GRM3DC is a DC molded case circuit breaker series for photovoltaic, energy-storage and DC distribution systems. The series covers multiple frame grades from 250A to 800A and is designed for high-voltage DC circuit protection where reliable isolation and short-circuit breaking performance are required.
Series Range
| Model |
Frame grade Inm |
Rated current options |
Rated working voltage |
| GRM3DC-250HU |
250A |
63, 80, 100, 125, 140, 160, 180, 200, 225, 250, 280, 315, 320A |
500 / 1000 / 1500VDC |
| GRM3DC-320HU |
320A |
63, 80, 100, 125, 140, 160, 180, 200, 225, 250, 280, 315, 320A |
500 / 1000 / 1500VDC |
| GRM3DC-400HU |
400A |
225, 250, 280, 300, 315, 350, 400A |
1500/1600VDC |
| GRM3DC-500HU |
500A |
500A |
1000 / 1250 / 1500 / 1500/1600VDC |
| GRM3DC-630HU |
630A |
500, 630A |
1500/1600VDC |
| GRM3DC-800HU |
800A |
700, 800A |
1500/1600VDC |
Electrical Characteristics
| Rated insulation voltage |
DC2300V |
| Rated impulse withstand voltage |
12kV |
| Operational short-circuit breaking capacity |
Ics = 100% Icu |
| Standard |
IEC 60947-2, GB/T 14048.2 |
| Protection level |
IP20 |
| Allowable ambient temperature |
-35°C to +70°C |
| Arcing distance |
≤50 mm, or zero arc with arcing cover |
| Instantaneous action value |
10 In |
Mechanical and Electrical Life
| Frame grade |
Mechanical life |
Electrical life |
| 250A |
20,000 operations |
3,000 / 2,000 / 1,500 operations by voltage configuration |
| 320A |
20,000 operations |
3,000 / 2,000 / 1,500 operations by voltage configuration |
| 400A |
10,000 operations |
1,000 operations |
| 500A |
5,000 operations |
1,000 / 700 / 500 operations by voltage configuration |
| 630A |
5,000 operations |
1,000 / 700 / 500 operations by voltage configuration |
| 800A |
5,000 operations |
1,000 / 1,700 / 500 operations by voltage configuration |
Installation and Accessories
- Installation types include fixed type and plug-in type.
- Supported accessories include auxiliary contact, alarm contact, shunt trip, manual operating mechanism and electric operating mechanism.
- Wiring options include upper-in/lower-out and lower-in/upper-out arrangements; some pole and frame configurations also support same-side wiring arrangements.
