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China MSQ Series Current Transformer: Reliable Power Monitoring Solutions from Trusted Suppliers and Factory
Product Overview
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Electromagnetic Induction Design
Two windings: primary (few turns, series to high-current circuit) and secondary (numerous turns, to safety/measurement devices).
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Standard Secondary Output
Secondary winding typically rated at 5A or 1A, suitable for most industrial applications.
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Safety & Protection
Transformation ratio protects workers and equipment from dangerous voltages while enabling precise current monitoring.
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High Precision & Linearity
High insulation between windings, excellent linearity to minimize measurement error, ideal for energy metering.
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Important Operating Note
The secondary winding must never be left open circuit โ an open circuit can generate extremely high voltages and damage equipment.
Current transformers are crucial to the dependability, effectiveness, and safety of contemporary electrical systems because they allow for more exact current monitoring and problem identification.
Technical Parameters
Dimensional Reference (mm)
| Type | A | B | C | D | E | F | G |
|---|---|---|---|---|---|---|---|
| MSQ-30 | 60 | 36 | 68 | 16 | 60 | 30 | 30 |
| MSQ-40 | 75 | 40 | 82 | 16 | 60 | 30 | 40 |
| MSQ-60 | 101 | 39 | 110 | 16 | 60 | 30 | 60 |
| MSQ-80 | 124 | 40 | 102 | 16 | 60 | 30 | 80 |
| MSQ-100 | 170 | 40 | 120 | 16 | 60 | 30 | 100 |
| MSQ-120 | 165 | 50 | 135 | 16 | 60 | 30 | 120 |
Rated Current & Burden Specifications
| Picture | Type | Rated Current | Rated Burden (VA) | Weight (kg) | |
|---|---|---|---|---|---|
| Class: 0.5 | Class: 1.0 | ||||
 |
MSQ-30 Bar: 30x10mm Conductor: ร20mm |
30/5A | 5 | 5 | 0.30 |
| 60/5A | |||||
| 80/5A | |||||
| 100/5A | |||||
| 200/5A | |||||
| 300/5A | |||||
 |
MSQ-40 Bar: 40x10mm Conductor: ร30mm |
100/5A | 2.5 | 2.5 | 0.38 |
| 200/5A | 5 | 5โ10 | |||
| 300/5A | 5โ10 | 5โ10 | |||
| 400/5A | 5โ10 | 5โ10 | |||
| 500/5A | 5โ10 | 5โ10 | |||
 |
MSQ-60 Bar: 60x20mm Conductor: ร40mm |
300/5A | 5 | 5 | 0.60 |
| 400/5A | 5โ10 | 5โ10 | |||
| 500/5A | 5โ10 | 5โ10 | |||
| 600/5A | 10โ15 | 10โ15 | |||
| 800/5A | 10โ15 | 10โ15 | |||
| 1000/5A | 15 | 15 | |||
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MSQ-80 Bar: 82x30mm Conductor: ร80mm |
750/5A | 15 | 15 | 0.75 |
| 800/5A | 0.82 | ||||
| 1000/5A | 0.89 | ||||
| 1200/5A | 0.99 | ||||
| 1500/5A | 1.02 | ||||
 |
MSQ-100 Bar: 105x30mm Conductor: ร60mm |
1500/5A | 15 | 15 | 0.80 |
| 1600/5A | 0.80 | ||||
| 2000/5A | 0.94 | ||||
| 2500/5A | 1.10 | ||||
| 3000/5A | 1.16 | ||||
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MSQ-120 Bar: 125x57mm or 125x10mm Conductor: ร60mm |
1500/5A | 15 | 15 | 1.00 |
| 2000/5A | 1.15 | ||||
| 2500/5A | 1.45 | ||||
| 3000/5A | 1.60 | ||||
| 4000/5A | 1.90 | ||||
| 5000/5A | 2.20 | ||||
Frequently Asked Questions (FAQ)
What is a current transformer (CT) and how does it work?
A current transformer (CT) operates on the principle of electromagnetic induction. It consists of a primary winding connected in series with the high-current circuit and a secondary winding connected to measurement or protection devices. The CT steps down the high primary current to a safe, proportional secondary current โ typically 5A or 1A โ suitable for instrumentation and metering.
What are the available MSQ series current transformer models?
The MSQ series includes six models: MSQ-30, MSQ-40, MSQ-60, MSQ-80, MSQ-100, and MSQ-120. Each model supports different rated current ranges and busbar/conductor sizes, making them suitable for various industrial power monitoring applications.
Why should the secondary winding of a CT never be left open circuit?
Leaving the secondary winding open circuit while the primary is energized can cause extremely high voltages to develop across the secondary terminals. This can result in insulation breakdown, damage to connected equipment, and serious safety hazards to personnel. Always ensure the secondary circuit is closed or properly shorted when not in use.
What accuracy classes are available for the MSQ series CTs?
The MSQ series current transformers are available in Class 0.5 and Class 1.0 accuracy. Class 0.5 is recommended for precision energy metering applications, while Class 1.0 is suitable for general industrial measurement and monitoring purposes.
What is the rated burden (VA) for the MSQ series current transformers?
Rated burden varies by model and rated current. For smaller models like MSQ-30, the rated burden is 5 VA for both Class 0.5 and Class 1.0. Larger models such as MSQ-60, MSQ-80, MSQ-100, and MSQ-120 support up to 15 VA, with some mid-range models offering 2.5 VA to 10โ15 VA depending on the current ratio selected.
How do I select the right MSQ model for my application?
Selecting the correct MSQ model depends on your primary current range, busbar dimensions, and conductor size. For example, if your busbar is 60x20mm and your rated current is up to 1000/5A, the MSQ-60 is appropriate. Always refer to the technical parameter table to match the model with your specific busbar size, conductor diameter, and required rated current ratio.