The GN27-40.5D Series is a high-performance indoor AC high voltage disconnect switch designed for power systems with a rated voltage of 40.5kV (widely used in 35kV networks) and AC 50/60Hz. It serves as a reliable visible isolation point for maintenance and circuit reconfiguration in substations and industrial power distribution units.
Core Technical Specifications
| Parameter Name | Unit | GN27-40.5D (Typical Value Range) |
| Rated Voltage | kV | 40.5 |
| Rated Current | A | 630 / 1250 / 2000 / 2500 |
| Rated Short-time Withstand Current (4s) | kA | 20 / 31.5 / 40 |
| Rated Peak Withstand Current | kA | 50 / 80 / 100 |
| Rated Insulation Level (1min Power Frequency Withstand Voltage, Phase-to-Ground/Phase-to-Phase) | kV | 95 |
| Rated Insulation Level (Lightning Impulse Withstand Voltage, Phase-to-Ground/Phase-to-Phase) | kV | 185 |
| Rated Insulation Level (1min Power Frequency Withstand Voltage, Across Open Contacts) | kV | 115 |
| Rated Insulation Level (Lightning Impulse Withstand Voltage, Across Open Contacts) | kV | 215 |
| Mechanical Endurance | Cycles | 2000 |
| Ambient Temperature Range | °C | -25 ~ +40 |
| Relative Humidity | % | Daily average≤95%, Monthly average≤90% |
| Altitude | m | ≤1000 |
| Earthquake Intensity | Degree | ≤8 |
| Operation Method | – | Manual / Motorized |
Installation, Maintenance, & Safety Assurance
Convenient Installation: The GN27-40.5D features a standardized design, ensuring a simple and rapid installation process. We can provide detailed installation dimension drawings and professional on-site guidance as per client requirements.
Low Maintenance Needs: Thanks to high-quality materials and precise manufacturing, this product boasts high reliability and an extended maintenance-free period, significantly reducing operational costs for users.
Safety First: In addition to the built-in mechanical interlocks, we provide clear operational indicators and optional earthing switches to further enhance safety. The product fully complies with international and national standards such as GB and IEC, giving users peace of mind.
Why Choose GN27-40.5D?
Enhanced Safety Interlock: The “D” model features an integrated Earthing Switch, ensuring the circuit is safely grounded before maintenance.
Advanced Rotary Contact Design: Uses a vertically rotating blade structure with self-cleaning multi-contact plates, reducing contact resistance and heat buildup.
Reinforced Insulation: Equipped with high-grade porcelain or epoxy resin insulators, meeting Class II pollution environment requirements.
Low Operating Torque: Engineered with a helical transmission mechanism for smooth, lightweight manual operation, extending mechanical life to over 2,000 cycles.
Compliance: Fully compliant with IEC 62271-102 international standards for high-voltage alternating current disconnectors.
