Air-insulated metal-clad withdrawable Switchgear for Substations-36kV 40.5kV

The KYN61 series air-insulated metal-clad withdrawable switchgear is a high-performance medium-voltage solution. Designed with a modular withdrawable module type panel, it is typically fitted with VD4-36/40.5 withdrawable vacuum circuit breakers. The system supports various functional trucks including isolation, PT, and fuse trucks. It is ideal for three-phase AC 50/60 Hz power systems, primarily serving power transmission, distribution, control, and circuit monitoring.

Core Product Advantages 

• Metal-Clad Independent Compartments – Four fully metal-partitioned compartments with independent pressure relief channels, meeting IEC 62271-200:2021  internal arc protection requirements. IP4X enclosure suitable for long-term indoor use.

• Modular Withdrawable Units with IEC Mechanical Interlocks – Interchangeable circuit breaker trolley with triple mechanical interlocks for work/test/disconnect positions, ensuring 5 anti-maloperation functions. Quick extraction and replacement; single-compartment maintenance does not affect entire busbar. Optional PT, isolating, and fuse trolleys for flexible expansion.

• IEC-Certified VD4 Vacuum Circuit Breaker – Type-tested per  IEC 62271-100:2021, with max 100kA peak short-circuit breaking current and outstanding electrical/mechanical life. Rapid fault isolation protects downstream equipment.

• Full-Range Electrical Parameters – Main and branch busbar continuous current: 630A–3150A; max 4s short-time withstand current: 40kA. Adapts to distribution rooms, industrial main transformers, renewable booster stations, urban grids, and more.

• Dual Compliance (IEC & GB Standards) – Unified design meets both IEC and Chinese national standards, suitable for domestic bidding and overseas EPC projects. Secondary circuit supports AC/DC power supply, compatible with mainstream relay protection and monitoring devices.

Main Technical Parameters 

Dimension Drawing

Service Conditions 

• Ambient air temperature: Max. +40°C, Min. -15°C

• Altitude: ≤ 2500m (Note: For altitudes >1000m, external insulation is subject to an altitude correction factor Ka per IEC 62271-1).

• Air humidity: Daily average ≤ 95%, Monthly average ≤ 90%

Typical Application Scenarios

• Municipal indoor 36/40.5kV substations

• 35kV booster distribution equipment for onshore wind & photovoltaic power plants

• Main power distribution rooms of metallurgical, chemical and manufacturing enterprises

• Primary important load power supply systems for data centers, Grade A hospitals and large commercial complexes

• Medium-voltage power supply systems for rail transit, tunnel hubs and airports

• Overseas EPC general contracting projects for power stations, mines and industrial parks