Product Overview
The QYM6DC series DC molded case circuit breakers (MCCBs) are designed for DC power distribution systems, with a rated working voltage of DC1500V, a rated insulation voltage of 1600V, and a rated impulse withstand voltage of 12kV. The rated current ranges from 63A to 630A.
These breakers are suitable for use in DC grounded systems, negative grounded systems, and neutral point grounded systems, and meet the environmental requirements of photovoltaic DC combiner boxes. They can be installed vertically (front mounting) or horizontally (side mounting).
The product complies with the following standards:
- IEC 60947-1 & GB/T 14048.1 (General rules for low-voltage switchgear and controlgear)
- IEC 60947-2 & GB/T 14048.2 (Low-voltage circuit breakers)
Model Selection Guide
| Code Segment | Definition | Options & Specifications |
|---|---|---|
| QYM6DC | Product Code | DC molded case circuit breaker |
| □ | Frame Grade (Inm) | Inm=320A; Inm=630A |
| 2 | Pole Number | Number of poles (e.g., 2P) |
| L | Wiring Method | None: Front connectionL: Front connection with terminal block |
| □ | Rated Current (In) | Inm=320A: 63A, 80A, 100A, 125A, 140A, 160A, 180A, 200A, 225A, 250A, 280A, 315A, 320AInm=630A: 250A, 280A, 315A, 320A, 350A, 400A, 450A, 500A, 630A |
| DC1500V | Rated Working Voltage | DC1000V; DC1500V |
| ALAXAC230 | Internal Accessories & Voltage | AX: Auxiliary contactAL: Alarm contactSHT: Shunt tripUVT: Undervoltage tripAC230: Accessory rated voltage |
| PAC230 | External Accessories & Voltage | P: Electric operating mechanismAC230: Accessory rated voltage |
Key Features
- Two-Grade Profile Design: Compact size combined with high performance for space-constrained photovoltaic combiner box applications.
- Long Service Life: Mechanical life of 10,000 cycles and electrical life of 2,000 cycles (varies by model).
- Zero Arc Flash Risk: Equipped with arc chutes and three-layer arc-extinguishing metal partitions to eliminate secondary system faults caused by segmented arcing during short-circuit events.
- Superior Breaking Capacity: Optimized to handle high DC short-circuit currents, ensuring reliable system protection.
- Excellent Insulation Performance: Electrical clearance and creepage distance fully comply with UL489 standards, meeting high-voltage DC safety requirements.
- Polarity-Free Protection: Supports both current injection and reverse line connection, providing reliable protection in any wiring configuration (critical for DC systems).
- High Altitude Adaptability: Rated for stable operation at altitudes up to 5,000 meters, suitable for remote photovoltaic installations.
- Wide Temperature Range: Operable in extreme climatic conditions from -40°C to +70°C.
- Harsh Environment Resistance: Resistant to damp heat, salt fog, and mold, ideal for outdoor, coastal, and high-humidity installations.
Technical Specifications Table
| Item | Unit | QYM6DC-320 (2P) | QYM6DC-630 (2P) | ||
|---|---|---|---|---|---|
| DC1000V | DC1500V | DC1000V | DC1500V | ||
| Rated Current (In) | A | 63, 80, 100, 125, 140, 160, 180, 200, 225, 250, 280, 315, 320 | Same as left | 250, 280, 315, 320, 350, 400, 450, 500, 630 | Same as left |
| Pole Number | – | 2 | 2 | 2 | 2 |
| Rated Working Voltage (Ue) DC | V | 1000 | 1500 | 1000 | 1500 |
| Rated Insulation Voltage (Ui) | V | 1600 | 1600 | 1600 | 1600 |
| Rated Impulse Withstand Voltage (Uimp) | kV | 12 | 12 | 12 | 12 |
| Power Frequency Withstand Voltage (1min) | V | 3500 | 3500 | 3500 | 3500 |
| Rated Ultimate Short-Circuit Breaking Capacity (Icu) | kA | 25 | 15 | 30 | 20 |
| Rated Operational Short-Circuit Breaking Capacity (Ics) | kA | 25 | 15 | 30 | 20 |
| Mechanical Life | Cycles | 10000 | 10000 | 10000 | 10000 |
| Electrical Life | Cycles | 1000 | 1000 | 2000 | 1000 |
| Arc Flash Distance | mm | 50, 0 (with arc chute) | Same as left | 50, 0 (with arc chute) | Same as left |
| Instantaneous Release | – | 5In or 10In | Same as left | 5In or 10In | Same as left |
| Reference Ambient Temperature | °C | 40 | 40 | 40 | 40 |
| Dimensions (L × W × H) | mm | 200×83.5×115 | 200×83.5×115 | 275×110×138 | 275×110×138 |