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Full Specification of Schneider 3CT-H1-100-C Trasformatore di corrente (Dedicated for EOCR)
- Interpretazione del codice modello
| Segmento di codice | Senso | Descrizione |
| 3CT | Serie di prodotti | Three-phase combined current transformer, customized for Schneider EOCR motor protector, manufactured by SAMWHA Korea |
| H1 | Specification Code | Primary current rating 100A, circular aperture, applicable for cable outer diameter ≤25mm |
| 100 | Rated Primary Current | 100UN (numerator of transformation ratio) |
| C | Mounting/Terminal Type | Terminal block type; Z stands for direct lead wire type |
Quick Identification: 3CT-H1-100-C = Three-phase 100/5A circular-aperture current transformer with terminal block, exclusive for EOCR
- Parametri tecnici fondamentali
| Categoria dei parametri | Specifica | Remark |
| Transformation Ratio | 100A/5A | Standard secondary current 5A, compatible with full EOCR series |
| Classe di precisione | Classe 1 | Measuring tolerance ±1%, meets protection and metering requirements |
| Rated Burden | 10VA | Max permissible secondary loop impedance 200mΩ |
| Gamma di frequenza | 50/60Hz | General industrial frequency |
| Tensione di isolamento nominale | AC 600V | Maximum continuous operating voltage |
| Withstand Voltage | 2kV (50Hz, 1min) | Insulation test standard between windings and earth |
| Resistenza di isolamento | ≥100MΩ (DC 500V) | Measured by megohmmeter |
| Aperture Size | Circular φ25mm | Standard bore of H1 series |
| Dimensione complessiva | W150×H71×D55mm | Struttura compatta, space-saving installation |
| Tipo di montaggio | Panel mounting | Compatibile con guida DIN standard da 35 mm |
| Materiale | Flame-retardant engineering plastic | Compliant with UL94 V0 standard |
| Peso | ca. 0.58kg | Single unit weight |
| Certificazione | CE, UL | Conforms to international safety standards |
| Numero d'ordine | 3CT-H1-100-C | Exclusive official Schneider order code |
- Full Model List (EOCR 3CT Series)
| Modello | Rapporto | Aperture Shape | Bore Size | Corrente nominale | Tipo di montaggio |
| 3CT-HS-75-C/Z | 75/5UN | Circular | φ22mm | 75UN | C=Terminal block, Z=Lead wire |
| 3CT-H1-100-C/Z | 100/5UN | Circular | φ25mm | 100UN | C=Terminal block, Z=Lead wire |
| 3CT-HH-150-C/Z | 150/5UN | Square | 30×30mm | 150UN | C=Terminal block, Z=Lead wire |
| 3CT-H2-200-C/Z | 200/5UN | Square | 35×35mm | 200UN | C=Terminal block, Z=Lead wire |
| 3CT-H3-300-C/Z | 300/5UN | Square | 45×45mm | 300UN | C=Terminal block, Z=Lead wire |
| 3CT-H4-400-C/Z | 400/5UN | Square | 55×55mm | 400UN | C=Terminal block, Z=Lead wire |
- Cross-brand Alternative Comparison
| Marca | Modello | Rapporto | Precisione | Burden | Aperture | Compatibilità |
| Schneider (SAMWHA) | 3CT-H1-100-C | 100/5UN | Classe 1 | 10VA | φ25mm | Perfect match for EOCR |
| Siemens | 5SD7410-7 | 100/5UN | Classe 1 | 10VA | φ25mm | Universal type, adaptation test required |
| ABB | CT-AR/100 | 100/5UN | Classe 1 | 15VA | φ25mm | Higher burden capacity, EOCR compatible |
| Cinto | BH-0.66/100 | 100/5UN | Classe 1 | 10VA | φ25mm | Cost-effective domestic alternative |
| Delizioso | LMZ1-0.66/100 | 100/5UN | Classe 1 | 10VA | φ25mm | Sostituzione domestica, minor dimension difference |
Note di sostituzione
- Ensure secondary burden capacity ≥10VA for non-Schneider products to guarantee protection precision
- Aperture shall match cable outer diameter; H1 series fits cables below 25mm
- Calibrate transformation ratio and phase for alternative models
- Risoluzione dei problemi & Manutenzione
