When you go for the costing of a current transformer (CT) you might end up with answers that differ from $5 to $3000 which are all true based on the product! A current transformer is a small metal piece composed of iron and copper which is placed over the conductor and reduces the current to an understandable and measurable number (1A or 5A in the output). Therefore, there is a certain price range based on what the CT does: $5 CT which is used for measuring current in panel meters at various workshops, $50 CT used for commercial energy metering application, $300 CT which might be used in a 15kV switchgear protection system, and then there are the expensive CTs, ($1000+) used for high precision utility revenue metering system. The difference is not just by chance but it depends on primary current rating, accuracy class, insulation voltage, core design and manufacturer.
In this guide you will find realistic possible ranges for the current transformer price as per its type and specification, and the additional expenses involved (installation, testing, customization) along with the answers to frequently asked questions about current transformers.
The price of a current transformer can range anywhere from $500 to $3,000 or up depending on factors including; type of current transformer and its accuracy, insulation class, etc. Looking at some reasonable price ranges; a low voltage metering CT would cost only $5-50 which is the average price of the traditional Chinese manufacturer. On the other hand, the similar low-voltage CTs will cost $50-$200 from the large manufacturers such as Siemens SENTRON, ABB or Schneider. The cost of split-core CT lies in a range of $40 to $350 while the price of medium voltage CT used for switchgear protection ranges between $300 and $1,500. The cost of hi-precision revenue CT varies from $500 to $3,000 adding some extra expenditures associated with the installation, testing and calibration.
The Bottom Line: CT Price Ranges
Referring to the catalogs created by manufacturers, lists established by wholesalers, and export price information:
| CT Type / Application | Typical Price (USD) |
|---|---|
| Low-voltage ring CT, 0.66 kV, 50/5-3000/5, class 0.5 (factory-direct) | $5-50 (catalog ¥7-61) |
| Low-voltage CT, major brand (Siemens SENTRON, ABB, Schneider) | $50-200 |
| Split-core (clamp-on) CT, retrofit without disconnect | $40-350 |
| Bar-type CT, low voltage, higher current (1000-5000/5) | $30-150 |
| Medium-voltage CT, 15 kV class, epoxy insulated | $300-800 |
| Medium-voltage CT, 33 kV class, protection/metering | $500-1,500 |
| High-accuracy CT (0.2/0.2S, revenue metering, utility grade) | $500-3,000+ |
The planning costs for almost all types of industrial and commercial panels: $20-100 for a low-voltage current transformer and $300-1,000 for a medium-voltage current transformer with the price depending on the quality and brand of the transformer.
Price by Type: Ring, Bar, Wound, Split-Core
The market provides four different types of devices that can be considered as different types of physical design, each of which has its own particular logic and the manner of determining the price:
- Ring or window CT is the device that has the core with a hole in it through which the conductor is run; this type of CT is known to be the cheapest and most commonly applied type for low voltage applications. Price ranges between $5-50 which is determined by the size of the hole (30-120 mm) as well as due to the current load and accuracy growing.
- Bar CT – this type of device has some bar, which passes through the CT core; this equipment is used for very high current loads and has its own mechanical load.
Price may range between $30-150 for low voltage applications and higher for medium voltage applications. - Wound-primary CT – the wire is wound on the CT core and acts as primary for low current loads when one passage is not enough for taking the signal.
- Split-core CT -this type of device is characterized by the fact that it has a core that can be separated or split in order to apply this device to a conductor of an already mounted equipment without disconnecting it.
For new design applications it seems reasonable to apply a ring CT, while for the existing one the split-core option would be more suitable.The full product family — ring, bar, and split-core, with the accuracy classes that matter for each job — is on our current transformer page.
Price by Specification: Ratio, Accuracy, Insulation
Three specifications determining the price are mentioned below:
- A current and its ratio. Bigger currents like 1000/5, 2000/5, and 5000/5 mean bigger cores of transformers. For instance, with CT 3000/5 which belongs to this category, price is 2-4 times as big as with CT of 100/5 electrical parameters (there is detailed information on this in the catalogs with prices from ¥ 7 to ¥ 35, depending on the current, by the way).
- The accuracy class. The classification of metering CT is made in classes based on their accuracy, e.g. 0.5, 0.2, 0.2s (for revenue metering). The price can differ for 30-100% between 0.5 and 0.2 classes. Only CTs of 0.2s class are sold for high money because they show an appropriate level of accuracy of the metering CT. Higher accuracy means that the company will pay as much as required, whereas the lower accuracy means that the device costs less. Find definition of accuracy class in our guide.
- The insulation voltage class. Low-voltage CTs are made of plastic and are very cheap. Medium-voltage device is made of the epoxy resin and oil-containing core which has a bushings made specifically for it according to the state requirements.
