The SCTK663 series split-core current transformer is designed for retrofit installation needs in existing power distribution networks. The product uses a split-core structure that allows quick installation without disconnecting or removing cables or busbars. It is secured with cable ties for reliable and firm fixing, significantly reducing labour installation costs. Two window sizes are available: 25mm and 45mm, suitable for different cable diameter requirements. It is widely used in HVAC temperature control, power management, building automation systems, motor current measurement, lighting, and air conditioning equipment current monitoring.
Features
- Measuring range – 5A-1000A
- Output signal – 0-10V or 0-5A
- Window size – 25mm / 45mm (optional)
- Split-core structure – no cable removal required
- Cable tie fixing – secure and reliable
- Compatible with HVAC temperature control
- Suitable for power management and building automation
- Saves labour installation costs
Applications
- HVAC temperature control systems
- Power management
- Building automation systems
- Motor current measurement
- Lighting system current monitoring
- Air conditioning equipment current monitoring
- Power distribution systems
- Retrofit projects (online installation)
Electrical Parameter
| Frequency |
50-400Hz |
| Rated Input |
5A-1000A |
| Measuring range |
5%In-130%In |
| Rated Output |
0-10V(AC) or 0-5A |
| Ratio |
≤ ± 0.2% |
| Phase angle |
≤ ±10min |
| Dielectric strength |
2.5KV/1mA/1min |
| Insulation Resistance |
DC500V/100MΩmi |
Mechanical Parameter
| Case |
PC /UL94-V0 |
| Bobbin |
PBT |
| Internal structure |
Epoxy |
| Construction |
Tie |
| Operating Temp |
－25℃～＋75℃ |
| Operating Humidity |
≤85% |
| Output Connection |
UL1015 22AWG Wire(twinsted wire) 2.5m |
Wire Gauge: It is much better to oversize your CT than to undersize it. Please measure your wire diameter in millimeters, rather than use the MCM wire size because the insulation thickness varies materially from one wire manufacturer to the next.
Type selection
| P/N |
Rated Input (A) |
Output (mA/V) |
Accuracy |
Dimensions(mm) |
|
|
|
|
Φ |
A |
B |
C |
D |
E |
| SCTK663A-025 |
5-400A
(5,100,250,400A)
|
0-200mA
0-10V
|
0.2,0.5,1.0 |
25 |
118 |
90 |
42 |
16 |
32 |
| SCTK663B-045 |
50-1000A
(50,250,400,1000A)
|
0-500mA
0-10V
|
0.2,0.5,1.0 |
45 |
145 |
113 |
42 |
16 |
32 |
Notes: Product specifications can be customized
FAQ
Q: How to choose between 25mm and 45mm windows?
A: The 25mm window is suitable for smaller cables (outer diameter ≤25mm). The 45mm window is suitable for larger cables or busbars (outer diameter ≤45mm). When selecting, please choose the appropriate window size based on the outer diameter of the cable under test.
Q: How to choose between 0-10V and 0-5A outputs?
A: 0-10V output is suitable for control systems that require voltage signals (such as PLC, DCS, building controllers). 0-5A output is suitable for traditional current-input measurement instruments and protection devices. Please choose based on your equipment input interface.
Q: What are the advantages of cable tie fixing?
A: Cable tie fixing requires no special tools, making installation simple and quick. It ensures the transformer is securely fixed on the cable and will not shift due to vibration or external forces. It is suitable for batch installation and on-site construction.
