LW24-40.5 Series High Voltage SF6 Circuit Breaker

Our LW24-40.5 series outdoor high-voltage SF6 circuit breakers are designed for 35kV power transmission and distribution systems, featuring self-extinguishing arc technology for reduced operating energy and enhanced reliability.

• Rated voltage of 40.5kV with rated current up to 3150A; rated short-circuit breaking current of 31.5kA with peak withstand current up to 100kA for robust fault interruption.

• Self-extinguishing arc principle reduces mechanism operating energy, simplifies structure, and improves product reliability for easy installation.

• Mechanical endurance of 10,000 operations (M2 grade) ensuring long-term reliability for frequent switching applications.

• Superior capacitive switching performance with restrike characteristics grade C2; rated back-to-back capacitor bank breaking current up to 1500A and inrush making current up to 20kA.

• Rated shunt reactor bank breaking current of 1600A; rated cable-charging breaking current of 50A; rated out-of-phase breaking current of 10kA.

• Main circuit resistance ≤40μΩ; rated operating duty of O-0.3s-CO-180s-CO.

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

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Product Overview

The LW24-40.5(G)/T2500(3150)-31.5 sulfur hexafluoride (SF₆) circuit breaker is an outdoor three-phase AC 50Hz high-voltage power transmission and distribution equipment designed for 35kV-level power systems. It is used for making and breaking load currents, interrupting fault currents, or switching lines to achieve control and protection of the power transmission and distribution system. This circuit breaker adopts a self-extinguishing arc principle, which reduces the operating energy required by the mechanism, enhances product reliability, and features a simple structure, compact design, and easy installation.

Technical Specifications

S.Q.	Item	Unit	Between Poles	Across Poles & Pole-to-Earth
1	Rated Short-Duration Power-Frequency Withstand Voltage (1min r.m.s.)	kV	118	Dry Test	Wet Test
				95	85
2	Rated Lightning Impulse Withstand Voltage (1.2/50μs peak)	kV	215	185
3	Power-Frequency Withstand Voltage for Auxiliary and Control Circuits (1min)	V		2000

S.Q.	Item	Unit	Technical Parameter
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	2500(3150)
4	Rated Short-Circuit Breaking Current	kA	31.5
5	Rated Short-Time Withstand Current	kA	40
6	Rated Peak Withstand Current	kA	100
7	Rated Short-Circuit Duration	S	4
8	Rated Short-Circuit Making Current	kA	100
9	Rated Cable-Charging Breaking Current	A	50
10	Rated Out-of-Phase Breaking Current	kA	10
11	Rated Phase-to-Earth Fault Breaking Current	kA	34.8
12	Main Circuit Resistance	times	≤40
13	Rated Operating Sequence	μΩ	O-0.3s-CO-180s-CO
14	Rated Operating Voltage	V	DC110 or DC220
15	Mechanical Operating Endurance	times	10000(M2grade)
16	Stored-Energy Motor Voltage	V	DC220,AC220
17	Weight of SF₆ Gas	kg	5
18	Weight of Circuit Breaker (Including Operating Mechanism)	kg	800
19	Restrike Characteristics During Capacitive Current Switching	grade	C2
20	Rated Back-to-Back Capacitor Bank Breaking Current	A	1500
21	Rated Back-to-Back Capacitor Bank Inrush Making Current	kA	20
22	Rated Shunt Reactor Bank Breaking Current	A	1600

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