Indoor Combined CT/PT Unit
A compact indoor-rated unit combining current and voltage measurement in one cast-resin housing — ideal where panel space is at a premium.
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Medium Voltage Combined CT & PT Unit · 2.2kV–36kV
Medium Voltage Combined CT & PT Units — 2.2kV to 36kV
Cast resin combined current & voltage transformer units for compact MV metering — one housing, one footprint, full metering and protection.
- Single housing combines current and voltage measurement — smaller panel footprint
- Accuracy class 0.2S/0.5S metering and 5P/10P protection on both CT and PT sections
- Maintenance-free cast resin construction, indoor and outdoor variants
- Simplifies metering-panel design and wiring versus separate CT/PT units
Certifications
Certified and Approved For
IEC Compliant Designs
NABL Accredited Lab
ISO 14001:2015
ISO 9001:2015
Technical Specifications
Technical Specifications
Product TypeCast Resin Combined Current & Voltage Transformer
Voltage Range2.2 | 3.3 | 6.6 | 11 | 22 | 33 kV up to 36 kV
Applicable StandardsIEC 61869-1, -2 & -3, IS 2705 & IS 3156
Highest System Voltage (Um)3.6 | 7.2 | 12 | 24 kV up to 36 kV
Rated Primary Current10A to 2000A
Rated Secondary Current1A or 5A
Rated Primary VoltageUn/√3 or Un
Rated Secondary Voltage110/√3 V, 110 V (standard)
CT Accuracy Classes0.2S | 0.5S | 5P | 10P
VT Accuracy Classes0.2 | 0.5 | 3P
Insulation TypeCast Epoxy Resin (bisphenol indoor / cycloaliphatic outdoor)
Insulation Level12/28/60kVp, 24/50/125kVp, 36/70/170kVp
Frequency50Hz / 60Hz
InstallationIndoor or Outdoor
Product Types
Types of Medium Voltage Combined CT & PT Units — 2.2kV to 36kV
Outdoor Combined CT/PT Unit
Cycloaliphatic epoxy construction rated for outdoor exposure, combining metering and protection functions in a single weather-resistant housing.
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Key Features
Key Features of Our Medium Voltage Combined CT & PT Units — 2.2kV to 36kV
Combines current and voltage measurement in a single cast-resin housing
Voltage ratings from 2.2kV up to 36kV
CT accuracy class 0.2S/0.5S metering, 5P/10P protection
VT accuracy class 0.2/0.5 metering, 3P protection
Designed and tested in compliance with IEC 61869-1/-2/-3 and IS 2705/3156
Maintenance-free cast epoxy resin construction — no oil, no periodic top-up
Reduces panel footprint and wiring complexity versus separate CT and PT units
Custom ratios, burdens and terminal arrangements available
Combined CT/PT units let panel builders fit full current and voltage metering into a single footprint, which matters most in compact ring main units and space-constrained switchgear. Straton Electricals builds these to the same accuracy and insulation standards as our standalone CT and VT ranges.
Applications
Applications of Medium Voltage Combined CT & PT Units — 2.2kV to 36kV
Ring Main Units (RMUs)Compact Secondary Substations
Indoor & Outdoor MV SwitchgearIndustrial Power Distribution Panels
Revenue & Energy Metering
Renewable Energy Plants (Solar, Wind)Combined CT/PT units are especially common in ring main units and compact secondary substations, where panel space is limited and a single combined footprint simplifies both mechanical design and secondary wiring.
FAQ
Frequently Asked Questions
A combined CT/PT unit measures both current and voltage from a single housing, saving panel space compared to fitting separate current and voltage transformers.
No — each measuring element is designed and tested to the same accuracy class it would achieve as a standalone unit; combining them into one housing is a mechanical space-saving, not an electrical compromise.
Ring main units (RMUs) and compact secondary substations, where panel space is limited and a combined footprint simplifies both design and wiring.
Yes, in outdoor-rated cycloaliphatic cast resin construction, alongside the standard indoor bisphenol resin version.
The CT section supports class 0.2S/0.5S metering and 5P/10P protection; the VT section supports class 0.2/0.5 metering and 3P protection — configurable per your application.
Talk To Us
Need Help Selecting the Right Combined CT & PT Unit?
Straton Electricals offers customized combined CT & PT solutions for switchgear OEMs, ring main units, and compact secondary substations. Contact our engineering team for technical support and product selection.
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