GW4-40.5/126 Outdoor High-Voltage AC Disconnect Switch

The GW4-40.5/126 Disconnect Switch is a newly developed model based on our original series, designed to meet the enhanced technical requirements of the State Grid Corporation. It is suitable for outdoor power distribution systems with a rated voltage of 40.5/126 kV, three-phase AC, 50 Hz.

The switch is used to open and close power lines and equipment under voltage but without load, providing reliable electrical isolation. The product consists of three independent poles, each built with a double-column portal structure and composed of a base, insulator posts, and conductive components.

Each pole features two insulator columns mounted on bearing seats connected to the base. The opening and closing operations are driven by a four-link mechanism. The switch can be equipped with single-side or double-side earthing switches, available in four configurations: non-earthing, left earthing, right earthing, and double earthing.

Product Features

♦ External-compression contact spring
Prevents current-carrying failure due to spring degradation, effectively reducing operational risks.

♦ High-strength conductive structure
Conductive tubes are made of square aluminum alloy; flexible connectors use copper. All contact surfaces are silver-plated for excellent conductivity and mechanical strength.

♦ Reliable transmission system
The operating mechanism uses stainless steel pins and composite bushings, ensuring low friction and stable transmission performance.

♦ Safety interlock
A dependable interlocking device is installed between the main blade and the earthing blade to prevent incorrect operation.

♦ Fully sealed base design
Prevents water and dust intrusion. The bearing seat includes an oil injection port, enabling maintenance without power outage, enhancing reliability and convenience.

♦ Strong anti-corrosion protection
Major steel components are hot-dip galvanized, providing excellent appearance quality and superior corrosion resistance.

Technical Parameters

No.	Item			Unit	Technical Data
1	Rated Voltage			kV	40.5		126
2	Rated Frequency			Hz	50
3	Rated Current			A	1250	2000	2500	4000
4	Main Circuit Resistance			μΩ	≤200	≤150	≤100	≤85
5	Temperature Rise		Test Current	A	1.1 × Rated Current
6	Rated Power Frequency Withstand Voltage (1 min)		To Earth	kV	95		230
6	Rated Power Frequency Withstand Voltage (1 min)		Across Gap	kV	118		230+70
	Rated Lightning Impulse Withstand Voltage (1.2/50ms) Peak		To Earth	kV	185		550
	Rated Lightning Impulse Withstand Voltage (1.2/50ms) Peak		Across Gap	kV	215		550+100
7	Rated Short-time Withstand Current and Duration		Disconnector	kA/s	25/4	31.5/4	40/4	40/4
7	Rated Short-time Withstand Current and Duration		Earthing Switch	kA/s	25/4	31.5/4	40/4	40/4
8	Rated Peak Withstand Current			kA	63	80	100	100
9	Bus-transfer Current Switching Capability		Transfer Current	A			1600
			Transfer Voltage	V			100
			Breaking Operations	Times			C-O 100 times
10	Capacitive Current Switching			A	1
11	Inductive Current Switching			A	0.5
12	Earthing Switch Induced Current Switching Capability	Electromagnetic Induction	Inductive Current	A	50
			Recovery Voltage	kV	0.5
			Breaking Operations	Times	O, C 10 times each
		Electrostatic Induction	Capacitive Current	A	0.4
			Recovery Voltage	kV	3
			Breaking Operations	Times	O, C 10 times each
13	Mechanical Endurance			Times	3000
14	Aux. & Control Circuit Short-time Power Freq. Withstand Voltage			kV	2
15	Terminal Static Mechanical Load		Horizontal Longitudinal	N	800		1000，1250
			Horizontal Transverse		500		750
			Vertical		750		1000
16	Post Insulator		Creepage Distance	mm	≥1256		≥3906
16	Post Insulator		Post Height	mm	550		1200

MAECENAS IACULIS

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ADIPISCING CONVALLIS BULUM

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