LW8-40.5 Series High Voltage SF6 Circuit Breaker

Our LW8-40.5 series outdoor high-voltage SF6 circuit breakers feature a compact porcelain column design with an integrated CT14 spring-operated mechanism for straightforward installation, easy commissioning, and reliable operation.

• Rated voltage of 40.5kV with rated current up to 2000A; rated short-circuit breaking current up to 31.5kA with peak withstand current up to 80kA for robust fault interruption.

• Mechanical endurance exceeds 3000 operations with annual SF6 leakage rate less than 0.5% achieved through imported sealing gaskets and V-ring dynamic sealing with spring pressure compensation.

• Integrated current transformers utilize high-permeability nanocrystalline alloy cores, capable of achieving accuracy classes 0.2 or 0.2s; up to 12 built-in CTs available per customer requirements.

• Total break time ≤80ms with opening time ≤70ms and closing time ≤100ms for rapid fault clearing.

• Suitable for frequent switching applications; electrical endurance of 20 operations at rated short-circuit breaking current.

• Adaptable to harsh environments with altitude up to 2500m (4000m for plateau type), temperature from -40°C to +40°C, and pollution severity Class III.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Product Overview

The circuit breaker features an outdoor compact porcelain column design, equipped with a CT14 spring-operated mechanism. The mechanism is integrated with the main body for straightforward installation, easy commissioning, and reliable operation, making it suitable for frequent switching applications. Its mechanical endurance exceeds 3,000 operations. Reliable sealing performance is achieved through imported sealing gaskets and a dynamic sealing system utilizing a V-ring with spring pressure compensation. The secondary wiring terminal block for current transformers is supplied by a certified partner, ensuring an annual SF6 leakage rate of less than 1%. The integrated current transformers are constructed with high-permeability nanocrystalline alloy cores, capable of achieving accuracy classes 0.2 or 0.2s. Up to 12 built-in current transformers can be provided according to customer requirements.

Technical Specifications

S.Q.	Item		Unit	Technical Parameter
1	Altitude		m	1000		2000
2	Ambient Air Temperature		-	-30℃~40℃	-40℃~40℃	-30℃~40℃	-40℃~40℃
3	Rated Voltage		kV	40.5		40.5
4	Rated Frequency		Hz	50		50
5	Rated Current		A	2000		2000
6	Rated Short-circuit Breaking Current Isc		kA	31.5	25	31.5	25
7	Rated Short-time Withstand Current / Duration		kA/s	31.5/4	25/4	31.5/4	25/4
8	Rated Peak Withstand Current (peak)		kA	80	63	80	63
9	Rated Short-circuit Making Current (peak)		kA	80	63	80	63
10	First-pole-to-clear Factor		-	1.5		1.5
11	Rated Out-of-phase Breaking Current		kA	Isc25%		Isc25%
12	1-minute Power-frequency Withstand Voltage (r.m.s.)	Across the isolating distance	kV	95+24	95	95	95
		To earth		95	95	95	95
13	Lightning Impulse Withstand Voltage (peak)	Across the isolating distance	kV	185+33	185	185	185
		To earth		185	185	185	185
14	Total Break Time		ms	≤80.0		≤80.0
15	Opening Time		ms	≤70.0		≤70.0
16	Closing Time		ms	≤100.0		≤100.0
17	Open-Close Time		ms	300.0		300.0
18	Close-Open Time		ms	100.0～120.0		100.0～120.0
19	Electrical Endurance		times	20		20
20	Mechanical Endurance		times	3000		3000
21	SF₆ Gas Annual Leakage Rate			≤0.5%		≤0.5%
22	Rated Operating Duty		-	O-0.3s -CO-180s-CO		O-0.3s -CO-180s -CO
23	Opening / Closing Coil Supply Voltage		V	DC220;110		DC220;110
24	Trip Circuit Current		A	2.3;4.6		2.3;4.6
25	Motor Voltage		V	DC220;AC220		DC220;AC220
26	SF6 Gas Pressure	Rated Pressure	Mpa	0.45	0.45	0.45	0.45
		Alarm Pressure		0.42	0.35	0.42	0.35
		Lockout Pressure		0.40	0.30	0.40	0.30

Service Conditions

1. Altitude: Up to 2,500 m; Plateau type: Up to 4,000 m.

2. Ambient Temperature: -30°C to +40°C (Special requirement: -40°C to +40°C).

3. Relative Humidity: Daily average ≤95%, Monthly average ≤90% (at 25°C).

4. Wind Speed: ≤35 m/s. Pollution Severity: Class III. Creepage Distance of Porcelain Housing: 1050 mm (1320 mm available) (Nominal specific creepage distance ≥25 mm/kV).

5. Solar Radiation Intensity: 0.1 W/cm².

6. Ice Covering: 10 mm (maximum).

7. Seismic Conditions: Maximum vertical acceleration 0.3g; Maximum horizontal acceleration 0.15g. The equipment is intended for installation in locations free from flammable materials, explosion hazards, chemical corrosion, and severe vibration.

Model Designation and Explanation

L W 8 - 40.5 / T 2000 - 40

L: SF6 Circuit Breaker

W: Outdoor

8: Design Serial Number

40.5: Rated Voltage (kV)

T: Spring Operating Mechanism

2000: Rated Current (A)

40: Rated Short-Circuit Breaking Current (kA)

(The translation is prepared with reference to the terminology and stylistic conventions commonly found in the English technical documentation of major industry manufacturers such as Sieyuan Electric and Pinggao Group, ensuring alignment with IEC standards and common international practice.)

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