Product Overview
The QYM6 series molded case circuit breaker (MCCB) is designed for high-voltage, high-breaking capacity applications. It has a rated insulation voltage (Ui) of 1250V and is primarily used in AC 50/60Hz systems, suitable for photovoltaic inverter AC sides and other side circuits with a rated working voltage up to AC 1140V and rated working current ranging from 63A to 630A.
It provides reliable overload protection and short-circuit protection for electrical lines and complies with the following international and national standards:
- IEC60947-1, IEC60947-2
- GB/T14048.1, GB/T14048.2
Model Selection Guide
| Code Segment | Definition | Options & Specifications |
|---|---|---|
| QYM6 | Product Code | AC high-voltage molded case circuit breaker |
| 320 | Frame Grade (Inm) | Inm=320A; Inm=630A |
| HU | High Voltage | High-voltage application designation |
| 3 | Pole Number | Number of poles (e.g., 3P, 4P) |
| L | Wiring Method | None: Front connectionL: Back connection with terminal block |
| 160A | 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 |
| AC800V | Rated Voltage | AC690V, AC800V, AC1000V, AC1140V |
| 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
- High Voltage & High Breaking Capacity: Optimized for high-voltage photovoltaic and industrial applications with superior interrupting performance.
- Long Service Life: Mechanical life of 15,000 cycles; Electrical life of 5,000 cycles.
- Advanced Arc Extinguishing System: Equipped with standard arc chutes and three-layer arc-extinguishing metal partitions to prevent secondary system faults caused by segmented arcing.
- Superior Breaking Capacity: Handles high short-circuit currents to ensure system stability.
- Excellent Insulation Performance: Electrical clearance and creepage distance meet UL489 standards.
- No Derating for Reverse Feeding: Supports reverse current feeding without performance degradation (critical for PV systems).
- High Altitude Adaptability: Suitable for operation at altitudes up to 5000 meters.
- Wide Temperature Range: Operable in extreme temperatures from -40°C to +70°C.
- Harsh Environment Resistance: Resistant to damp heat, salt fog, and mold, ideal for outdoor and coastal installations.
- Reliable Single Breaker Point Structure: More stable and reliable than double-break structures (eliminates issues like unreliable bridge contact, easy ablation, bidirectional arcing, secondary faults, high power consumption, and large size).
Technical Specifications Table
| Item | Unit | QYM6-320HU (3P) | QYM6-320HU (3P) | QYM6-630HU (3P) | QYM6-630HU (3P) |
|---|---|---|---|---|---|
| 690/800V | 1000/1140V | 690/800V | 1000/1140V | ||
| Model | – | QYM6-320HU | QYM6-320HU | QYM6-630HU | QYM6-630HU |
| Rated Current (In) | A | 63A, 80A, 100A, 125A, 140A, 160A, 180A, 200A, 225A, 250A, 280A, 315A, 320A | 63A, 80A, 100A, 125A, 140A, 160A, 180A, 200A, 225A, 250A, 280A, 315A, 320A | 250A, 280A, 315A, 320A, 350A, 400A, 450A, 500A, 630A | 250A, 280A, 315A, 320A, 350A, 400A, 450A, 500A, 630A |
| Pole Number | – | 3 | 3 | 3 | 3 |
| Rated Working Voltage (Ue) AC | V | 690/800 | 1000/1140 | 690/800 | 1000/1140 |
| Rated Insulation Voltage (Ui) | V | 1250 | 1250 | 1250 | 1250 |
| 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 | 50 | 15 | 50 | 20 |
| Rated Operational Short-Circuit Breaking Capacity (Ics) | kA | 50 | 15 | 50 | 20 |
| Mechanical Life | Cycles | 15000 | 15000 | 10000 | 10000 |
| Electrical Life | Cycles | 5000/3000 | 1000 | 1500 | 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 | 200×120×115 | 200×120×115 | 275×160×138 | 275×160×138 |
Ordering Instructions
Specification Description Elements
- Breaker name (High-voltage molded case circuit breaker)
- Model (e.g., QYM6-320HU)
- Pole number (e.g., 3P)
- Wiring method (e.g., front connection)
- Rated current (e.g., 250A)
- Rated voltage (e.g., AC800V)
- Quantity (e.g., 120 units)
Order Example
High-voltage molded case circuit breaker; QYM6-320HU/3/250A/AC800V; Quantity: 120 units.