Voltage class
01Up to 36 kV
Indoor resin cast class
Indoor Instrument Transformers
Resin CastCurrent Transformers
INDULF manufactures indoor resin cast current transformers up to 36 kV for protection, metering and switchgear applications. Produced through APG casting with high-grade epoxy resin, these transformers combine precision electrical performance with a robust, compact insulation system built for long-term indoor & outdoor service.
Voltage class
Up to 36 kV
Process
APG cast
Resin cast CT configurations
Built to match your switchgear requirements
From metering and protection to specialized current-sensing configurations, our resin cast CTs are manufactured to suit the electrical and installation requirements of each application.
Metering CTMetering CTHigh-accuracy 0.2 / 0.2S cores for revenue, boundary, and feeder metering points.
Protection CTProtection CT5P / 10P protection cores sized to the knee-point voltage and burden your relay coordination requires.
Ring / Window-type CTRing / Window-type CTA core with no primary winding of its own: the busbar or cable passes straight through the window, suited to compact panel integration.Bar-primary CTBar-primary CTA fixed bar primary cast into the unit, for panel positions with a defined busbar interface and current rating.
Wound-primary CTWound-primary CTA multi-turn primary winding for low-current ratios where a single busbar pass wouldn't give the core enough ampere-turns.Core-Balance CT (CBCT)Core-Balance CT (CBCT)A ring core sized around all phase conductors together, sensing the residual current for earth-fault protection.Overview
Engineered for the demands of industry
INDULF manufactures indoor resin cast current transformers up to 36 kV, combining application-focused engineering with controlled manufacturing to deliver consistent electrical performance. Each transformer is developed around the required configuration and manufactured with close attention to dimensional accuracy, insulation integrity and overall build quality.
Manufactured using Automatic Pressure Gelation (APG) technology and high-grade hydrophobic epoxy resin, each transformer is cast to create a dense and reliable insulation system. The resin-cast construction provides strong resistance to tracking, moisture and environmental ageing, while supporting dependable long-term performance in demanding indoor installations.
Quality is embedded throughout our manufacturing process, from material and component inspection to winding, casting, assembly and final testing. Every transformer undergoes defined routine testing before dispatch, supported by serial-number-specific documentation for verification and traceability. Our growing presence across India and international markets reflects our ability to consistently deliver products that meet demanding technical, quality and project requirements — strengthening INDULF's position as a dependable manufacturing partner for the power industry.
Technical capability
Built around your application requirements
Key electrical, accuracy, construction and compliance parameters across our resin cast current transformer range.
Primary current
02Up to 2000 A
Application-specific primary ratings
Rated burden
03As Per Requirement
Configured to the application
Accuracy class
040.1 / 0.2 / 0.2S / 0.5 / 0.5S / 1 / 3 / 5
Metering & protection classes
Core
05Metering / Protection / Multi-core
Single or multi-core configuration
Standards
06As per IEC 61869, IEC 60044, ANSI/IEEE
Designed and tested to applicable standards
Why INDULF
From manufacturing to final testing, we control the process
Every INDULF transformer reflects controlled manufacturing, rigorous testing and a commitment to consistent quality and dependable performance.
- 01
CONTROLLED MANUFACTURING
Our instrument transformers are manufactured with controlled processes for winding, insulation, assembly and finishing, maintaining consistency from production through final inspection.
- 02
APPLICATION-LED ENGINEERING
Each transformer is configured around the required ratio, accuracy class, burden, insulation level and core arrangement for its intended protection or metering application.
- 03
IN-HOUSE TESTING
Every transformer is subjected to defined routine checks before dispatch through our in-house NABL-accredited testing facility.
- 04
QUALITY AT EVERY STAGE
Quality is maintained through defined inspection and control processes across materials, manufacturing, assembly and final inspection.
Applications
Where our CTs deliver value
UTILITY & DISCOM METERING
Revenue, boundary and feeder metering across utility distribution substations.
INDUSTRIAL SWITCHGEAR
Protection and metering applications within factory, plant and industrial HT switchboards.
EPC & SWITCHYARD PROJECTS
Application-specific CTs supplied for contractor-led switchyard, substation and infrastructure projects.
FEEDER & EARTH-FAULT PROTECTION
Protection-class and core-balance CTs for feeder protection and earth-fault detection systems.
Find the right instrument transformer
Current sideOutdoor Current TransformersExplore
Voltage sideOutdoor Potential TransformersExplore
Indoor voltageResin Cast Potential TransformersExplore
Combined unitCT-PT Metering UnitExploreExplore More from INDULF
Next step
Let's build the right CT for your application
Share your project requirement, specification or drawing with our team. We'll review the application, confirm the right configuration and take it through manufacturing, testing and delivery.
01
SHARE YOUR REQUIREMENT
Send your specification, drawing, project details or existing transformer details.
02
TECHNICAL REVIEW
Our team reviews the application and confirms the appropriate transformer configuration and requirements.
03
BUILT, TESTED & DELIVERED
Your transformer is manufactured, tested and prepared with the required quality and technical documentation for delivery.