| Brand | ROCKWILL |
| Model NO. | Metalclad AC Enclosed Switchgear for distribution-40.5kV |
| Rated voltage | 40.5kV |
| Rated frequency | 50/60Hz |
| Series | KYN |
The KYN61-40.5(Z) Metalclad AC Enclosed Switchgear, Withdrawable Type is a high-performance medium-voltage solution engineered for robust, reliable power distribution in large-scale industrial facilities, utility substations, and power grids.
Standards: IEC 62271-200:2021
Withdrawable Mechanism: Circuit breaker units can be readily withdrawn to the test/disconnected position, enabling inspection or replacement without de-energizing the entire switchgear assembly, minimizing system downtime.
Robust Metalclad Enclosure: All-steel welded enclosure provides IP3X protection against solid ingress and mechanical impact, ensuring durability in industrial environments.
Enhanced Safety Interlocks: Mechanical and electrical interlocks prevent misoperations including closing under load or accessing live compartments, safeguarding personnel and equipment.
Scalable Configuration: Adaptable to incoming, outgoing, transformer, and bus-riser configurations, supporting flexible integration into complex distribution architectures.
Low Lifecycle Costs: Durable construction and reduced maintenance requirements lower long-term operational expenses, ensuring cost efficiency.
| Item | Unit | Data |
|---|---|---|
| Rated Voltage | kV | 40.5 |
| Rated Current—Main Bus Bar | A | 1250, 1600, 2000, (2500) |
| Rated Current—Withdrawable VCB Unit | A | 1250, 1600, 2000, (2500) |
| Power Frequency Withstand Voltage (1 min) —To earth & between phases | kV | 95 |
| Power Frequency Withstand Voltage (1 min) —Across isolating distance | kV | 95 (or 118) |
| Lightning Impulse Withstand Voltage —To earth & between phases | kV | 185 |
| Lightning Impulse Withstand Voltage—Across isolating distance | kV | 185 (or 215) |
| Power Frequency Withstand Voltage of Auxiliary & Control Circuits | V/1min | 2000 |
| Rated Frequency | Hz | 50/60 |
| Rated Short-circuit Breaking Current | kA | 20, 25, 31.5 |
| Rated Short-time Withstand Current / Duration | kA/4s | 20, 25, 31.5 |
| Rated Peak Withstand Current | kA | 50, 63, 80 |
| Control Circuit Voltage | V | DC: 110, 220; AC: 110, 220 |
| Degree of Protection—Switchgear Enclosure | — | IP3X |
| Degree of Protection—Compartments (door open) | — | IP2X |
Ambient Temperature: -5 °C to +40 °C (indoor)
Altitude: ≤1000m (Ka correction for higher altitudes)
Relative Humidity: Daily average ≤95%, Monthly average ≤ 90%
Installation: Indoor, free from corrosive gases and excessive dust
Circuit breaker units can be readily withdrawn to the test/disconnected position, enabling inspection or replacement without de-energizing the entire switchgear assembly, minimizing system downtime.
Yes. The withdrawable mechanism minimizes system downtime during maintenance, and durable construction with reduced maintenance requirements lower long-term operational expenses, ensuring cost efficiency.
Yes. The scalable configuration supports flexible integration into complex distribution architectures, accommodating various incoming/outgoing/transformer setups.
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