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China CT3 Series Current Transformers - Reliable Power Monitoring Solutions from Top Suppliers & Factory
Product Overview
A CT operates on electromagnetic induction and has two windings: a primary winding with a few turns linked in series to the high-current circuit, and a secondary winding with many turns connected to safety or measurement devices.
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The primary winding receives a significant current, whereas the secondary winding, which is normally tuned to 5A or 1A for most industrial applications, receives very little current. This proportionality, also known as the transformation ratio, allows for accurate current measurement while safeguarding workers and equipment from potentially hazardous voltages.
CTs require enough insulation to maintain a high voltage between windings, linearity to minimize measurement error, and high precision for energy metering.
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Safety Warning: When using a CT, never leave the secondary winding open circuit. This is because an open circuit may produce extremely high voltages, which can harm electrical equipment.
Finally, since they enable more precise current monitoring and improved issue detection, current transformers are crucial to ensuring the reliability, efficiency, and safety of modern electrical systems.
Technical Parameters
| Type | Specification | (mm) Outline Size | ||||||
| A | B | C | D | E | F | M | ||
| CT3-100 | 100A/100mA | 118 | 60 | 30 | 108 | 18 | 20 | c4*7 |
| CT3-250 | 250A/100mA | 136 | 64 | 35 | 123.5 | 22 | 25 | c4*7 |
| CT3-400 | 400A/100mA | 180 | 93 | 40 | 165.5 | 32 | 35 | c4*7 |
| CT3-630 | 630A/100mA | 212 | 102 | 40 | 198 | 43 | 41 | c4*7 |
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Accuracy Grade: 0.5 Lead Length: 1 m |
Overload Current: ≥1.2%ln | |||||||
Frequently Asked Questions
What is the basic working principle of a Current Transformer?
A CT operates on the principle of electromagnetic induction, utilizing a primary winding with few turns and a secondary winding with many turns to scale down high currents for safe measurement.
Why is the transformation ratio important?
The transformation ratio allows for high-current circuits to be monitored using low-current safety devices (typically 5A or 1A), ensuring accurate data while protecting personnel and equipment.
What are the risks of an open-circuit secondary winding?
An open secondary circuit can generate dangerously high voltages, which may lead to insulation failure, damage to electrical equipment, and serious safety hazards for operators.
What accuracy grade do these CTs provide?
The technical specifications indicate an Accuracy Grade of 0.5, which is suitable for high-precision energy metering and industrial monitoring applications.
How do I choose the right CT size based on the specifications?
Selection depends on your current requirements (from 100A to 630A) and the physical installation space. Refer to the Outline Size table (A-M dimensions) to match the CT with your hardware layout.
What is the standard overload capacity for these units?
These current transformers are designed to handle an overload current of ≥1.2%ln, ensuring reliability even during minor current surges.