)-0.66/80P | 164 | 75 | 185 | 83×55 |
| LMK(1,2,3)-0.66/100P | 190 | 75 | 185 | 104×57 |
| LMK(1,2,3)-0.66/120P | 220 | 91 | 217 | 129×81 |
| LMK(1,2,3)-0.66/170P | 255 | 60 | 215 | 167×106 |
| LMK(1,2,3)-0.66/220P | 279 | 60 | 184 | 225×57 |
Dimension & outline drawing of LMK-0.66P — click image to zoom / view original.
