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Schneider EGR-20UFCM Digital Earth Leakage Fault Protection Relay (Exclusive for EOCR)
Schneider EGR-20UFCM is a dual-signal embedded relay designed for earth leakage fault protection. It features a wide measuring range of 0.03~20A, built-in filter and Modbus communication. Widely applied in low-voltage power distribution and motor protection. Match current range, detection type and mounting mode during selection. Strictly follow ZCT polarity and earthing specifications for reliable system operation.
- Model Code Definition
| Сегмент кода | Значение | Описание |
| EGR | Серия продуктов | Digital earth leakage & fault protection relay, Schneider EOCR series, manufactured by SAMWHA Korea |
| 20 | Текущий диапазон | Max detection current 20A, coverage 0.03~20A |
| UF | Detection Type | Dual-signal mode: U=Voltage(mV), F=Current(мА), compatible with ZCT zero-sequence current transformer |
| СМ | Тип монтажа | Console panel mounting, equipped with digital display and protective cover |
Quick Recognition: EGR-20UFCM = 20A range dual-signal embedded earth leakage protection relay, exclusive for EOCR
- Основные технические параметры
| Параметр | Спецификация | Remark |
| Detection Type | Текущий(мА) + Напряжение(mV) | Dual input, compatible with ZCT |
| Measuring Current Range | 0.03~20А | Wide coverage for diverse applications |
| Instant Fault Protection | 30мА, 30РС | Fast response for personal safety |
| Operating Characteristic | Inverse / Definite time optional | Flexible for various protection demands |
| Источник питания | AC/DC 24V or 100~240V | Широкое напряжение, global power grid adaptation |
| Отображать | LED digital display | Real-time leakage current indication |
| Fault Record | 5 historical faults + RTC clock | Convenient fault analysis and tracing |
| Коммуникация | Модбус РТУ (RS-485) | Удаленный мониторинг и сбор данных |
| Вспомогательный контакт | SPDT (1C/O) | Rated load AC 250V/3A resistive |
| защита от помех | Built-in noise filter | Suitable for high harmonic environment like inverter & UPS |
| Класс защиты | IP52 | Dustproof and splash-proof |
| Монтаж | Panel embedded | Совместим со стандартной DIN-рейкой 35 мм. |
| Измерение | W45×H90×D110mm | Компактный размер, компактный |
| Рабочая температура | -20~60℃ | Stable operation under harsh industrial conditions |
| Температура хранения | -30~80℃ | Adapt to extreme storage environment |
| Сертификация | CE, UL508, EN61010 | Comply with international safety standards |
| Номер заказа | EGR-20UFCM | Official unique part number |
- Full EGR Series Models
| Модель | Detection Type | Текущий диапазон | Монтаж | Ключевые особенности |
| EGR-20UFCM | Dual current & Напряжение | 0.03~20А | Panel embedded | Digital display, harmonic resistance |
| EGR-20USAM | Current signal | 0.03~20А | Базовый монтаж | Standard base, easy wiring |
| EGR-10USVM | Voltage signal | 0.03~10А | Базовый монтаж | Входное напряжение, fit dedicated ZCT |
| EGR-20RY7M | Current signal | 0.05~20А | Panel embedded | Связь RS-485, wide range |
| EGR-05UFCM | Dual current & Напряжение | 0.03~5А | Panel embedded | Small range, высокая точность |
- Cross-brand Replacement Comparison
| Бренд | Модель | Detection Type | Текущий диапазон | Коммуникация | Совместимость |
| Шнайдер (SAMWHA) | EGR-20UFCM | Dual signal | 0.03~20А | Модбус РТУ | Perfect match with EOCR and ZCT |
| Сименс | 3UG4615-1CR20 | Текущий | 0.03~30A | Модбус РТУ | General type, adaptation test required |
| АББ | CM-IW20 | Текущий | 0.05~20А | No communication | High load capacity, compatible with standard ZCT |
| Чинт | ND-63 | Текущий | 0.03~30A | Optional RS-485 | Cost-effective alternative |
| Вкусный | DZL-20 | Текущий | 0.05~20А | No communication | Внутренняя замена, slight dimension difference |
Примечания по замене
- Confirm ZCT compatibility for third-party products to guarantee detection accuracy
- Dual U+F signal is exclusive to EGR-20UFCM, evaluate working condition before replacement
- Select filtered model for high harmonic occasions to avoid false tripping
- Поиск неисправностей & Обслуживание
| Явление неисправности | Возможные причины | Inspection Steps | Решения |
| Frequent false tripping | Harmonic interference, excessive earthing resistance, низкое значение настройки | Check interference sources; measure earthing resistance ≤4Ω; verify parameter setting | Activate filter; optimize earthing system; adjust protection threshold |
| No display under normal status | Power failure, wrong wiring, display damage | Test power voltage; inspect ZCT wiring; check LED status | Restore power circuit; correct S1/S2 polarity; replace display module |
