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Full Specification of Schneider 3CT-H1-100-C Current Transformer (Dedicated for EOCR)
- Интерпретация кода модели
| Сегмент кода | Значение | Описание |
| 3Коннектикут | Серия продуктов | 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 | 100А (numerator of transformation ratio) |
| С | 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
- Основные технические параметры
| Категория параметра | Спецификация | Remark |
| Transformation Ratio | 100A/5A | Standard secondary current 5A, compatible with full EOCR series |
| Accuracy Class | Сорт 1 | Measuring tolerance ±1%, meets protection and metering requirements |
| Rated Burden | 10Вирджиния | Max permissible secondary loop impedance 200mΩ |
| Frequency Range | 50/60Гц | General industrial frequency |
| Номинальное напряжение изоляции | AC 600V | Максимальное непрерывное рабочее напряжение |
| Выдерживать напряжение | 2кВ (50Гц, 1мин) | Insulation test standard between windings and earth |
| Insulation Resistance | ≥100MΩ (DC 500V) | Measured by megohmmeter |
| Aperture Size | Circular φ25mm | Standard bore of H1 series |
| Overall Dimension | W150×H71×D55mm | Компактная структура, space-saving installation |
| Тип монтажа | Panel mounting | Совместим со стандартной DIN-рейкой 35 мм. |
| Материал | Flame-retardant engineering plastic | Compliant with UL94 V0 standard |
| Масса | Приблизительно. 0.58кг | Single unit weight |
| Сертификация | CE, UL | Conforms to international safety standards |
| Номер заказа | 3CT-H1-100-C | Exclusive official Schneider order code |
- Full Model List (EOCR 3CT Series)
| Модель | Соотношение | Aperture Shape | Bore Size | Номинальный ток | Тип монтажа |
| 3CT-HS-75-C/Z | 75/5А | Circular | φ22mm | 75А | C=Terminal block, Z=Lead wire |
| 3CT-H1-100-C/Z | 100/5А | Circular | φ25mm | 100А | C=Terminal block, Z=Lead wire |
| 3CT-HH-150-C/Z | 150/5А | Квадрат | 30×30mm | 150А | C=Terminal block, Z=Lead wire |
| 3CT-H2-200-C/Z | 200/5А | Квадрат | 35×35mm | 200А | C=Terminal block, Z=Lead wire |
| 3CT-H3-300-C/Z | 300/5А | Квадрат | 45×45mm | 300А | C=Terminal block, Z=Lead wire |
| 3CT-H4-400-C/Z | 400/5А | Квадрат | 55×55mm | 400А | C=Terminal block, Z=Lead wire |
- Cross-brand Alternative Comparison
| Бренд | Модель | Соотношение | Точность | Burden | Диафрагма | Совместимость |
| Шнайдер (SAMWHA) | 3CT-H1-100-C | 100/5А | Сорт 1 | 10Вирджиния | φ25mm | Perfect match for EOCR |
| Сименс | 5SD7410-7 | 100/5А | Сорт 1 | 10Вирджиния | φ25mm | Universal type, adaptation test required |
| АББ | CT-AR/100 | 100/5А | Сорт 1 | 15Вирджиния | φ25mm | Higher burden capacity, EOCR compatible |
| Чинт | BH-0.66/100 | 100/5А | Сорт 1 | 10Вирджиния | φ25mm | Cost-effective domestic alternative |
| Вкусный | LMZ1-0.66/100 | 100/5А | Сорт 1 | 10Вирджиния | φ25mm | Внутренняя замена, minor dimension difference |
Примечания по замене
- 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
- Поиск неисправностей & Обслуживание
| Явление неисправности | Возможные причины | Inspection Steps | Решения |
| No secondary output | Неправильная проводка, 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 |
Правила безопасности
- 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
- Приложение & Cases
Применимые сценарии
EOCR motor protection system: Перегрузка по току, undercurrent and phase loss protection
Распределение электроэнергии низкого напряжения: 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 (>400Гц) or DC circuits with poor measuring accuracy
Outdoor installation without waterproof enclosure
Secondary circuit burden exceeding 10VA
Typical Cases
Случай 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%.
Случай 2: Crane Control Cabinet Renovation
Replace old split CT with combined 3CT-H1-100-C, saving 50% installation space, simplifying wiring and improving operational reliability.
- Выбор & Рекомендации по установке
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
Меры предосторожности при установке
Keep correct S1(I+) 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
График технического обслуживания
| Элемент | Cycle | Стандартный |
| Визуальный осмотр | Ежемесячно | No crack, looseness or overheating mark |
| Terminal tightening | Ежеквартальный | Torque range 2-3N·m |
| Испытание изоляции | 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.
