2 product lines
Current Transformers
Current transformer families for protection, metering, and panel integration.
Back to products
Metering and Protection
Instrument Transformers for Metering and Protection Circuits
Current transformers and voltage transformers for switchgear panels, metering systems, relay protection and power monitoring.
Product Functions
Organized by Product Function
1 product lines
Voltage Transformers
Voltage transformer families for metering, indication, and protection circuits.
Instrument Transformer Guides
CT Guides, VT Guides and Product Links
Current transformer and voltage transformer pages connect ratio, burden, accuracy class, insulation level and switchgear integration.
CT Guides
VT Guides
Product Links
Product Options
Available Product Lines
LZZBJ9-12
LZZBJ9-12 Current Transformer
Cast-resin CT platform for MV switchgear.
View product lineLMZJ1 / LVB
LMZJ1 / LVB Current Transformer
Low-voltage and cast-resin CT families for metering and protection.
View product lineJDZ(X)
JDZ(X) Voltage Transformer
Cast-resin VT platform for switchgear and metering.
View product lineEngineering Value
Built Around Real Project Requirements
Instrument transformers isolate and scale primary current or voltage for meters, relays and monitoring devices. Correct selection depends on ratio, accuracy class, burden, insulation level, installation space and the number of measuring or protection cores required.
CT and VT coordination
Current and voltage transformer selections can be matched to meters, relays and switchgear drawings.
Accuracy-based selection
Metering and protection applications can be separated by accuracy class, burden and core configuration.
Panel integration support
Outline dimensions, mounting method and terminal layout can be checked for switchgear cabinet integration.
Applications
Where This Product System Is Used
MV switchgear panels
CT and VT sets for protection relays, metering, voltage indication and interlock circuits.
LV metering systems
Low-voltage current transformers for energy measurement and monitoring panels.
Utility metering points
Instrument transformer selections for revenue metering and distribution monitoring.
Industrial power systems
Measurement and protection transformer products for plant distribution equipment.
Procurement Support
What to Confirm Before Quotation
A clear technical request helps us recommend the right configuration, prepare drawings faster and avoid repeated clarification during procurement.
Buyer Checklist
Primary and secondary ratio
Accuracy class and burden
Metering core, protection core or combined requirement
Rated insulation level and frequency
Indoor, outdoor or panel-mounted installation
Mounting dimensions and terminal arrangement
Technical FAQ
Common Buyer Questions
How do buyers select a current transformer ratio?
The ratio should match the expected primary current and the meter or relay input. It should allow normal operating current to be measured accurately while still supporting protection requirements.
Are metering CTs and protection CTs the same?
They are often different. Metering CTs prioritize accuracy in normal load ranges, while protection CTs must remain reliable during fault conditions. Some projects use separate cores for each function.
What details are needed for instrument transformer selection?
Ratio, accuracy class, burden, insulation level, installation method, panel dimensions and connected meter or relay requirements should be confirmed.
Send Your Specs
Get a Project-Matched Recommendation
Share the basic electrical and site requirements for Instrument Transformers. Our team will review the fit, suggest the right product line and prepare quotation-ready follow-up.
What to Send
Rated voltage and frequency
Capacity, current or feeder quantity
Indoor / outdoor installation site
Destination country and quantity
Related Downloads
Datasheets and Catalog Files
Use these files for early supplier screening, then send voltage, rating, quantity and destination country for a project-specific quotation.
Approved Download Center
Latest CEO-approved product datasheets and catalogs. Legacy catalog files have been replaced.
YB / ZGS11 Compact Substation Catalog
Compact substation package reference for MV-transformer-LV projects.
SCB13 Dry-Type Transformer Datasheet
Dry-type transformer parameters and selection reference.
S13-M Oil-Immersed Transformer Datasheet
Oil-immersed transformer RFQ and utility distribution reference.
Send Inquiry
Ask for drawings, lead time and quotation support.