GN19-12ST Horizontal-Mounted Indoor Isolator Switch

Compact 12kV Isolator for Cabinet-Friendly Layouts with Side-Mount Installation

The GN19-12ST is a horizontal-mounted indoor isolator switch engineered for 11–12kV power distribution cabinets. Unlike standard top-mount versions, this model is optimized for side-wall or floor-level installation inside compact metal-clad switchgear. The design reduces space usage and simplifies busbar alignment in tight compartments, making it ideal for urban substations, OEM panel builders, and custom switchgear retrofits.

🔧 Key Features

Model: GN19-12ST (horizontal side-mount version)
Rated Voltage: 12kV
Rated Current: 630A / 1250A
Short-Time Withstand Current: 20kA–31.5kA (1s)
Installation Orientation: Horizontal fixed mounting
Operation Type: Manual handle or electric mechanism
Standards Compliance: IEC 62271-102, GB/T 1985

⚙️ 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 (1min)
Lightning Impulse Withstand	75kV
Mechanical Endurance	≥2000 cycles
Contact Structure	3-pole, air-insulated
Mounting Style	Horizontal inside switchgear

GN19-12ST Horizontal-Mounted Indoor Isolator Switch

🏭 Application Scenarios

The GN19-12ST is engineered to meet installation needs where space and panel layout are major constraints:

✅ Low-Height Cabinet Designs

Allows horizontal integration below the busbar chamber, maintaining compact cabinet profiles.

✅ Switchgear Retrofits & Expansions

Easily fits into existing switchgear shells during upgrade or modification without major redesign.

✅ Urban Power Rooms & Compact Substations

Reduces depth clearance requirements compared to vertical mount types.

✅ Transformer Inlet/Outlet Isolation

Enables flexible placement near MV transformer terminations or cable compartments.

🧱 Design and Material Highlights

Horizontal Shaft Mechanism: Translates the handle rotation smoothly to moving contacts
High Conductivity Copper Contacts: Silver-plated for improved arc resistance
Arc Contact Integration: Minimizes erosion and extends service life
Adjustable Mounting Base: Ensures precise alignment during panel assembly
Optional Interlock Kit: Prevents accidental operation under load

✅ Certifications and Compliance

Fully tested per IEC 62271-102 and GB/T 1985
Withstands lightning impulse and short-circuit duty per standard
Quality control per ISO 9001:2015 production system

❓ Frequently Asked Questions

• What does 'ST' stand for?
“ST” refers to “side-type” horizontal installation, designed for cabinets with unique internal layouts.

• Can this replace a top-mount GN19 switch?
Yes, provided the cabinet supports horizontal busbar alignment and shaft routing.

• Is there an arc extinguishing capability?
This is a non-load break isolator, not designed to interrupt high current—must be opened under no-load conditions.

• Is it compatible with motorized drives?
Yes, the shaft system supports motorized mechanisms for remote control or interlocking logic.

• How is it different from GN19-12CST?
GN19-12CST is through-wall, used to isolate the operator from live parts; GN19-12ST is horizontal, used to optimize panel layout inside the same compartment.