Schneider EGR-20UFCM Protection Relay

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

Code Segment	Meaning	Description
EGR	Product Series	Digital earth leakage & fault protection relay, Schneider EOCR series, manufactured by SAMWHA Korea
20	Current Range	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	Mounting Type	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

Core Technical Parameters

Parameter	Specification	Remark
Detection Type	Current(mA) + Voltage(mV)	Dual input, compatible with ZCT
Measuring Current Range	0.03~20A	Wide coverage for diverse applications
Instant Fault Protection	30mA, 30ms	Fast response for personal safety
Operating Characteristic	Inverse / Definite time optional	Flexible for various protection demands
Power Supply	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
Communication	Modbus RTU (RS-485)	Remote monitoring and data acquisition
Auxiliary Contact	SPDT (1C/O)	Rated load AC 250V/3A resistive
Anti-interference	Built-in noise filter	Suitable for high harmonic environment like inverter & UPS
Protection Class	IP52	Dustproof and splash-proof
Mounting	Panel embedded	Compatible with standard 35mm DIN rail
Dimension	W45×H90×D110mm	Compact size, space-saving
Operating Temperature	-20~60℃	Stable operation under harsh industrial conditions
Storage Temperature	-30~80℃	Adapt to extreme storage environment
Certification	CE, UL508, EN61010	Comply with international safety standards
Order Number	EGR-20UFCM	Official unique part number

Full EGR Series Models

Model	Detection Type	Current Range	Mounting	Key Features
EGR-20UFCM	Dual current & voltage	0.03~20A	Panel embedded	Digital display, harmonic resistance
EGR-20USAM	Current signal	0.03~20A	Base mounting	Standard base, easy wiring
EGR-10USVM	Voltage signal	0.03~10A	Base mounting	Voltage input, fit dedicated ZCT
EGR-20RY7M	Current signal	0.05~20A	Panel embedded	RS-485 communication, wide range
EGR-05UFCM	Dual current & voltage	0.03~5A	Panel embedded	Small range, high precision

Cross-brand Replacement Comparison

Brand	Model	Detection Type	Current Range	Communication	Compatibility
Schneider (SAMWHA)	EGR-20UFCM	Dual signal	0.03~20A	Modbus RTU	Perfect match with EOCR and ZCT
Siemens	3UG4615-1CR20	Current	0.03~30A	Modbus RTU	General type, adaptation test required
ABB	CM-IW20	Current	0.05~20A	No communication	High load capacity, compatible with standard ZCT
Chint	ND-63	Current	0.03~30A	Optional RS-485	Cost-effective alternative
Delixi	DZL-20	Current	0.05~20A	No communication	Domestic replacement, slight dimension difference

Replacement Notes

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
Troubleshooting & Maintenance

Fault Phenomenon	Possible Causes	Inspection Steps	Solutions
Frequent false tripping	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
Communication failure	Mismatched parameters, wrong wiring, faulty module	Verify baud rate, address and parity; 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
Application & Cases

Applicable Scenarios

Low-voltage power distribution: Earth fault protection for circuits below AC 600V

Motor Control Center: Combined leakage and overload protection with EOCR relay

Automatic production line: Inverter-driven motors and UPS power supply equipment

Chemical & 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

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

Typical Cases

Case 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%.

Case 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.

Selection & 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

Installation Precautions

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

Item	Cycle	Standard
Visual inspection	Monthly	No crack, looseness or overheating
Functional test	Quarterly	Normal action via leakage simulation
Earthing resistance test	Semi-annually	Resistance ≤4Ω
Communication test	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, fans, 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.