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Add : Room 701, Building A1, No. 55 Runfa Road, Jiangning District, Nanjing, China
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The EI187 Line Frequency Current Sense Transformer is designed for accurate AC current measurement, monitoring, and protection in industrial and power distribution systems. Built with a high-quality EI187 laminated core and precision winding technology, it ensures stable current sensing performance and reliable signal output under line-frequency conditions.
This transformer is widely used in power monitoring systems, industrial automation, energy management equipment, and electrical protection circuits. It provides safe electrical isolation between primary high-current circuits and secondary measurement/control systems.
Custom turns ratios, sensing ranges, and mounting configurations are available to meet different application requirements.
Accurate AC current sensing and monitoring
Designed for line frequency (50/60Hz) applications
Reliable electrical isolation between primary and secondary sides
Low phase error and stable signal output
High safety and long-term operational reliability
Suitable for industrial power systems
Customizable sensing parameters available
AC Current Monitoring Systems
Industrial Power Distribution Equipment
Energy Management Systems (EMS)
Electrical Protection Circuits
Smart Metering Devices
Industrial Automation Systems
Power Control Panels
Physical Propertie
| Order Code | L (mH) | n | lR (A) | ∫Udt (Vμs) | VT (V(AC)) | RDC1 max. (mΩ) | RDC2 max. (Ω) |
| INF-EI187-400mH | 400 | 1:500 | 45 | 30000 | 4000 | 0.27 | 16.2 |
| INF-El187-1600mH | 1600 | 1:1000 | 45 | 60000 | 4000 | 0.27 | 78.7 |
| INF-EI187-3600mH | 3600 | 1:1500 | 45 | 90000 | 4000 | 0.27 | 178 |
| INF-E187-6400mH | 6400 | 1:2000 | 45 | 120000 | 4000 | 0.27 | 317 |
| INF-EI187-10000mH | 10000 | 1:2500 | 45 | 150000 | 4000 | 0.27 | 468 |
| INF-EI187-14400mH | 14400 | 1:3000 | 45 | 180000 | 4000 | 0.27 | 747 |
Technical Specifications
| Main Category | Subcategory | Details |
| MOQ | Prototyping & Small-batch | 10 piece minimum order |
| Sample Service | Free proofing & custom service, 5 free samples (shipping at buyer’s cost) | |
| Bulk Order | 5,000 pieces and above with bulk pricing | |
| Lead Time | All Standard Components | Shipped within 5–7 working days |
| Custom Inductance / Pin Design (Sample) | Sample order confirmed within 5–7 working days | |
| Custom Inductance / Pin Design (Mass Order) | Shipped within 15–30 working days | |
| Payment Terms | Main Payment Term | T/T in advance, L/C at sight |
| Procurement Standard | Complies with global enterprise procurement standard for passive components | |
| Quality Deposit | No quality security deposit required | |
| Accepted Terms | FOB Shanghai / Nanjing / Hong Kong, T/T Advance | |
| Quality Assurance | Manufacturing Defects | Free replacement for issues caused by manufacturing defects |
| Inspection Report | Batch inspection reports available as certification upon customer request | |
| Packaging Specifications | Updated Packaging (2026) | Blister tray packaging; Sealed Tape & Reel for SMD products |
| Optional Packaging | Vacuum sealed packaging for customers with strict moisture-proof requirements |
