LW36-126 Series Outdoor High Voltage SF6 Circuit Breaker

Our LW36-126 series outdoor high-voltage SF6 circuit breakers feature self-blast arc-quenching technology with a spring-operated mechanism, delivering long electrical life, low operating energy, and high reliability for 126kV power systems.

• Rated voltage of 126kV with rated current of 3150A; rated short-circuit breaking current of 40kA with short-circuit making current up to 100kA for robust fault interruption.

• Self-blast arc-quenching technology with internationally advanced design reduces operating energy, minimizes noise, and ensures high reliability.

• Main circuit resistance ≤40μΩ; rated line-charging switching current of 31.5A; rated out-of-phase breaking current of 10kA.

• Rated short-line fault breaking current at 90%IK and 75%IK; operating duty of O-0.3s-CO-180s-CO.

• Adaptable to harsh environments with altitude up to 2000m (3000m available with insulation correction), temperature as low as -40°C, and pollution level up to Class IV.

• Simple structure, compact size, and long maintenance-free intervals; fully replaces imported products for oil-free, high-capacity applications.

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

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Product Overview

The LW36-126/3150-40 Self-blast AC High Voltage SF6 Circuit Breaker is an outdoor type product. It is suitable for use in 50Hz AC power grids with a maximum voltage of 126kV, in areas with an altitude not exceeding 2000 meters (products for altitudes above 3000 meters can be designed), an ambient temperature not lower than -40°C, and a pollution level not higher than Class IV. It is designed to interrupt rated current, fault current, or to switch lines, providing control and protection for power systems, and can also be used as a tie circuit breaker.

This product uses SF6 gas as both the arc-extinguishing and insulation medium. It incorporates internationally advanced self-blast arc-quenching technology and is equipped with a new type of spring-operated mechanism. It features long electrical life, low operating energy, low noise, and high reliability. With its simple structure, compact size, and long maintenance-free intervals, this product can fully replace imported products of the same type in the current trend towards oil-free and high-capacity power equipment.

Technical Specifications

S.Q.	Name		Unit	Data
1	Rated Voltage		kV	126
2	Rated Power Frequency Withstand Voltage (1 min)	To Earth	kV	K ·230
2	Rated Power Frequency Withstand Voltage (1 min)	Across Isolating Distance	kV	K ·265
3	Rated Lightning Impulse Withstand Voltage	To Earth	kV	K ·550
3	Rated Lightning Impulse Withstand Voltage	Across Isolating Distance	kV	K ·630
4	Power Frequency Withstand Voltage at Zero SF6 Gas Gauge Pressure		kV	K ·95
5	Rated Frequency		Hz	50
6	Rated Current		A	3150
7	First-Pole-to-Clear Factor			1.5
8	Rated Short-Circuit Breaking Current			40
9	Rated Short-Circuit Making Current (Peak)		kA	100
10	Rated Short-Time Withstand Current		kA	40
11	Rated Peak Withstand Current		kA	100
12	Rated Duration of Short-Circuit		S	4
13	Rated Out-of-Phase Breaking Current		kA	10
14	Rated Short-Line (Near-to-Generator) Fault Breaking Current		kA	90%lk,75%lk
15	Rated Line-Charging Switching Current		A	31.5
16	Rated Operating Sequence			O-0.3s-CO-180s-CO
17	Main Circuit Resistance		μΩ	≤40
Note: The external insulation shall be corrected according to the altitude correction factor K. For every 2000m of altitude, K=1.13; for an altitude of 3000m, K=1.28.

Model and Its Meaning

L W - 36 126 (W) / T 3150 - 40

L: SF6 Circuit Breaker

W: Outdoor Type

36: Design Serial Number

126: Rated Voltage (kV)

(W): Anti-pollution Type

T: Spring-operated Mechanism

3150: Rated Current (A)

40: Rated Short-Circuit Breaking Current (kA)

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