The MELPRO-A Series is a MITSUBISHI ELECTRIC protective relay range for power distribution systems. This model provides overcurrent protection, detecting fault currents and tripping circuit breakers. It is used in high-voltage receiving and distribution switchgear. Relay settings are coordinated with upstream and downstream protection so that only the faulted section is isolated, and indication features help maintenance staff identify the cause of a trip quickly.
| Part No. |
Type |
Rated Frequency (Hz) |
Power Consumption |
Rated Input Voltage (V) |
Rated Input Current (A) |
Display Items |
Operation Indicator |
No. of Setting Steps |
Control Power Supply |
RoHS Directive (10 Substances) |
Case |
| MDG-A3V-R 104PGA L01 |
Directional ground fault relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
7 |
0.2 |
Directional ground fault |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit fixed type |
| MDG-A3V-RD 519PGA L01 |
Directional ground fault relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
7 |
0.2 |
Directional ground fault |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit draw-out type |
| MDG-A4V-R 105PGA L01 |
Directional ground fault relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
110/190 (switched by relay terminal) |
0.2 |
Directional ground fault |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit fixed type |
| MDG-A4V-RD 520PGA L01 |
Directional ground fault relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
110/190 (switched by relay terminal) |
0.2 |
Directional ground fault |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit draw-out type |
| MGR-A3T-R 111PGA L01 |
Ground fault relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 7.0VA |
- |
0.2 |
Ground fault |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit fixed type |
| MGR-A3V-R 110PGA L01 |
Ground fault relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
- |
0.2 |
Ground fault |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit fixed type |
| MOC-A3T-R 103PGA L01 |
Overcurrent relay |
50/60 switchable |
Normal: 3.5VA, operating: 4.5VA |
- |
5 |
R-phase, T-phase, instantaneous |
Operated: orange, Reset: black |
3-stage-2-stage |
- |
Compliant |
Unit fixed type |
| MOC-A3V-R 102PGA L01 |
Overcurrent relay |
50/60 switchable |
Normal: 3.5VA, operating: 4.5VA |
- |
5 |
R-phase, T-phase, instantaneous |
Operated: orange, Reset: black |
3-stage-2-stage |
- |
Compliant |
Unit fixed type |
| MOC-A3V-RD 518PGA L01 |
Overcurrent relay |
50/60 switchable |
Normal: 3.5VA, operating: 4.5VA |
- |
5 |
R-phase, T-phase, instantaneous |
Operated: orange, Reset: black |
3-stage-2-stage |
- |
Compliant |
Unit draw-out type |
| MOV-A3V-R 107PGA L01 |
Overvoltage relay |
50/60 switchable |
Normal: 4.0VA, operating: 6.0VA |
110 |
- |
Overvoltage |
Operated: orange, Reset: black |
- |
- |
Compliant |
Unit fixed type |
| MOV-A3V-RD 522PGA L01 |
Overvoltage relay |
50/60 switchable |
Normal: 4.0VA, operating: 6.0VA |
110 |
- |
Overvoltage |
Operated: orange, Reset: black |
- |
- |
Compliant |
Unit draw-out type |
| MUV-A3V-R 106PGA L01 |
Undervoltage relay |
50/60 switchable |
Normal: 3.0VA, operating: 3.0VA |
110 |
- |
Undervoltage |
Operated: orange, Reset: black |
- |
- |
Compliant |
Unit fixed type |
| MUV-A3V-RD 521PGA L01 |
Undervoltage relay |
50/60 switchable |
Normal: 3.0VA, operating: 3.0VA |
110 |
- |
Undervoltage |
Operated: orange, Reset: black |
- |
- |
Compliant |
Unit draw-out type |
| MVG-A3V-R 108PGA L01 |
Ground fault overvoltage relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
7 |
- |
Ground fault overvoltage |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit fixed type |
| MVG-A3V-RD 523PGA L01 |
Ground fault overvoltage relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
7 |
- |
Ground fault overvoltage |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit draw-out type |
| MVG-A4V-R 109PGA L01 |
Ground fault overvoltage relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
110/190 (switched by relay terminal) |
- |
Ground fault overvoltage |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit fixed type |
| MVG-A4V-RD 524PGA L01 |
Ground fault overvoltage relay |
50/60 switchable |
Control power normal: 3.0VA, control power operating: 4.0VA |
110/190 (switched by relay terminal) |
- |
Ground fault overvoltage |
Operated: orange, Reset: black |
- |
Rated voltage: AC110V (fluctuation range 90~120V) |
Compliant |
Unit draw-out type |
Confirm relay function, current transformer ratio, settings and control power. Please confirm the full part number and options against the MITSUBISHI ELECTRIC catalog; contact us if you need help identifying the right model.
Mitsubishi Electric is a Japanese manufacturer of factory automation and low-voltage power distribution equipment, including MELSEC PLCs, servo systems, inverters, magnetic contactors and starters, circuit breakers and measuring instruments.