Price by Brand and Manufacturer
CT brand positioning mirrors that of electrical devices worldwide.
| Brand Tier | Examples | Typical Price Positioning |
|---|---|---|
| Factory-direct Chinese | Regional CT plants (BH-0.66 series etc.) | $5-50 for LV; the global price floor |
| Export Chinese / mid-tier Asian | Export-focused CT makers with IEC/CE marks | $20-120 for LV; $100-400 for MV basics |
| Major international brands | Siemens (SENTRON), ABB, Schneider, Mitsubishi, GE | $50-200 LV; $400-1,500 MV; full certification and global support |
| Specialist instrument transformer makers | Instrument Transformers Inc., Trench, Arteche, Pfiffner | $500-3,000+ for high-accuracy and high-voltage classes |
Taking the example of Siemens SENTRON 500:5 CT (a conventional low voltage metering device) that costs around $95, which is about 10 to 20 times the price of standard CTs – the high price guarantees its accuracy, quality assurance, certified installation, and utility contracts. Standard CTs can be used for non-critical measurement purposes while certified CTs are the best option for revenue measurement.Our instrument transformer range covers the certified options across the accuracy classes that billing applications demand.
The Extra Costs: Installation, Testing, Customization
The device’s cost is often less than half the costs incurred at a metering site.
- Installation: low-voltage CTs can be attached to wires or affixed on the panel busbar – this requires just an electrician charging $50 – $150 per hour. The installation of medium-voltage CTs involves placing them inside the switchgear, thus calling for a qualified team, outage management, and often shutdown of the facility with the expense incurred ranging from $500 – $3000 depending on the kind of switchgear and its accessibility.The installation rules and common pitfalls are covered in our CT installation guide.
- Testing and calibration signify an expense of anywhere between $50 to $500 per CT to confirm the ratio and accuracy (and including the calibration certificate if applicable for revenue CTs), where the calibration done at an accredited laboratory represents the cost of testing at the highest end of the range, adding cost between $50 to $500 per CT.
- Secondary wiring and ancillary items: Secondary wiring CTs (and its respective shorting blocks and testing switches) add approximately $50 to $300 per item — it is important to remember that while using a CT, one should never open the CT’s secondary circuits, thus there is a necessity to terminate the CT with appropriate connectors and hardware.
- Custom changes: Custom price customizations would involve the costs rising by around 10 to 50% of the base price of the CT due to custom ratio, custom accuracy classes, custom dimensions of the windows for CTs operation in corrosive environment.
How to Buy Smart: Getting the Right CT for the Price
- Distribution of tasks: metering (billing) requires certification to be precise, therefore one should budget properly; monitoring (trending, efficiency) can be done without such a precision, but don’t waste too much; protection requires CT saturation class (5P10/10P10 type) to be compatible with a relay–our protection CT manual will advise you on the matter.
- Choosing proper shunt size: primary rate should be between 1.2 to 1.5 of load current as operating with oversized CT produces wrong results at low load.
- Cost calculation: don’t forget to include transport costs and certification when dealing with cross-border purchases.
- Avoid purchasing split-core devices unless it is absolutely necessary: modern distribution boards with ring CTs don’t need split-core CT.
- Combine accessory purchasing: short circuit blocks and controlling switches will be cheaper if purchased together with CTs.
Frequently Asked Questions
What is the average cost of a transformer?
The price of a transformer varies according to the kind of transformer used. In the case of current transformers used for measuring or protection of the conduction entities, the price can vary from $5 to $200 for low power transformers and from $300 up to $1,500 for medium voltage transformers. As for the power or distribution transformers changing the voltage, the average price will actually be from $1,600 to $7,000 for 100 kVA transformers. The price of transformers increases along with the increase in the power: for example, $4,200 to $7,800 for 500 kVA transformers or $7,500 to $13,500 for 1000 kVA transformers and even six-digit numbers for more powerful transformers. It should be noted that both the supplier and the customer should refer to the same kind of transformer being bought.
How much does a 200 kW transformer cost?
In the case of 200 kW of the transformer, it is advisable to speak about 250 kVA. When we are talking about oil immersed transformers, $2,400 to $4,000 should be assumed depending on whether the transformer is to be supplied by any cost saving/supplier or the certified western companies.
How much does a 400 kW transformer cost?
When 400 kW is expected from the transformer, its power should be 500 kVA. It has to be noted that with oil type transformers the number can be between $4,200 and $6,200, while with dry type transformers the cost will be even higher. The price of the factory-direct manufacturers is between $8,000 and $15,000 which has to be followed by the extra 20-40% of the total cost, etc. All the mentioned prices are still effective for the prices on the market in 2025-2026.
How much is the current price of a transformer?
Nowadays the price of the transformers are dictated by the amount of copper and silicon-steel for the company where the good transformers can be sold starting from $5 and up to $1,500 depending on the applied technology and level of efficiency.
References
- Yiwugo — BH-0.66 current transformer series pricing (factory-direct)
- ECER — Split-core and medium-voltage CT pricing references
- RS Online — Siemens SENTRON 500:5 current transformer (brand pricing)
- Machinio — New and used current transformer listings
- Unita Transformer — 2026 transformer price ranges by kVA
Conclusion
The price range of current transformers ranges from $5 to $3,000 depending primarily on the insulation voltage class (the most significant factor) as well as the accuracy class (the second most significant factor) followed by the current rating capacity and manufacturer. For low-voltage application current transformer prices are between $20 and $100 but direct purchase prices can be as low as $5 and retailers sell them at around $50 up to $200. For medium-voltage switchgear the price ranges from $300 to $1,500 for both the device and the certificate. The cost of a utility-grade metering instrument can be from $500 up to $3,000 and more depending on how accurate the water and gas consumption readings are.