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Power‑measurement accuracy, compliance, and cost‑efficiency are critical for Purchasing Managers, Technical Directors, and Operations Leaders in the USA.
Both devices are magnetic transducers, but a Current Transformer (CT) measures line current by producing a proportional secondary current, while a Voltage Transformer (VT) (or Potential Transformer) steps down line voltage to a safe, measurable level.
| Feature | Current Transformer (CT) | Voltage Transformer (VT) |
|---|---|---|
| Primary | Current‑carrying conductor (bus bar, cable) | Voltage source (line, transformer secondary) |
| Secondary Output | Current (e.g., 5 A or 1 A) | Voltage (e.g., 100 V, 110 V) |
| Typical Accuracy Class | 0.2 % – 1 % | 0.1 % – 0.5 % |
| Burden (VA) | ≤5 VA (standard), up to 30 VA for high‑end | ≤10 VA (standard), up to 50 VA for precision |
| Common Ratios | 100 A/5 A, 200 A/5 A, 400 A/1 A | 10 kV/100 V, 33 kV/110 V |
Micro‑CTA: Find the exact model that fits your spec.
| Parameter | Current Transformer (CT) | Voltage Transformer (VT) |
|---|---|---|
| Primary Rating | 30 A ~ 800 A | 1 kV ~ 35 kV |
| Secondary Rating | 5 A or 1 A | 100 V or 110 V |
| Accuracy Class | 0.2 % (Class 0.2), 0.5 % (Class 0.5) | 0.1 % (Class 0.1), 0.2 % (Class 0.2) |
| Temperature Range | -40 °C ~ +85 °C | -30 °C ~ +70 °C |
| IP Rating | IP20‑IP68 (customizable) | IP20‑IP65 (customizable) |
▶ Download Full Spec Sheet (PDF)
Micro‑CTA: Start Your Custom Project Now
A CT steps down high line current to a safe secondary current (5 A or 1 A) for metering and protection, while a VT steps down line voltage to a low, measurable voltage (100 V‑110 V) for voltage‑sensitive devices.
Calculate the maximum primary current (or voltage) you expect, then select a ratio that keeps the secondary within the rated 5 A (CT) or 110 V (VT) limit. Xinchangda offers a 1‑click ratio calculator in the client portal.
No. CTs and VTs are optimized for different magnetic flux levels; using the wrong type leads to inaccurate readings and possible safety hazards.
Standard OEM: 2‑4 weeks after design approval. Rush orders (additional fee) can be shipped within 10 business days.
Yes. Every batch ships with a calibrated test report (±0.2 % accuracy) and a traceable certificate to national standards.
We support FOB, CIF, DDP, and air‑freight. Our US‑based warehouse in Los Angeles offers same‑day dispatch for stocked items.
Micro‑CTA: Contact our logistics specialist now.
Limited‑time Offer: Free 1‑year calibration service for orders placed before 31 May 2026. Only 150 units left at the promotional price.
Or call us directly: +86 131 2825 6415 / +86 0752‑3388753
Mike T., Procurement Lead, SolarTech USA – “Xinchangda’s CTs cut our metering cost by 22% while meeting UL‑758. The free sample convinced us instantly.”
Sarah K., Electrical Engineer, Atlantic Power – “The VT series delivered with 0.1 % accuracy right out of the box – zero field adjustments needed.”
David L., Supply Chain Manager, Midwest Energy – “Fast‑track OEM took only 10 days. Our project stayed on schedule and under budget.”
Emily Chen, Ph.D. – Senior Magnetics Engineer & Content Strategist at Huizhou Xinchangda Electronic. With 12 years of R&D experience in IEC‑compliant transformer design and a background in B2B technical marketing, Emily bridges engineering precision with decision‑maker‑focused communication.
Contact: grace01@xcdmagnetic.com | Phone: +86 131 2825 6415
4. Real‑World Success Stories
Certificates & Compliance: CE, UL, IEC 61869‑2, RoHS, ISO 9001, VDE, GS, FCC, CB, IPPC.
Micro‑CTA: Lock in your compliant solution today.