Closed Loop Core Balance Current Transformer Zero Sequence Current Transformer Manufacturers
Product Description
Product Overview
A Closed Loop Residual Zero Sequence Current Transformer (RZCT) is a highly precise current sensing device designed to detect leakage or residual currents in three-phase power systems. Unlike conventional current transformers that measure phase currents individually, the RZCT measures the vector sum of all phase currents passing through its core. Under normal balanced conditions, the sum of the three-phase currents is zero. However, if an insulation fault, leakage, or ground fault occurs, an unbalanced residual current is generated, which the RZCT accurately detects and converts into a proportional output signal.
Product Features
* Flexible output mode, socket or lead output.
* A variety of core hole diameter options, the hole diameter is from φ12mm to φ260mm.
* Casting with epoxy resin, good stability.
* Adopt high magnetic permeability nickel steel or nanocrystalline magnetic core, with good linearity and high sensitivity.
* Excellent balance characteristics, with strong anti-electromagnetic interference ability.
Product Application
Suitable for motor protection, electromagnetic relay protection device, microcomputer protection device; electrical
fire monitoring, fire leakage system, low current grounding system.
Product Parameters
Electrical performance | Operating Temperature | -40℃～+70℃ | Relative Humidity | ≤90% |
Voltage Level | 0.4/0.66/0.72kV | Linear Range | 5%～120% | |
Rated Input Current(AC) | 10mA～5A | Working Frequency | 45～1250Hz | |
Rated Output (AC) | 0～1V or 0～5mA | Medium Strength | 3000V AC/min | |
Accuracy Class | 0.5, 1.0, 2.0 | Insulation Resistance | ＞500 MΩ/500V DC | |
Mechanical structure | Shell Material | PBT/PC Flame Retardant Grade 94-V0 | Output Method | Socket or Shielded Sheathed Wire |
Iron Core Material | Nickel Steel or Ultra Microcrystalline | Construction Plan | Base installation bolts are fixed | |
Sealing and Filling | Epoxy Resin | Environmental Requirements | Meet RoHS |
Model Definition
Typical Value of Main Products
Model NO. | Input Current Rated Value AC | Rated Continuous Thermal Current AC | Common Transformation Ratio | Accuracy Class | Secondary Load(Ω) | Dimensions（mm） | |
Aperture D | Other Size | ||||||
TR21125B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤200 | 25 | L-W-H-J-A1-A2 80-22-69.5-68- 5.2-8 |
TR21126B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 45 | L-W-H-J-A1-A2 120-33-101.5- 98-5.2-8.5 |
TR21127B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 55 | L-W-H-J-A1-A2 150-35-126- 126-5.2-12 |
TR2174B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 35 | L-W-H-J-A1-A2 100-30-90- 83.5-5.2-9.5 |
TR21313B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 32 | L-W-H-J-A1-A2 91-28-70-80- 5.5-7.5 |
TR21314B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 45 | L-W-H-J-A1-A2 104-28-83-93- 5.5-7.5 |
TR21315B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 65 | L-W-H-J-A1-A2 126-28-105- 115-5.5-7.5 |
TR21316B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 80 | L-W-H-J-A1-A2 143-28-122- 132-5.5-7.5 |
TR21317B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 105 | L-W-H-J-A1-A2 172-28-151- 161-5.5-7.5 |
TR21117B | 10mA ~ 5A | 10A | 1000:1 2000:1 | 0.2，0.5 | ≤500 | 72 | L-W-H-J-A1-A2 175-42-150- 150-6.2-13 |
Outline Structure Diagram (Unit :mm）