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Schneider EGR-20UFCM Digital Earth Leakage Fault Protection Relay (Exclusiv pentru EOCR)
Schneider EGR-20UFCM este un releu încorporat cu semnal dublu proiectat pentru protecția împotriva scurgerii la pământ.. Dispune de un domeniu larg de măsurare de 0,03 ~ 20A, filtru încorporat și comunicare Modbus. Aplicat pe scară largă în distribuția de energie de joasă tensiune și protecția motorului. Potriviți intervalul actual, tipul de detectare și modul de montare în timpul selecției. Respectați cu strictețe specificațiile de polaritate și împământare ZCT pentru o funcționare fiabilă a sistemului.
- Definiția codului modelului
| Segment de cod | Sens | Descriere |
| EGR | Seria de produse | Digital earth leakage & fault protection relay, Schneider EOCR series, manufactured by SAMWHA Korea |
| 20 | Interval de curent | Max detection current 20A, coverage 0.03~20A |
| UF | Detection Type | Dual-signal mode: U=Voltage(mV), F=Current(mA), compatible with ZCT zero-sequence current transformer |
| CM | Tip de montare | 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
- Parametrii tehnici de bază
| Parametru | Caietul de sarcini | Remarcă |
| Detection Type | Actual(mA) + Voltaj(mV) | Dual input, compatible with ZCT |
| Measuring Current Range | 0.03~20A | Wide coverage for diverse applications |
| Instant Fault Protection | 30mA, 30Domnișoară | Fast response for personal safety |
| Caracteristica de funcționare | Inverse / Definite time optional | Flexible for various protection demands |
| Alimentare electrică | AC/DC 24V or 100~240V | Tensiune largă, global power grid adaptation |
| Afişa | LED digital display | Real-time leakage current indication |
| Fault Record | 5 historical faults + RTC clock | Convenient fault analysis and tracing |
| Comunicare | Modbus RTU (RS-485) | Remote monitoring and data acquisition |
| Contact auxiliar | SPDT (1C/O) | Rated load AC 250V/3A resistive |
| Anti-interference | Built-in noise filter | Suitable for high harmonic environment like inverter & UPS |
| Clasa de protectie | IP52 | Dustproof and splash-proof |
| Montare | Panel embedded | Compatible with standard 35mm DIN rail |
| Dimensiune | W45×H90×D110mm | Dimensiune compactă, economisind spațiu |
| Temperatura de operare | -20~60℃ | Stable operation under harsh industrial conditions |
| Temperatura de depozitare | -30~80℃ | Adapt to extreme storage environment |
| Certificare | CE, UL508, EN61010 | Comply with international safety standards |
| Număr de ordine | EGR-20UFCM | Official unique part number |
- Full EGR Series Models
| Model | Detection Type | Interval de curent | Montare | Caracteristici cheie |
| EGR-20UFCM | Dual current & Voltaj | 0.03~20A | Panel embedded | Digital display, harmonic resistance |
| EGR-20USAM | Current signal | 0.03~20A | Montare pe bază | Standard base, cablare usoara |
| EGR-10USVM | Voltage signal | 0.03~10A | Montare pe bază | Intrare tensiune, fit dedicated ZCT |
| EGR-20RY7M | Current signal | 0.05~20A | Panel embedded | Comunicare RS-485, gamă largă |
| EGR-05UFCM | Dual current & Voltaj | 0.03~5A | Panel embedded | Small range, mare precizie |
- Cross-brand Replacement Comparison
| Marca | Model | Detection Type | Interval de curent | Comunicare | Compatibilitate |
| Schneider (SAMWHA) | EGR-20UFCM | Dual signal | 0.03~20A | Modbus RTU | Perfect match with EOCR and ZCT |
| Siemens | 3UG4615-1CR20 | Actual | 0.03~30A | Modbus RTU | General type, adaptation test required |
| ABB | CM-IW20 | Actual | 0.05~20A | No communication | High load capacity, compatible with standard ZCT |
| Chint | ND-63 | Actual | 0.03~30A | Optional RS-485 | Cost-effective alternative |
| Delicios | DZL-20 | Actual | 0.05~20A | No communication | Domestic replacement, slight dimension difference |
Note de înlocuire
- 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
- Depanare & Întreţinere
| Fenomen de eroare | Cauze posibile | Inspection Steps | Soluții |
| Deplasări false frecvente | Harmonic interference, excessive earthing resistance, valoare de setare scăzută | 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 |
| Eșec de comunicare | Mismatched parameters, wrong wiring, faulty module | Verify baud rate, adresa si paritatea; 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
- Aplicație & Cazuri
Scenarii aplicabile
Distribuția energiei de joasă tensiune: Earth fault protection for circuits below AC 600V
Centrul de control al motoarelor: Combined leakage and overload protection with EOCR relay
Automatic production line: Inverter-driven motors and UPS power supply equipment
Chimic & petroleum industry: Safety protection for flammable and explosive sites, meet ATEX standard
Centru de date: Precision equipment protection to ensure power continuity
Building electrical system: Civil leakage protection complying with GB 13955
Scenarii nepotrivite
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
Caz 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%.
Caz 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.
- Selecţie & Installation Guidelines
Three-step Selection
- Confirm measuring range based on maximum system leakage current (0.03~20A)
- 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
Precauții de instalare
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
Maintenance Schedule
| Articol | Ciclu | Standard |
| Inspecție vizuală | Lunar | No crack, looseness or overheating |
| Functional test | Trimestrial | Normal action via leakage simulation |
| Earthing resistance test | Semianual | Resistance ≤4Ω |
| Test de comunicare | Semianual | Stable data transmission without packet loss |
| Parameter verification | Yearly | Settings conform to site safety requirements |
Application Scenarios of EGR-20UFCM
Applicable Fields
- Protecția motorului industrial
Suitable for variable frequency motors and heavy-duty three-phase motors. Cooperate with EOCR relay for comprehensive leakage and fault protection on production lines, fani, 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.
- HVAC & 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
