Protection Functions:

3-phase overcurrent (instantaneous, definite/IDMT time)

Earth fault protection (sensitive and directional)

Negative sequence/unbalance protection

Under/over voltage protection

Frequency protection (under/over)

Thermal overload protection

Circuit breaker failure protection

Monitoring & Control:

True RMS measurements (V, I, P, Q, S, PF, Hz)

Energy metering (kWh, kVARh)

8 programmable logic outputs

12 digital inputs

Fault recorder with oscillography

Load profile recording

3. Technical Specifications
Electrical Parameters:

Parameter Specification
Rated Voltage 100-240V AC/DC or 24-48V DC
Voltage Input 100-480V AC (phase-to-phase)
Current Input 1A or 5A nominal (configurable)
Burden <0.2VA per current input
Frequency Range 45-65Hz (16-70Hz for special order)
Protection Characteristics:

Function Range Accuracy
Overcurrent 0.05-40 x In ±1% or ±30ms
Earth Fault 0.01-5 x In ±2% or ±40ms
Voltage Protection 10-150% Un ±0.5%
Frequency Protection 40-70Hz ±0.01Hz
Communication:

Dual Ethernet ports (IEC 61850, Modbus TCP)

RS-485 (Modbus RTU, DNP3.0)

USB for local configuration

IEC 61850 Ed.2 compliant

GOOSE messaging support

Mechanical Specifications:

Parameter Specification
Dimensions 177x177x150mm
Weight 2.5kg
Enclosure IP54 front panel
Mounting Panel or 19" rack mount
4. Applications
Medium voltage switchgear protection

Transformer protection

Motor protection (HV motors)

Generator protection

Feeder protection in industrial plants

Renewable energy systems

5. Environmental Specifications
Parameter Specification
Operating Temperature -25°C to +70°C
Storage Temperature -40°C to +85°C
Relative Humidity 5-95% non-condensing
Altitude Up to 3000m without derating
6. Certifications & Standards
IEC 60255 series (Measuring relays)

IEC 62271 (HV switchgear standards)

IEEE C37.90 (Relay withstand capability)

UL 1053 (Ground fault protection)

CE, UKCA, RCM compliant

SIL 2 certified (Safety Integrity Level)

7. Ordering Information
Base unit: MFR-13-100 (100-240V AC/DC supply)

Options:

MFR-13-FC: Fiber optic communication module

MFR-13-GPS: GPS time synchronization

MFR-13-ARC: Arc flash detection input