GW4-252 Outdoor High Voltage AC Disconnector

Our GW4 72.5, 126 series outdoor AC high-voltage disconnectors are suitable for 50Hz power systems with rated voltages of 12kV, 24kV, 35kV, 40.5kV, 72.5kV and 126kV, used for switching circuits under no-load voltage conditions.

• Anti-pollution type meets the requirements of heavy pollution areas and solves pollution problems during operation; equipped with independent operating mechanisms and interlock devices for safe operation.

• Available in non-earthed, single-earthed and double-earthed types; ordinary and anti-pollution types for different regions; 35-110kV earthing switches have Type I and II, 126kV/220kV are Type II.

• Features: reliable conductive contact via soft connection, external closing of earthing switch, foldable earthing switch for GW4-220 to save space.

• Suitable for 1000-3000m altitude, -40℃ to +40℃ environment; with multiple rated parameters, stable performance and wide applicability.

Product Overview

The complete set of disconnect switch is composed of a GW4-252 type disconnect switch body, CS14G or CS17G type manual operating mechanism, transmission accessories, etc. It can also be equipped with a motorized operating mechanism such as the CJ6 type.

The disconnect switch is a double-column, horizontally-rotating type. Each single pole consists of a base, support insulators, terminal blocks, contacts, and other components. The two support insulators are installed parallel to each other on bearings at both ends of the base and are perpendicular to the base. The main conductive parts are installed above the two insulators and rotate approximately 90 degrees along with the insulators.

The bearing housing of the disconnect switch is designed as a fully sealed structure to prevent jamming caused by dust, moisture, or harmful gases entering the housing. Inside the bearing housing, thrust ball bearings and radial ball bearings are installed to bear the gravity and horizontal component forces of the disconnect switch. This ensures that the operating torque does not increase after long-term operation. The shaft assemblies of each pole are connected and driven through connecting rods and adjusting screws. Stainless steel pins and self-lubricating bushings are used, and the lubricant is high-performance molybdenum disulfide lithium-based grease.

The copper braided strips in the terminal block are firmly connected to the conductive rod and the terminal plate, which is used for customer line connection.

The contact fingers in the intermediate contact section are assembled in pairs. Springs ensure that the contact fingers tightly clamp the finger block and the contact, reducing wear between the contact and the fingers and extending the service life.

When the disconnect switch is equipped with an earthing switch, the interlock between the main circuit and the earthing switch is ensured by a sector plate and an arc-shaped plate on the base. When the main circuit is closed, the earthing switch cannot be closed, and when the earthing switch is closed, the main circuit cannot be closed.

Technical Specifications

Product Name			Unit	Parameters
Rated Voltage			kV	252
Rated Insulation Level	Power Frequency Withstand Voltage (1min, rms)	To Earth	kV	460
	Power Frequency Withstand Voltage (1min, rms)	Across Isolating Distance	kV	460+145
	Lightning Impulse Withstand Voltage (peak)	To Earth	kV	1050
	Lightning Impulse Withstand Voltage (peak)	Across Isolating Distance	kV	1050+200
Rated Frequency			HZ	50
Rated Current			A	1250,1600,2000,2500
Rated Short-Time Withstand Current			kA	31.5,40,50,50
Rated Peak Withstand Current			kA	80,100,125,125
Rated Short-Circuit Duration (Main / Earthing Switches)			S	3/2
Rated Terminal Mechanical Load		Longitudinal	N	1500
		Transverse	N	1000
		Vertical	N	1250
Creepage Distance			MM	5040,6300,7812
Mechanical Endurance			Times	10000
Motor Operating Mechanism		Type		CJ6B
		Motor Voltage	V	AC380,AC220,DC220,DC110
		Control Circuit Voltage	V	AC380,AC220,DC220,DC110
		Opening/Closing Time	S	8±1
Manual Operating Mechanism		Type		CS9,CS14G,CS17G
Manual Operating Mechanism		Solenoid Lock Voltage	V	AC220,DC220,DC110

Type Designation and Meaning

G W 4 - 252 □ (W) / □

G: Disconnect Switch

W: Outdoor

4: Design Serial Number

252: Rated Voltage (kV)

□: Equipped with Earthing Switch

(W): Anti-pollution Type

Last □: Rated Current (kA)

Main Technical Parameters

[Note: Technical parameter table is not included here as it was translated separately in the previous interaction. Please insert it at this point if needed.]

Outline and Installation Dimensions

(Diagram corresponds to: GW-220D(G) Type Outdoor AC Disconnect Switch, Three-Pole Linked Arrangement (Right Earthing))

Labeled Components:

1. Contact Finger Conducting Arm;	2. Contact Conducting Arm;	3. Insulator;	4. Base;
5. Vertical Rod;	6. Coupling (Manual Mechanism);	7. Coupling (Motorized Mechanism);	8. Manual Operating Mechanism;
9. Motorized Operating Mechanism;	10. Three-Pole Linkage Rod for Disconnect Switch;	11. Earthing Switch Conductive Rod;	12. Earthing Switch Connecting Tube;
13. Earthing Switch Spring;	14. Earthing Switch Connecting Joint;	15. Balance Spring Locating Piece;	16. Earthing Terminal.

Dimension Labels: Overall Layout: 4000min (Spacing), 2500 (Height), etc.; Detail Dimensions: M16×35, M16×65, M10×65, 4-Φ18, 2-Φ18, etc.; Mounting Holes: 2×Φ24 (Mounting Holes), etc.

Note: For specifications and quantities of accessories, please refer to the packing list.

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