| Fenomeno di guasto | Possibili cause | Inspection Steps | Soluzioni |
| No secondary output | Cablaggio errato, winding open circuit, loose terminals | Check S1/S2 polarity; test secondary resistance; fasten terminals | Correct wiring polarity; replace faulty CT; reinforce terminals |
| Large measuring deviation | Overloaded circuit, mismatched ratio, core saturation | Calculate loop impedance; verify ratio; check overload current | Reduce circuit burden; replace matched model; upgrade CT specification |
| EOCR false tripping | Phase shift, harmonic interference, CT saturation | Test three-phase phase difference; check frequency converter interference; monitor surge current | Recalibrate phase; install harmonic filter; adopt high-saturation CT |
| Insulation failure | Dampness, insulation aging, mechanical damage | Measure insulation resistance; inspect shell cracks; test winding insulation | Dry or replace unit; renew CT; repair damaged parts |
Safety Rules
- Never test open secondary circuit; short-circuit S1/S2 beforehand to avoid high voltage hazard
- Check load and wiring preferentially when deviation exceeds ±2%
- Replace CT immediately if insulation resistance below 10MΩ
- Applicazione & Cases
Scenari applicabili
EOCR motor protection system: Sovracorrente, undercurrent and phase loss protection
Distribuzione dell'energia a bassa tensione: Current monitoring and protection for circuits below AC 600V
Motor control center: Compact layout saves cabinet space
Industrial production lines: Heavy-duty equipment protection in steel, cement and automobile industry
UPS feeder in data center: Precise current monitoring
Inadmissible Scenarios
Long-term operating current over 120A causing core saturation
High frequency (>400Hz) or DC circuits with poor measuring accuracy
Outdoor installation without waterproof enclosure
Secondary circuit burden exceeding 10VA
Casi tipici
Caso 1: Motor Protection in Automobile Workshop
3 sets of 55kW three-phase asynchronous motors equipped with EOCR-3E protector. Model 3CT-H1-100-C is selected. It realizes overcurrent trip and rapid phase loss protection, cutting down failure rate by 40%.
Caso 2: Crane Control Cabinet Renovation
Replace old split CT with combined 3CT-H1-100-C, risparmio 50% spazio di installazione, simplifying wiring and improving operational reliability.
- Selezione & Linee guida per l'installazione
Three-step Selection Method
- Calculate current: Multiply rated motor current by 1.1 overload factor
- Select aperture: Choose circular or square bore according to cable size
- Confirm terminal type: Terminal block for cabinet wiring, lead wire for field wiring
Precauzioni per l'installazione
Keep correct S1(Io+) and S2(IO-) connection to prevent false operation
Strictly prohibit open secondary circuit during installation and maintenance
Total secondary loop impedance shall not exceed 200mΩ
Insulation resistance shall be no less than 100MΩ before commissioning
Programma di manutenzione
| Articolo | Ciclo | Standard |
| Visual inspection | Mensile | No crack, looseness or overheating mark |
| Terminal tightening | Trimestrale | Torque range 2-3N·m |
| Prova di isolamento | Yearly | Resistance ≥100MΩ |
| Ratio calibration | Biennially | Tolerance ≤±1% |
Schneider 3CT-H1-100-C is a dedicated three-phase 100/5A combined current transformer for EOCR motor protectors. Featuring Class 1 accuracy, 10VA rated burden and compact design, it is widely applied in low-voltage motor protection and power monitoring. Match current, aperture and terminal type properly, and comply with polarity and open-circuit prohibition rules to ensure stable system operation.
