Sulfur Hexafluoride (SF6) Circuit Breaker
Your Leading Sulfur Hexafluoride (SF6) Circuit Breaker Supplier
Trust In Grid Co., Ltd. is a professional transformer manufacturer, specializing in the design and production of power transformer, high-voltage switchgear, power distribution equipment, energy storage systems (ESS), magnetic wire, bushing and machining parts. Our power transformers are available in 500KV, 330KV, 220KV, and 110KV models, and are widely used in power utilities, renewable energy systems (solar and wind), industrial facilities, data centers, transportation infrastructure, and OEM applications.
Why Choose Us?
Production Capacity
With 6 factories covering 240,000 m², over 2,000 employees, and 200+ engineers, we support large-scale projects and long-term global supply with more than 30 years of export experience.
Advanced Equipment
We operate a complete set of in-house production equipment, including cutting, winding, CNC machining, vacuum drying, and testing systems, with over 450 machines ensuring stable quality and efficient output.
Quality Control
All products are manufactured and tested in compliance with IEC, IEEE, ANSI, CSA, UL/cUL, CE, and ISO 9001:2015 standards, ensuring reliable performance and smooth international approval.
OEM & ODM Capability
Our engineering team provides OEM/ODM support, including customized design and technical optimization, delivering tailored solutions for utility, industrial, and renewable energy projects.
Technical Specifications of Sulfur Hexafluoride (SF6) Circuit Breaker
|
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 |
|||
Superior Insulation Properties: SF6 has a much higher dielectric strength than air or oil, allowing it to withstand high voltage levels without breaking down. This makes it ideal for use in compact circuit breakers designed for high-voltage applications.
Efficient Arc Quenching: When an electrical arc forms due to a fault, SF6 gas absorbs the arc energy and rapidly cools it down. This interrupts the current flow and prevents further damage to the electrical system.
Thermal Stability: SF6 gas remains stable even under extreme temperatures and pressure variations, ensuring consistent performance in different environmental conditions.
Self-Healing Capability: After extinguishing an arc, SF6 gas quickly recombines back into its original molecular form, making it highly reusable and effective for prolonged operation.
Non-Flammable and Non-Toxic: Unlike oil-based breakers, SF6 circuit breakers eliminate the risk of fire hazards and contamination, making them safer for use in high-voltage applications.
Inside a typical high‑voltage SF6 breaker, you' ll find:
Main contacts – Carry normal load current with low resistance.
Arcing contacts – Take the brunt of the arc during opening to protect the main contacts.
Nozzles – Shape and accelerate the SF6 gas flow directly through the arc zone.
Puffer cylinder or chamber – Compresses gas in puffer‑type SF6 breaker designs.
Interrupting tank/pole column – Sealed housing filled with SF6 gas, maintaining the required SF6 gas pressure in the circuit breaker.
Operating mechanism – Spring, hydraulic, or motor‑charged system that opens and closes the contacts at high speed.
Customization Options
Material: Customizable
Logo: Customizable
Structure: Customizable
MOQ: Customizable
Quick Comparison of Sulfur Hexafluoride (SF6) Circuit Breaker with Other Circuit Breaker Types
To put SF6 circuit breaker applications in context, here' s how they compare to other common technologies:
|
Type |
Typical Use Range |
Main Medium |
Key Points |
|
SF6 circuit breaker |
~72.5 kV up to 800+ kV |
SF6 gas |
Dominant in high voltage, AIS and GIS, compact and reliable |
|
Vacuum breaker |
~1 kV to 38–72 kV (MV) |
Vacuum |
Excellent for medium voltage, greener, smaller duty at EHV |
|
Air-blast breaker |
Legacy HV installations |
Compressed air |
No longer popular; noisy, bulky, higher maintenance |
|
Oil circuit breaker |
Old MV/HV substations |
Mineral oil |
Largely replaced by SF6 and vacuum due to fire and maintenance issues |
Ordering Process
Send Us Inquiry → Receive Our Quotation → Negotiate Details → Confirm the Sample → Sign Contract/Deposit → Mass Production →cargo Ready → Balance/Delivery → Further Cooperation
Payment Terms
T.T with 30% downpayment, 70%before shipment.
Paypal or West Union also accept.
Our Service Highlights
Pre-Sales Consultation & Design Support
Early technical engagement to define requirements and deliver optimized solutions.
During Sales & Project Execution
Transparent project management with controlled production, quality tracking, and on-time delivery.
Warranty Advantage
Minimum 2-year warranty on all products, ensuring reliable and risk-free operation.
After-Sales Support
24/7 technical support with fast response, spare parts availability, and training services.
Long-Term Partnership
Lifelong technical support and upgrade guidance for sustained performance.
Packaging & Shipping
Packaging details:
Shockproof foam/moisture-proof film, professional export cartons/wooden crates/pallets.
Final assembly ensures mechanical integrity and readiness for transportation and installation.
Certificates
We're well-known as one of the leading sulfur hexafluoride (sf6) circuit breaker manufacturers and suppliers in China, also support customized service. Please feel free to buy high quality sulfur hexafluoride (sf6) circuit breaker made in China here from our factory. Contact us for more details.
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