Product Overview
The Ex9ASD-DC Series Air Switch Disconnector is a next-generation DC switch disconnector designed specifically for high-efficiency photovoltaic (PV) and battery energy storage systems (BESS). It provides safe isolation and reliable disconnection for DC distribution systems, ensuring secure operation and maintenance in utility-scale solar plants and energy storage installations.
Main Features
- High Voltage Capacity: Supports DC 750V / 1000V / 1500V rated voltage
- High Current Rating: Up to 4000A rated current for large-scale applications
- Superior Short-Circuit Withstand: Up to 100kA short-time withstand current @ DC1500V
- Zero Flashover Design: Safe interruption with visible isolation point
- Flexible Installation: Fixed type or drawer type for various cabinet configurations
- Bidirectional Configuration: Supports horizontal, vertical, and mixed busbar connections
- Long Service Life: Mechanical life up to 20,000 operations; maintenance-free life up to 10,000 operations
- Extreme Environment Operation: Functions reliably from -45°C to +70°C, up to 5000m altitude without derating
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Voltage (Ue) | DC 750V / 1000V / 1500V |
| Rated Current (In) | Up to 4000A (Frame sizes: 2500A, 4000A) |
| Insulation Voltage (Ui) | 1600V |
| Impulse Withstand Voltage (Uimp) | 12kV |
| Short-time Withstand Current (Icw) | Up to 100kA @ DC1500V (1 second) |
| Utilization Category | DC-PV2, DC-22A, DC-23A |
| Installation Type | Fixed type or Drawer type |
| Ambient Temperature | -45°C ~ +70°C |
| Altitude | Up to 5000m (no derating) |
| Mechanical Life | 20,000 operations |
| Maintenance-free Life | 10,000 operations |
| Protection Degree | IP30 (standard), IP54 (optional) |
| Standard | IEC 60947-3 |
Technical and Application Notes
The Ex9ASD-DC is specifically tested for the strictest DC-PV2 switching conditions, enabling repeated and safe operation with real PV load profiles. Unlike circuit breakers that interrupt circuits upon fault conditions, switch disconnectors provide manual or remote isolation with a clear visible disconnection point, allowing operators to confirm isolation before commencing maintenance work.
The poles-in-series design with jumper configuration supports ungrounded systems commonly found in photovoltaic installations. The modular drawer-type design simplifies system integration and maintenance access, while the fixed-type option provides cost-effective solutions for standard installations.
Important: For systems above 1000VDC, ensure proper arc flash protection and follow all local electrical codes for high-voltage DC installations.
Typical Applications
- DC Combiner Boxes in PV systems
- DC Main Distribution Panels
- Inverter Input / PCS Isolation
- Battery Cluster Isolation in BESS
- Utility-scale photovoltaic power plants
- Battery energy storage systems (BESS)
- Hybrid energy systems (PV + Storage + Grid)
- Industrial DC distribution systems
Ordering Support
When ordering Ex9ASD-DC series switch disconnectors, please specify:
- Rated voltage (750V / 1000V / 1500V DC)
- Rated current and frame size (up to 4000A)
- Installation type (Fixed or Drawer)
- Busbar connection orientation (horizontal/vertical/mixed)
- Protection degree requirements (IP30/IP54)
- Operating environment conditions
Custom configurations are available for specific system requirements. Please contact our technical team for assistance with high-capacity or specialized applications.
Product Catalog
For detailed technical drawings, dimensions, wiring diagrams, and complete specifications, please refer to the product catalog below.