| No response upon fault | Excessive setting value, defective auxiliary contact, damaged ZCT | Check action parameter; test contact continuity; measure ZCT secondary resistance | Lower protection setting; replace contact parts; renew ZCT transformer |
| Communication failure | Mismatched parameters, wrong wiring, faulty module | Verify baud rate, адрес и паритет; check A/B wire connection; test port voltage | Unify communication parameters; correct wiring; replace communication module |
Troubleshooting Rules
- Conduct leakage simulation test after installation to verify performance
- Enable filter function to reduce false action in high harmonic environment
- F01=Earth fault, F02=Overcurrent fault for quick positioning
- Приложение & Cases
Применимые сценарии
Распределение электроэнергии низкого напряжения: Earth fault protection for circuits below AC 600V
Центр управления двигателем: Combined leakage and overload protection with EOCR relay
Automatic production line: Inverter-driven motors and UPS power supply equipment
Химическая & petroleum industry: Safety protection for flammable and explosive sites, meet ATEX standard
Data center: Precision equipment protection to ensure power continuity
Building electrical system: Civil leakage protection complying with GB 13955
Неподходящие сценарии
High voltage system above 1kV without step-down transformer
Pure DC circuit with declined detection accuracy
Strong electromagnetic field without shielding measures
Operation without matched ZCT zero-sequence transformer
Typical Cases
Случай 1: Inverter Motor Protection in Automobile Workshop
10 sets of 75kW variable frequency motors equipped with ZCT-120. EGR-20UFCM adopts dual signal detection and filter design. It realizes 300mA/500ms leakage protection and fault record, improving system reliability by 50%.
Случай 2: Operating Room Power Renovation in Hospital
Meet IEC 61557-8 medical leakage protection standard. Combine EGR-20UFCM and ZCT-35 with 30mA instant protection setting, reaching Class B protection level and securing personnel safety.
- Выбор & Рекомендации по установке
Three-step Selection
- Confirm measuring range based on maximum system leakage current (0.03~20А)
- Choose dual UF signal for inverter occasions, single US signal for general use
- Select CM panel mounting for cabinet installation, SA base type for fast wiring
Меры предосторожности при установке
Thread three-phase four-wire cable through ZCT, neutral wire shall not be omitted
Connect ZCT S1 to EGR I+, S2 to I-, reversed connection causes detection failure
Single-point earthing for relay and ZCT, earthing resistance ≤4Ω
Turn on filter function under variable frequency working condition
Use shielded twisted pair for RS-485, avoid reversed A/B wiring
График технического обслуживания
| Элемент | Cycle | Стандартный |
| Визуальный осмотр | Ежемесячно | No crack, looseness or overheating |
| Functional test | Ежеквартальный | Normal action via leakage simulation |
| Earthing resistance test | Semi-annually | Resistance ≤4Ω |
| Тест связи | Semi-annually | Stable data transmission without packet loss |
| Parameter verification | Yearly | Settings conform to site safety requirements |
Application Scenarios of EGR-20UFCM
Applicable Fields
- Industrial Motor Protection
Suitable for variable frequency motors and heavy-duty three-phase motors. Cooperate with EOCR relay for comprehensive leakage and fault protection on production lines, фанаты, water pumps and air compressors.
- Low-voltage Distribution Circuit
Monitor earth fault of factory power cabinets, MCC control cabinets and branch circuits below AC 600V, prevent fire risks caused by leakage.
- Special Industry Power Consumption
Safety protection for flammable and explosive sites in chemical, oil and mining industry; electric control protection for port cranes and construction machinery.
- Medical Building Power Supply
Precise power distribution for operating rooms and diagnosis rooms, satisfy medical leakage safety standards.
- Data Center Room
Monitor feeder lines of UPS and server cabinets, avoid power outage induced by earth fault.
- ОВК & Water Treatment Equipment
Leakage protection for central air conditioning, circulating water pumps and sewage treatment control systems.
- Intelligent Monitoring Power Distribution
Connect to industrial control system via Modbus RTU, remotely check leakage data and trace fault history.
Inapplicable Fields
- Cannot be directly used on circuits over 1kV without step-down transformer
- Poor detection performance on pure DC power loop
- Prone to false tripping without shielding in strong electromagnetic environment
- Unable to work normally without matched ZCT zero-sequence transformer
