Product Introduction

The GW4-40.5 40.5kV Outdoor Three-Phase High Voltage Isolating Switch is a three-phase AC high-voltage electrical device designed for use in 40.5kV power systems. It is primarily used for no-load switching of high-voltage lines and for providing reliable electrical isolation between high-voltage busbars, circuit breakers, and other electrical equipment during maintenance and inspection.

The isolating switch provides a visible and reliable isolation point, helping ensure the safety of maintenance personnel and equipment. It is suitable for outdoor substations, transmission and distribution systems, and other high-voltage applications requiring safe electrical isolation and flexible switching operations.

Product Structure

The GW4-40.5 Outdoor High-Voltage Isolating Switch adopts a double-pillar horizontal rotating structure and consists of three single-pole units. Each pole features a double-column structure, mainly composed of a base, pillar insulators, conductive components, and an operating mechanism. Each pole is equipped with two pillar insulators, which are respectively installed at both ends of the bearing seats and connected through a cross-linkage mechanism, allowing the insulators to rotate horizontally within a range of 90°.

The conductive components are divided into two sections and are respectively fixed to the pillar insulators, with the contacts arranged between the two ceramic insulating columns. During operation, when the mechanism drives one pillar insulator to rotate 90°, the other insulating column is simultaneously driven through the connecting linkage to rotate in the corresponding direction. This coordinated movement enables the disconnecting blades to open and close smoothly and reliably.

To ensure the correct operating sequence and reliable electrical isolation between the disconnecting switch and the earthing switch, reliable mechanical and electrical interlocking devices are incorporated into both the switch and its operating mechanism. This design helps prevent improper operation, enhances operational safety, and ensures dependable performance during equipment maintenance and power system operation.

Product type

1.Ordinary type, dirt-resistant type, plateau type

2.Electric operation, manual operation

3.No grounding, single grounding, double grounding

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	630-4000
4	Rated Short-Circuit Breaking Current	kA	31.5 40 50
5	Rated Withstand Current (Peak)	kA	80/100/125
6	Rated Power Frequency Withstand Voltage	kV	86(Across the contact gaps) / 110(To Ground)
7	Rated horizontal pulling force of terminals	N	750
8	Monopole weight	KG	85

Application environment

Altitude: Altitude ≤1000M, plateau type ≤4000M

Monthly average humidity: ≤90%

Maximum wind speed: ≤35M/s (equivalent to 700Pa on the surface of a cylinder)

Pollution level: Level III.Level IV

Ambient temperature: -35℃-40℃

Maximum daily temperature difference: 25K

Seismic fortification intensity: 8 degrees

Maximum ice thickness: 10mm

Maximum sunshine intensity: 1000W/m²

Product Advantages

GW4-126 Outdoor High Voltage Isolating Switch has many advantages:

Simple structure

Stable performance, easy installation and maintenance. The optimized structural design ensures reliable and stable operation under various outdoor conditions, while the practical configuration simplifies installation, inspection, and routine maintenance, helping reduce downtime and maintenance costs.

Strong corrosion resistance

The overall steel structure is treated with hot-dip galvanizing, providing strong corrosion resistance and excellent durability. This treatment helps protect the equipment from rust and environmental exposure, ensuring reliable long-term operation in outdoor conditions.

Safe and reliable

It adopts maintenance-free bearing seats and reliable interlocking and limit devices, ensuring smooth operation and safe positioning. The optimized design reduces maintenance requirements while improving the overall safety and reliability of the equipment.

No phenomenon of excessive temperature of the outlet line after long-term use

The conductive switch transition link adopts a soft connection structure, and there is no phenomenon of excessive temperature of the outlet line after long-term use.

Product Applications

GW4-40.5 Outdoor High Voltage Isolating Switch has many applications:

Suitable for 40.5kV power systems, providing reliable electrical isolation and switching functions for high-voltage power equipment.

Designed for no-load switching of high-voltage lines, ensuring safe and reliable operation during line maintenance, inspection, and equipment isolation.

Used for reliable electrical isolation between high-voltage busbars, circuit breakers, and other electrical equipment under maintenance and energized high-voltage lines, providing a safe and visible isolation point for inspection and maintenance operations.

Product Outline Drawing

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GW4-40.5 40.5kV Outdoor Three-Phase High Voltage Isolating Switch