GN19-12CST Through-Wall Isolator Switch for 12kV Panels

Safe Partition Switching for Indoor MV Panels with Wall-Mount Design

The GN19-12CST indoor isolator switch is a through-wall type isolator designed for 11–12kV medium voltage switchgear. Its unique structure allows the operating mechanism and the conductive parts to be installed on opposite sides of a panel or wall, ensuring safe isolation between control and live compartments. This design is widely used in prefabricated substations, compact switchgear units, and modular distribution rooms where enhanced operational safety is critical.

🔧 Key Features

Model: GN19-12CST (Through-wall version of GN19-12)
Rated Voltage: 12kV
Rated Current: 630A / 1250A
Rated Short-Time Withstand Current: 20kA / 25kA (1s)
Operation Type: Manual / Electric drive (optional)
Installation: Indoor, wall-separation mount
Standards: GB/T 1985, IEC 62271-102

⚙️ Technical Specifications

Parameter	Value
Rated Voltage	12kV
Rated Current	630A / 1250A
Short-Time Withstand Current	20kA / 25kA / 31.5kA (1s)
Peak Withstand Current	50kA / 63kA
Power Frequency Withstand	42kV (1 min)
Lightning Impulse Withstand	75kV
Mechanical Life	≥2000 operations
Installation Type	Through-wall fixed mounting
Insulation Medium	Air insulation

GN19-12CST Through-Wall Isolator Switch for 12kV Panels

🏢 Application Scenarios

The GN19-12CST stands out from standard indoor isolators due to its structural separation, enabling enhanced safety and flexibility in complex installations.

✅ Prefabricated or Container-Type Substations

The operator side and live busbar side are isolated by a panel wall, improving operational protection.

✅ Modular Indoor Switchgear Rooms

Installed in steel enclosures or power distribution rooms with high personnel density.

✅ Power Plants & Utility Grids

Used to isolate MV incoming or outgoing feeders behind protective barriers.

✅ Harsh Indoor Environments

Reduces the risk of operator contact with energized parts during maintenance or switching.

🧱 Structural Highlights

Through-Wall Shaft Assembly: Transfers mechanical motion from outside to inside the cabinet
Dual Compartment Separation: Switch body remains behind the insulating panel
Modular Operating Mechanism: Optional wall-mounted handle or electric actuator
Copper-Tin Contacts: Enhanced conductivity and arc resistance
Compact Arc Extinguishing Device: Reduces contact wear during breaking

✅ Certifications & Integration

Certified to GB/T and IEC standards for MV isolators
Compatible with most 12kV RMUs and switchgear cabinets
Available with factory pre-assembled kits for fast integration

❓ Frequently Asked Questions

• What does “through-wall” mean in this context?
It means the handle and operator mechanism are on the outside of the wall, while the live conductors and switch body are inside the electrical compartment.

• Is this safer than a regular GN19 switch?
Yes. It eliminates direct exposure to live parts during normal operation.

• Can it be retrofitted into existing GN19 panels?
With proper mechanical support and cutouts, yes—especially in containerized rooms.

• Is this switch suitable for load-breaking?
No. Like all isolator switches, it is intended for no-load or lightly loaded circuit isolation.

• Does it support remote operation?
Optional motor mechanisms allow remote SCADA control or interlock logic integration.