Low Voltage Instrument Transformer · Up to 1.2kV

Low Voltage Instrument Transformers up to 1.2kV

Low Voltage Instrument Transformers are essential for accurate metering and protection in power distribution systems. These LT instrument transformers include Current Transformer and Potential Transformer configurations that convert high current and voltage into safe, measurable levels for metering and protection devices. Engineered for precision, low-voltage CTs ensure reliable performance in industrial, commercial, and utility applications.

Window, ring and bar-type constructions for every mounting requirement
Accuracy class 0.2S/0.5S metering and 5P/10P protection
Epoxy-resin encapsulated — compact, maintenance-free, long service life
Standard and custom ratios for switchgear, panel and busbar retrofit

Low Voltage Instrument Transformers up to 1.2kV

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Certifications

Certified and Approved For

IEC Compliant Designs

NABL Accredited Lab

ISO 14001:2015

ISO 9001:2015

Technical Specifications

Low Voltage Instrument Transformers: Technical Specifications

Product TypeLow Tension (LT) Current Transformer — Rectangular / Round / Wound Type

Voltage RangeUp to 1.2kV

Applicable StandardsIEC 61869-1, IEC 61869-2, IS 16227-1, IS 16227-2

Rated Primary Current5A to 6000A

Rated Secondary Current1A or 5A

Accuracy Classes0.2S | 0.5S | 0.5 | 1 | 5P | 10P

Burden Ratings2.5 VA to 15 VA, or customer-specified

Insulation TypeEpoxy Cast Resin

Frequency50Hz / 60Hz

Short-Time Thermal CurrentUp to 50 x In for 1 second

InstallationIndoor Panel-Mount

Mounting TypeBus-bar, cable-window, or bolted bar-primary

Product Types

Low Voltage Instrument Transformers — Rectangular, Round, and Wound Types

Straton Electricals manufactures low voltage current transformers and LT instrument transformers that step down high currents to safe, measurable levels for accurate metering and protection up to 1.2kV. Available as rectangular, round, and wound types, these low-voltage CTs are encapsulated in epoxy resin and manufactured in compliance with IEC 61869-1 and IEC 61869-2. They are widely used across power distribution systems for accurate current measurement and protection.

Wound Type Current Transformer

Primary winding wound around the core for precise, stable metering and protection performance in LT panel and switchgear applications.

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Ring Type Current Transformer

A ring-shaped CT that slips directly over an existing cable or bus-bar without a dedicated primary winding — the simplest option for panel retrofits and new installations alike.

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Rectangular Current Transformer

A compact rectangular-window construction suited to busbar and panel-mount installations where a low profile matters as much as accuracy.

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Key Features

Low Voltage Instrument Transformer: Key Features

Extended long service life with high reliability across all low voltage instrument transformers

Customised transformer solutions backed by in-house transformer design engineering expertise

Suitable for both indoor current transformers and outdoor current transformers installations

Unique dry type construction with epoxy resin encapsulation for superior electrical insulation

Precise electrical metering and power system protection across all operating conditions

Complete current transformer and voltage transformer range up to 1.2kV

Up to 5-year warranty across all low voltage instrument transformer products

Applications

Low Voltage Instrument Transformers: Applications

Control panels, drives, and electrical switchboard installations

Electrical switchgear for accurate current and voltage measurement

Metering systems, including commercial energy sub-metering systems

Low-voltage motor control centres

Distribution panel protection against overload and short-circuit conditions

Ground fault detection in low-voltage networks

Voltage metering, control, and protection for indoor switchgear installations

Monitoring and control of lighting and HVAC systems

FAQ

Frequently Asked Questions

Who are the leading low voltage instrument transformer manufacturers in India?

Straton Electricals is a trusted low voltage instrument transformer manufacturer in India, ISO 9001:2015 certified, supplying current transformers and voltage transformers to power utilities, DISCOMs, and industrial sectors. With in-house testing, custom engineering capability, and CPRI/ERDA approvals, Straton Electricals delivers reliable LV instrument transformers for metering and protection applications.

What are the common applications of Current Transformers (CT) and Potential Transformers (PT)?

Current Transformers (CT) are used in metering, protection, and control panels, drives, motor control centres, switchboards, and ground fault detection. Potential Transformers (PT) are used for voltage metering, control, and protection in substations, switchgear panels and distribution networks.

What standards should Low Voltage Instrument Transformers comply with?

Straton Electricals' low voltage instrument transformers comply with IEC 61869-1 and IEC 61869-2, and IS 16227-1 and IS 16227-2, manufactured under an ISO 9001:2015 certified quality management system.

How to select the right class of CT or PT for metering or protection?

Select the CT or PT accuracy class based on your application. For revenue metering, use accuracy class 0.2S or 0.5S with a suitable VA burden. For protection, use class 5P or 10P with the correct CT ratio or PT ratio matched to your relay and switchgear specifications. Contact Straton Electricals' engineering team for CT and PT selection support.

What is the difference between a current transformer and a potential transformer?

A current transformer (CT) steps down high primary current to a standardised 1A or 5A secondary output for metering, protection, and monitoring. A potential transformer (PT), also called a voltage transformer (VT), steps down high voltage to standardised secondary voltage levels for voltage measurement and protection. Both are instrument transformers used together in switchgear panels, substations, and distribution networks for accurate power system monitoring.

What is the lifespan of a low-voltage instrument transformer?

LV instrument transformers from Straton Electricals are designed for a service life of 25–30 years under normal operating conditions. Epoxy resin encapsulation protects against moisture ingress, thermal ageing, and insulation degradation, ensuring long-term reliability with minimal maintenance. Dry-type resin cast construction eliminates the need for oil handling, making these transformers maintenance free across their operational life.

Are low-voltage instrument transformers used in renewable energy systems?

Yes, low voltage instrument transformers are widely used in renewable energy systems including solar power plants and wind energy installations. They support accurate electrical monitoring, revenue metering, and protection, ensuring efficient power management, grid synchronisation, and reliable energy measurement in solar inverter panels, wind turbine control systems, and grid interconnection points.

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Need Low Voltage Instrument Transformers for your application?

Straton Electricals offers customized low voltage current transformer solutions for panel builders, OEMs, and industrial distribution systems. Contact our engineering team for technical support, product selection, and customised CT specifications.

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