The ACST11 series protection-grade current transformer adopts a split bobbin (divided frame) design, providing excellent insulation performance and a dielectric strength of up to 3000 Vrms. It is suitable for applications such as protective current monitoring, test protection systems, and electrochemical monitoring.
This current transformer complies with UL-certified Class B insulation system standards, ensuring safe and reliable operation in industrial environments. Its compact structure allows easy integration into space-constrained equipment.
The ACST11 series offers multiple turns ratio options ranging from 100 to 1500 turns, with a secondary inductance range of 40 mH to 6800 mH, and a maximum primary current rating from 12 A to 300 A, enabling flexible adaptation to various current sensing and measurement requirements.
UL Class B insulation – High thermal endurance, reliable performance
Dielectric strength 3000Vrms – Excellent safety isolation
Split bobbin design – Enhanced insulation, superior safety
Compact package – Saves PCB space
Turn ratio range – 100T to 1500T
Secondary inductance – 40mH to 6800mH
Max primary current – 12A to 300A
| Part Number | Turns Ratio | Sec Inductance Ls (mH) | DCR Rs (Ω) Max | Pri Current (A) Max | Sec Wire Dia (mm) |
|---|---|---|---|---|---|
| ACST11-101 | 100 | 40.0 | 1.1 | 300 | 0.25 |
| ACST11-151 | 150 | 90.0 | 2.0 | 280 | 0.23 |
| ACST11-201 | 200 | 160 | 3.5 | 270 | 0.20 |
| ACST11-301 | 300 | 360 | 7.5 | 250 | 0.17 |
| ACST11-501 | 500 | 750 | 19 | 190 | 0.14 |
| ACST11-701 | 700 | 1500 | 47 | 130 | 0.10 |
| ACST11-102 | 1000 | 3000 | 104 | 120 | 0.08 |
| ACST11-152 | 1500 | 6800 | 230 | 100 | 0.06 |
Protection current monitoring – Overcurrent protection in power systems
Testing protection systems – Relay protection device testing
Electrochemical monitoring – Current detection in electrochemical processes
Industrial control equipment – Motor protection and condition monitoring
Power supply systems – Switching power supply current sensing
Q: What is the insulation rating of the ACST11 series current transformer?
A: The ACST11 series complies with the UL-certified Class B insulation system (thermal rating 130°C) and offers a dielectric strength of up to 3000 Vrms, ensuring high safety and reliability in demanding applications.
Q: What are the advantages of the split bobbin design?
A: The split bobbin structure improves primary-to-secondary insulation separation, enhancing withstand voltage capability. It also simplifies winding processes, which helps reduce manufacturing complexity and overall production cost.
Q: How do I select the appropriate turns ratio model?
A: Selection should be based on the maximum primary current of the application. For example, if the maximum current is 200 A, it is recommended to choose ACST11-201 (rated up to 270 A) to ensure sufficient design margin and reliable operation.