SF6 LW36-40.5 Outdoor Vacuum Circuit Breaker | High Voltage Protection | Chennuo Electric-Chennuo Electric Technology Group Co., Ltd

Feature

Reliable Breaking Performance: Adopts auto--expansion arc-extinguishing technology, enabling continuous breaking of 40.5kA short-circuit currents up to 22 times without overhaul. The arc-extinguishing chamber valve pieces are made of special high-temperature resistant, lightweight alloy materials, offering more stable and reliable gas flow characteristics compared to traditional materials.

Advanced Nozzle Construction: The nozzle is composed of PTFE (polytetrafluoroethylene) with trace additives, ensuring stable breaking performance and strong anti-burning capabilities.

Superior Insulation & Sealing: External insulation creepage distance >31mm/kV with high pollution resistance, suitable for safe operation in harsh environments up to 3000m altitude. The SF6 gas annual leakage rate is far below 0.5%, backed by strict moisture-removal manufacturing processes that keep SF6 water content extremely low.

Robust Mechanical Durability: Features a low operating power, lightweight, low-noise spring operating mechanism with zero leakage. Important internal components are forged from alloy steel with high strength and wear resistance to ensure low failure rates during frequent operations.

Corrosion-Resistant Exterior: Built with a compact, novel appearance, utilizing a thick steel-plate bent mounting base treated with hot-dip galvanizing, high-strength hot-dip galvanized external fasteners, stainless steel/aluminum transmission rods, and a stainless steel mechanism cabinet for outstanding anti-corrosion performance.

Parameter

Tech. parameters		Parameter value
Rated voltage		40.5
Rated frequency		50/60
Rated current		1000/1250/1600/2000/2500/3150/4000
Rated short circuit breaking current		25	31.5	40
Rated short-circuit switching current (peak value)		60	80	0
Rated short circuit withstand current (Thermal current)		25	31.5	40
Rated peak withstand current (Thermal current)		63	80	100
Rated out-of-phase breaking current		6.3	8	10
Cumulative breaking times under rated short-circuit breaking current		30
Rated short circuit duration		4
Rated lightning impulse withstand voltage	phase-ground, interphase	185
	between fractures	215
Rated 1min power frequency withstand voltage	phase-ground, interphase	95
	between fractures	118
Rated operating sequence		O-0.3s-CO-180-CO
Closing time		≤100
Opening time		≤50
Breaking time		≤50
Close-open time		≤60
Closing synchronicity		≤3
Opening synchronicity		≤2
Closing coil, opening coil voltage		DC:220/110
Energy storage motor voltage		AC:220/110 DC:220/110
Single loop resistance		≤70
Rated SF6 other pressures		0.45
Annual gas leakage of SF6 gas		≤5%
SF6 gas moisture content		≤150
Radio interference level		≤2500
Mechanical life		10000

Operating Environment Conditions：

Altitude: ≤3000m.
Ambient Temperature: -30℃~40℃.
Pollution Level: Class II, Class III, and Class IV.
Relative Humidity: Daily average not exceeding 95%, monthly average not exceeding 90% (25℃).
Wind Pressure: Not exceeding 700Pa(equivalent to 34m/s).
Surrounding Atmosphere: Locations free from flammable substances, explosion hazards, chemical corrosion, and severe regular vibrations.

Why Choose Chennuo Electric?

Proven Maintenance-Free Capacity: Capable of handling multiple heavy short-circuit interruptions (22 times at 40.5kA) without maintenance, lowering operational downtime.
Extended Mechanical Life: Continuous mechanical operation life reaches 6,000 cycles, and can exceed 10,000 cycles after simple adjustments, ensuring high operational reliability.
Strict International Compliance: Manufactured in strict accordance with national GB and international IEC standards for high-voltage circuit breakers.
Extreme Weather Resilience: Designed for Class II to IV pollution levels, high altitudes (≤3000m), and superior anti-corrosion stainless steel construction.

Frequently Asked Questions (FAQ)

Q1: What power systems are suitable for the LW36-40.5kV SF6 circuit breaker?
A: It is designed as a three-phase AC 50Hz outdoor high-voltage electrical device tailored for the control and protection of 35kV transmission and distribution systems, as well as tie-breakers and capacitor bank switching applications.

Q2: What type of operating mechanism does this SF6 circuit breaker use?
A: This series of circuit breakers matches with a CT14 type spring operating mechanism characterized by low operating power, lightweight, low noise, and zero leakage.

Q3: How durable is the arc-extinguishing performance under short-circuit conditions?
A: Thanks to the auto-expansion arc-extinguishing technology and special alloy valve pieces, it can continuously break 40.5kA short-circuit currents up to 22 times without requiring an overhaul.

Q4: How does the LW36 ensure sealing reliability and low gas leakage?
A: The product undergoes strict moisture-removal processes during manufacturing, resulting in an SF6 water content far lower than similar products, ensuring an annual gas leakage rate far below 0.5%.