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Full Specification of Schneider 3CT-H1-100-C Current Transformer (Dedicated for EOCR)
- Interpretación del código modelo
| Segmento de código | Significado | Descripción |
| 3Connecticut | Serie de productos | Three-phase combined current transformer, customized for Schneider EOCR motor protector, manufactured by SAMWHA Korea |
| H1 | Código de especificación | Primary current rating 100A, circular aperture, applicable for cable outer diameter ≤25mm |
| 100 | Rated Primary Current | 100A (numerator of transformation ratio) |
| do | 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
- Parámetros técnicos básicos
| Categoría de parámetro | Especificación | Remark |
| Transformation Ratio | 100A/5A | Standard secondary current 5A, compatible with full EOCR series |
| Clase de precisión | Clase 1 | Measuring tolerance ±1%, meets protection and metering requirements |
| Rated Burden | 10Virginia | Max permissible secondary loop impedance 200mΩ |
| Rango de frecuencia | 50/60Hz | General industrial frequency |
| Tensión nominal de aislamiento | CA 600 V | Maximum continuous operating voltage |
| Withstand Voltage | 2kV (50Hz, 1mín.) | Insulation test standard between windings and earth |
| Resistencia de aislamiento | ≥100MΩ (DC 500V) | Measured by megohmmeter |
| Aperture Size | Circular φ25mm | Standard bore of H1 series |
| Dimensión general | W150×H71×D55mm | Estructura compacta, space-saving installation |
| Tipo de montaje | Panel mounting | Compatible con carril DIN estándar de 35 mm |
| Material | Plástico de ingeniería ignífugo | Compliant with UL94 V0 standard |
| Peso | Aprox.. 0.58kilos | Single unit weight |
| Proceso de dar un título | CE, UL | Conforms to international safety standards |
| Número de orden | 3CT-H1-100-C | Exclusive official Schneider order code |
- Full Model List (EOCR 3CT Series)
| Modelo | Relación | Aperture Shape | Bore Size | Corriente nominal | Tipo de montaje |
| 3CT-HS-75-C/Z | 75/5A | Circular | φ22mm | 75A | C=Terminal block, Z=Lead wire |
| 3CT-H1-100-C/Z | 100/5A | Circular | φ25mm | 100A | C=Terminal block, Z=Lead wire |
| 3CT-HH-150-C/Z | 150/5A | Cuadrado | 30×30mm | 150A | C=Terminal block, Z=Lead wire |
| 3CT-H2-200-C/Z | 200/5A | Cuadrado | 35×35mm | 200A | C=Terminal block, Z=Lead wire |
| 3CT-H3-300-C/Z | 300/5A | Cuadrado | 45×45mm | 300A | C=Terminal block, Z=Lead wire |
| 3CT-H4-400-C/Z | 400/5A | Cuadrado | 55×55mm | 400A | C=Terminal block, Z=Lead wire |
- Cross-brand Alternative Comparison
| Marca | Modelo | Relación | Exactitud | Burden | Aperture | Compatibilidad |
| Schneider (SAMWHA) | 3CT-H1-100-C | 100/5A | Clase 1 | 10Virginia | φ25mm | Perfect match for EOCR |
| siemens | 5SD7410-7 | 100/5A | Clase 1 | 10Virginia | φ25mm | Universal type, adaptation test required |
| TEJIDO | CT-AR/100 | 100/5A | Clase 1 | 15Virginia | φ25mm | Higher burden capacity, EOCR compatible |
| chint | bh-0.66/100 | 100/5A | Clase 1 | 10Virginia | φ25mm | Cost-effective domestic alternative |
| Delicioso | LMZ1-0.66/100 | 100/5A | Clase 1 | 10Virginia | φ25mm | Reemplazo interno, minor dimension difference |
Notas de reemplazo
- 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
- Solución de problemas & Mantenimiento
| Fenómeno de falla | Posibles causas | Pasos de inspección | Soluciones |
| No secondary output | Cableado incorrecto, 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
- Solicitud & Cases
Escenarios aplicables
EOCR motor protection system: sobrecorriente, undercurrent and phase loss protection
Low-voltage power distribution: Current monitoring and protection for circuits below AC 600V
Motor control center: Compact layout saves cabinet space
Líneas de producción industriales: 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
Casos típicos
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, ahorro 50% espacio de instalación, simplifying wiring and improving operational reliability.
- Selección & Installation Guidelines
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
Precauciones de instalación
Keep correct S1(yo+) and S2(I-) 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
Programa de mantenimiento
| Artículo | Cycle | Estándar |
| Visual inspection | Mensual | No crack, looseness or overheating mark |
| Terminal tightening | Trimestral | Torque range 2-3N·m |
| Prueba de aislamiento | 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 exactitud, 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.
