Contattore,interruttore automatico,inverter solare,contatore elettrico,batterie solari
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.
- Definizione del codice modello
| Segmento di codice | Senso | Descrizione |
| EGR | Serie di prodotti | Digital earth leakage & fault protection relay, Schneider EOCR series, manufactured by SAMWHA Korea |
| 20 | Intervallo corrente | 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 | Tipo di montaggio | 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
- Parametri tecnici fondamentali
| Parametro | Specifica | Remark |
| Detection Type | Attuale(mA) + Voltaggio(mV) | Doppio ingresso, compatible with ZCT |
| Measuring Current Range | 0.03~20A | Wide coverage for diverse applications |
| Instant Fault Protection | 30mA, 30SM | Fast response for personal safety |
| Caratteristica operativa | Inverse / Definite time optional | Flexible for various protection demands |
| Alimentazione elettrica | AC/DC 24V or 100~240V | Wide voltage, global power grid adaptation |
| Display | LED digital display | Real-time leakage current indication |
| Fault Record | 5 historical faults + RTC clock | Convenient fault analysis and tracing |
| Comunicazione | ModBus RTU (RS-485) | Remote monitoring and data acquisition |
| Contatto ausiliario | SPDT (1C/O) | Rated load AC 250V/3A resistive |
| Anti-interferenza | Built-in noise filter | Suitable for high harmonic environment like inverter & UPS |
| Classe di protezione | IP52 | Dustproof and splash-proof |
| Montaggio | Panel embedded | Compatibile con guida DIN standard da 35 mm |
| Dimensione | W45×H90×D110mm | Dimensioni compatte, salvaspazio |
| Temperatura operativa | -20~60℃ | Stable operation under harsh industrial conditions |
| Temperatura di conservazione | -30~80℃ | Adapt to extreme storage environment |
| Certificazione | CE, UL508, EN61010 | Comply with international safety standards |
| Numero d'ordine | EGR-20UFCM | Official unique part number |
- Full EGR Series Models
| Modello | Detection Type | Intervallo corrente | Montaggio | Caratteristiche principali |
| EGR-20UFCM | Dual current & voltaggio | 0.03~20A | Panel embedded | Display digitale, harmonic resistance |
| EGR-20USAM | Current signal | 0.03~20A | Montaggio su base | Standard base, easy wiring |
| EGR-10USVM | Voltage signal | 0.03~10A | Montaggio su base | Voltage input, fit dedicated ZCT |
| EGR-20RY7M | Current signal | 0.05~20A | Panel embedded | Comunicazione RS-485, ampia gamma |
| EGR-05UFCM | Dual current & voltaggio | 0.03~5A | Panel embedded | Small range, alta precisione |
- Cross-brand Replacement Comparison
| Marca | Modello | Detection Type | Intervallo corrente | Comunicazione | Compatibilità |
| Schneider (SAMWHA) | EGR-20UFCM | Dual signal | 0.03~20A | ModBus RTU | Perfect match with EOCR and ZCT |
| Siemens | 3UG4615-1CR20 | Attuale | 0.03~30A | ModBus RTU | General type, adaptation test required |
| ABB | CM-IW20 | Attuale | 0.05~20A | No communication | High load capacity, compatible with standard ZCT |
| Cinto | ND-63 | Attuale | 0.03~30A | Optional RS-485 | Cost-effective alternative |
| Delizioso | DZL-20 | Attuale | 0.05~20A | No communication | Sostituzione domestica, slight dimension difference |
Note di sostituzione
- 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
- Risoluzione dei problemi & Manutenzione
| Fenomeno di guasto | Possibili cause | Inspection Steps | Soluzioni |
| Frequenti falsi interventi | Harmonic interference, excessive earthing resistance, low setting value | 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 |
| Errore di comunicazione | Mismatched parameters, wrong wiring, faulty module | Verify baud rate, indirizzo e parità; check A/B wire connection; test port voltage | Unify communication parameters; cablaggio corretto; 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
- Applicazione & Cases
Scenari applicabili
Distribuzione dell'energia a bassa tensione: Earth fault protection for circuits below AC 600V
Centro di controllo motorio: Combined leakage and overload protection with EOCR relay
Automatic production line: Inverter-driven motors and UPS power supply equipment
Chimico & petroleum industry: Safety protection for flammable and explosive sites, meet ATEX standard
Centro dati: Precision equipment protection to ensure power continuity
Building electrical system: Civil leakage protection complying with GB 13955
Unsuitable Scenarios
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
Casi tipici
Caso 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%.
Caso 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.
- Selezione & Linee guida per l'installazione
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
Precauzioni per l'installazione
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
Programma di manutenzione
| Articolo | Ciclo | Standard |
| Visual inspection | Mensile | No crack, looseness or overheating |
| Functional test | Trimestrale | Normal action via leakage simulation |
| Earthing resistance test | Semestrale | Resistance ≤4Ω |
| Prova di comunicazione | Semestrale | Stable data transmission without packet loss |
| Parameter verification | Yearly | Settings conform to site safety requirements |
Application Scenarios of EGR-20UFCM
Campi applicabili
- Protezione dei motori industriali
Suitable for variable frequency motors and heavy-duty three-phase motors. Cooperate with EOCR relay for comprehensive leakage and fault protection on production lines, tifosi, 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
