100% SF6-Free • IP67 Solid Embedded Poles • -40°C Cold Proof
Solid Insulated Ring Main Unit (SIS 12kV / 24kV)
The eco-friendly successor to traditional SF6 gas-insulated switchgear. Primary live conductors, vacuum interrupters, and disconnectors are permanently encapsulated in epoxy resin and conductive EPDM shield, eliminating greenhouse gas regulations, pressure gauge monitoring, and cold-temperature gas liquefaction failure.
SIS-12 Solid Insulated Ring Main Unit (Modular C / V / F Units)
// Revolutionary Insulation
Why Global Utilities Are Switching from SF6 RMU to SIS
Sulfur hexafluoride (SF6) has a Global Warming Potential (GWP) of 23,500 and liquefies at sub-zero temperatures (causing catastrophic insulation breakdown below -25°C without tank heating). AIKey SIS uses solid embedded poles to provide complete environmental immunity.
- ✓ IP67 Protection Degree: Live parts are completely sealed in APG epoxy resin casting. Fully flood-proof, dust-proof, and salt-fog resistant.
- ✓ -40°C to +45°C Native Operation: No gas pressure monitoring, no gas refills, no SF6 heating resistors required in Siberian winters.
- ✓ Visible Disconnect Gap: Mechanical visual observation window allows field operators to physically verify the three-position disconnect status before earthing.
- ✓ Modular Plug-and-Play Expansion: Standard C (Load Switch), V (Circuit Breaker), and F (Fuse Combination) units connect seamlessly via solid shielded busbars.
Solid Insulated Switchgear Electrical Ratings & Characteristics (IEC 62271-200)
| Technical Parameter | Unit | V Unit (Circuit Breaker) | C Unit (Load Switch) | F Unit (Fuse Combination) |
|---|---|---|---|---|
| Rated Voltage (Ur) | kV | 12 | 12 | 12 |
| Rated Frequency (fr) | Hz | 50 / 60 | 50 / 60 | 50 / 60 |
| Rated Normal Current (Ir) | A | 630 / 1250 | 630 | 125 (Fuse dependant) |
| Power Frequency Withstand Voltage (1 min) | kV | 42 (to earth) / 48 (across gap) | 42 / 48 | 42 / 48 |
| Lightning Impulse Withstand (1.2/50μs) | kV | 75 (to earth) / 85 (across gap) | 75 / 85 | 75 / 85 |
| Rated Short-Time Withstand Current (4s) | kA | 20 / 25 | 20 / 25 | — |
| Rated Peak Withstand Current (Ip) | kA | 50 / 63 | 50 / 63 | 50 (with fuse) |
| Rated Short-Circuit Breaking Current | kA | 20 / 25 | — | 31.5 (Fuse breaking) |
| Mechanical Endurance (Operations) | Times | 10,000 (M2 Class) | 5,000 (M1 Class) | 3,000 |
| Protection Degree (Primary High Voltage) | — | IP67 | IP67 | IP67 |
| Protection Degree (External Enclosure) | — | IP4X | IP4X | IP4X |
| Operating Ambient Temperature | °C | -40°C to +45°C | -40°C to +45°C | -40°C to +45°C |