High-Quality GN19-12 Indoor High-Voltage Isolating Switch Factory, Companies

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High-Quality GN19-12 Indoor High-Voltage Isolating Switch Factory, Companies

The GN19-12(C) series indoor high-voltage disconnectors are essential switchgear for power systems with a rated voltage of 12kV and frequency of 50Hz or below. Equipped with the 036-1 manual operating mechanism, they are used to open and close circuits under energized but no-load conditions. There are also derivative products, such as anti-pollution type, high-altitude type, and versions fitted with live-line indicating devices. They are suitable for environments: altitude ≤1000m, ambient temperature -30℃ to +40℃, relative humidity ≤90% at +25℃, seismic intensity ≤8, and free from fire, explosion risk, severe pollution, chemical corrosion and intense vibration.

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Product Description

Type & Meaning

1	Disconnector
2	Indoor type
3	Design serial number
4	Rated voltage
5	Wall-through type
6	Rated current
7	Rated short-time withstand current (4s)

Model Description

GN19-12: Flat-mounted type
GN19-12C: Wall-through type

C1: Rotating side at wall-through side
C2: Breaking side at wall-through side
C3: Both sides are wall-through type

Derivative Model Description

Anti-pollution type: GN19-12W(C)
High-altitude type: GN19-12G(C)
With live-line indicating device: GN19-12X(C)

Product Display

Technical Parameters

Model	Rated Voltage (kV)	Maximum Voltage (kV)	Rated Current (A)	4s Thermal Withstand Current (RMS) (kA)	Dynamic Withstand Current (Peak) (kA)
GN19-12/400-12.5	12	11.5	400	12.5	31.5
GN19-12/630-20	12	11.5	630	20	50
GN19-12/1000-31.5	12	11.5	1000	31.5	80
GN19-12/1250-40	12	11.5	1250	40	100
GN19-12C/400-12.5	12	11.5	400	12.5	31.5
GN19-12C/630-20	12	11.5	630	20	50
GN19-12C/1000-31.5	12	11.5	1000	31.5	80
GN19-12C/1250-40	12	11.5	1250	40	100

Outline and Installation Dimension

Model	A	B	C	D			E			F
GN19-12/400	450	436	4-14×24	210	230	250	620	660	700	870	900	940
GN19-12/630	470	436	4-14×24
GN19-12/(1000 or 1250)	500	530	4-18×28
GN19-C/400	420	625	4-14×24
GN19-C/630	420	680	4-14×24
GN19-C/(1000 or 1250)	505	745	4-18×28

Main Structure and Working Principle

The GN19-12 series disconnectors are available in flat-mounted (GN19-12) and wall-through (GN19-12C1) versions. Each phase of the GN19-12 conductive part is fixed to the base frame via two post insulators, while the GN19-12C1 uses one insulator and one porcelain bushing. Both types are installed in three parallel phases. The conductive part consists of contact blades and contacts; each contact blade is connected to the main shaft on the base frame via a tie rod insulator. The main shaft links to the CS6-1 operating mechanism through cranks and connecting rods, with a connecting rod (user-supplied) on the mechanism driving the auxiliary switch.

Each contact blade is made of two grooved copper plates, which increases heat dissipation area and mechanical strength, improving dynamic stability. Contact pressure is maintained by contact springs. The 1000A and 1250A versions have magnetic-locking plates at contacts to boost pressure, enhancing dynamic and thermal stability; 400A and 630A versions omit these plates due to lower current ratings and closer blade spacing. The CS6-1 mechanism has a self-locking device to hold the disconnector in open or closed positions.

Frequently Asked Questions

1. What is the primary difference between GN19-12 and GN19-12C?

The GN19-12 is a flat-mounted indoor disconnector that utilizes two post insulators per phase on the frame. In contrast, the GN19-12C is a wall-through type that uses one post insulator and one porcelain bushing per phase, designed specifically for through-wall installations.

2. What operating mechanism is used to operate the GN19-12 disconnector?

The GN19-12 disconnector connects to a CS6-1 operating mechanism via connecting rods and cranks. The CS6-1 mechanism includes a built-in self-locking system that reliably holds the disconnector in the fully open or fully closed position.

3. Why do the 1000A and 1250A versions feature magnetic-locking plates?

Higher current ratings require greater contact retention under short-circuit electromagnetic forces. The magnetic-locking plates installed at the contact points of 1000A and 1250A models significantly boost contact clamping pressure, greatly enhancing dynamic and thermal stability.

4. What derivative configurations are offered for harsh environments?

The series includes dedicated derivative models: the GN19-12W(C) for anti-pollution conditions, the GN19-12G(C) for high-altitude installations, and the GN19-12X(C) equipped with live-line indicating devices.

5. What are the rated current specifications available in this series?

The GN19-12 series comes in four standard rated current options: 400A, 630A, 1000A, and 1250A, with 4-second thermal withstand currents ranging from 12.5 kA up to 40 kA.

6. How do the contact blades improve heat dissipation?

Each contact blade is manufactured from two grooved copper plates. This design not only expands the effective surface area for convective heat dissipation but also strengthens overall mechanical rigidity and improves dynamic stability.