LMZJ1 Current Transformer for Low Voltage Panels
Engineering Intent
LMZJ1 current transformers are used in low-voltage panels for feeder metering, power monitoring and protection signal input.
This article is written for engineers, EPC buyers and procurement teams who need to turn LMZJ1 CT for LV switchgear into a clear technical request instead of a vague product inquiry.
Key Selection Data
| Item | Data to Confirm |
|---|---|
| Check 1 | LV feeder current |
| Check 2 | Busbar or cable dimensions |
| Check 3 | Secondary current |
| Check 4 | Meter or monitoring device burden |
Standards and Evidence to Request
- IEC 61869
- IEC 61439 LV panel interface
- Panel wiring diagram
For project approval, request a technical datasheet, outline drawing, wiring or terminal diagram where applicable, routine test report and nameplate information before shipment.
Common Specification Mistakes
- CT window too small for busbar
- No secondary current specified
- No meter burden checked
RFQ Checklist
- Provide busbar or cable size
- Confirm current ratio
- State accuracy class
- Share panel drawing
Related Product Paths
Ziyao Power can review the single-line diagram, load schedule, panel drawing or tender sheet and convert the requirement into a practical quotation package.
Download This Guide as PDF
Save this technical guide for offline reference. Includes all tables, specifications, and contact information.
Related Articles
Current Transformer Ratio Selection Guide
CT ratio should match feeder current, meter or relay input, accuracy requirement and future load margin.
CT Accuracy Class 0.5 vs 5P Explained
Metering CTs and protection CTs use different accuracy classes, so 0.5 and 5P should not be treated as interchangeable.
Current Transformer Burden Calculation
CT burden must include meter or relay load plus secondary cable resistance to maintain accuracy.