Minimum Oil Circuit Breaker
Your Leading Minimum Oil 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 Minimum Oil Circuit Breaker
|
S.Q. |
Item |
Unit |
SW2-601 |
SW2-6311 |
SW2-661Il |
|
|
1 |
Rated Voltage |
KV |
60 |
63 |
66 |
|
|
2 |
Maximum Operating Voltage |
KV |
72.5 |
|||
|
3 |
Rated Current |
A |
630 |
1000 |
1600 |
|
|
4 |
Rated Short-Circuit Breaking Current (RMS) |
KA |
20 |
25 |
31.5 |
|
|
5 |
Rated Short-Circuit Making Current (Peak) |
KA |
50 |
63 |
80 |
|
|
6 |
Rated Short-Time Withstand Current (4s) |
KA |
20 |
25 |
31.5 |
|
|
7 |
Opening Time (Max.) |
S |
0.04 |
0.08 |
0.04 |
|
|
8 |
Closing Time (Max.) |
S |
0.2 |
0.5 |
0.2 |
|
|
9 |
Autoreclosing Dead Time "O" (Min.) |
S |
0.3 |
0.7 |
0.3 |
|
|
10 |
Autoreclosing "Close-Open" Time (Min.) |
S |
0.12 |
0.2 |
0.12 |
|
|
11 |
Rated Operating Sequence |
N |
O - 0s - CO - 180s - CO |
|||
|
12 |
First-Pole-to-Clear Factor |
|
1.5 |
|||
|
13 |
Terminal Static Load |
Horizontal: Longitudinal |
N |
750/750 (Upper Terminal) |
||
|
14 |
Vertical: Up/Down |
N |
750/750 |
|||
|
15 |
Mechanical Endurance |
Times |
2000 |
|||
|
16 |
Circuit Breaker Weight (Pole Unit) |
Kg |
1140 |
|||
|
17 |
Oil Weight per Three Poles |
Kg |
140 |
|||
- It requires a small quality of the oil.
- There is less risk of fire.
- It requires small space since the quality of oil required is less ad a small separation of contact is sufficient to quench the arc.
- Mainteance prolem are reduce.
- The smaller in size the bulk oil circuit breaker.
Minimum Oil Circuit Breakers Mainly Consists of:
Breaker Pole
The primary functions of circuit breaker is interrupting short circuit current and providing necessary insulation between live parts and earthed parts carried out by the breaker pole.
Base frame
The base frame essentially consists of an operating arm to connect the pull rods transmitting motion and houses the opening spring either inside or out side, depending upon type of breaker, which gives required opening speed at the time of contact separation.
Operating mechanism
The operating mechanism mainly consists of a set of closing springs to close the breaker with the required speed, a spring charging motor for charging of the closing springs, limit switch mainly to break and make the power supply to the motor depending upon the position of the closing springs trip/close, coils to trip/close the breaker, control panel, auxiliary switch, levers, set of catches blocking devices etc. for the effective and accurate functioning.
Support structures
The base frame on which the breaker pole rests, is supported at an elevation from the ground as per support structure. The support structures shall be mounted on concrete foundations.
Customization Options
Material: Customizable
Logo: Customizable
Structure: Customizable
MOQ: Customizable
Comparison of Bulk Oil Circuit Breakers and Minimum Oil Circuit Breakers
|
Bulk Oil Circuit Breaker (BOCB) |
Minimum Oil Circuit Breaker (MOCB) |
|
The quantity of oil required is more. |
Only 10% of oil quantity is required. |
|
If requires more space area. |
It requires less space area. |
|
Because of its large size, it is difficult for transportation. |
Easy for transportation. |
|
As the system voltage increases the maintenance cost also increases. |
Low maintenance cost. |
|
Production of carbonization is less. |
The degree of carbonization produced is more severe. |
|
More suitable for frequent operation. |
Less suitable for frequent operation. |
|
It is easy to remove the gases from the contact space in time. |
Difficult to remove the gases from the contact space in time. |
|
This type of circuit breaker is used up to 33kV. |
These can be used up to 132kV. |
Test Methods for Minimum Oil Circuit Breaker
Mechanical Test – It is mechanical ability type test involving the repeated opening and closing of the breaker. A circuit breaker must open and close at the correct speed and perform its designated duty and operation without mechanical failure.
Thermal Test – Thermal tests are carried out to check the thermal behavior of the circuit breakers. The breaker under test deal with the steady-state temperature rises due to the flow of its rated current through its pole in a rated condition. The temperature rise for rated current should not exceed 40° for current less than 800A normal current and 50° for normal value of current 800A and above.
Dielectric Test – These tests are performed to check power frequency and impulse voltage withstand capacity. Power frequency tests are kept on a new circuit breaker; the test voltage changes with a circuit breaker rated voltage.
Short -Circuit Test – Circuit breakers are subjected to sudden short-circuits in short-circuit test laboratories, and oscillograms are taken to know the behavior of the circuit breakers at the time of switching in, during contact breaking and after the arc extinction.
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 minimum oil circuit breaker manufacturers and suppliers in China, also support customized service. Please feel free to buy high quality minimum oil circuit breaker made in China here from our factory. Contact us for more details.
minimum oil circuit breaker, SW2 66 KV Series High Voltage Minimum Oil Circuit Breaker