33kv Pole Mounted Vacuum Circuit Breaker for Overhead Line Fault Isolation and Electrical Utility Network Safety Control

Product Description

Product Description

This outdoor pole mounted vacuum circuit breaker serves as core switchgear for urban and rural overhead distribution networks. The whole unit adopts integrated stainless steel cabinet, equipped with three-phase integrated silicone rubber composite insulating bushings, built-in vacuum interrupter and spring stored energy operating mechanism. The equipment can be directly installed on distribution poles, realizing normal opening & closing of power lines, and rapidly cut off circuit under overload and short-circuit faults to achieve automatic grid protection. Silicone rubber insulating housing features excellent hydrophobic and anti-pollution performance, adapting to complex outdoor open-air working conditions. It is widely used in new rural power grid construction, urban distribution network renovation, photovoltaic and wind power supporting transmission lines, acting as key complete equipment for safe and stable operation of overhead distribution systems.

Outdoor high-voltage automatic recloser device vacuum circuit breaker rated voltage 30KV, 33KV, 36KV and rated current 630A, 1250A, 1600A, three-phase AC 50/60Hz outdoor power distribution equipment. It is mainly used to break and close the power system load current, overload current and short circuit current. 

Environmental Conditions

Ambient temperature: – 40℃~+40℃

Altitude: ≤2000m

Relative humidity: ≤95% (daily average) or ≤90% (monthly average)

Wind speed: ≤34m/s (equivalent to a pressure of 700pa on a cylindrical surface)

Structure and Function

Product Advantages:

Application Scenarios:

- Anti-corrosion Stainless Steel Cabinet: Stainless steel housing resists rainwater, coastal salt fog and industrial acid corrosion, no rust after long-term outdoor service
- Anti-pollution Composite Insulating Bushing: Hydrophobic silicone sheds reduce pollution flashover risk, stable operation in heavy dust and humid areas
- Arc-free Vacuum Interruption: Arc extinguished inside vacuum chamber without open flame or waste gas, low component wear and long service life
- Stable Spring Stored Energy Mechanism: Fast response for opening and closing, low mechanical failure rate and easy maintenance
- Integrated Three-phase Compact Design: Small installation footprint, easy pole mounting with bracket by single worker
- All-weather Super Weather Resistance: Operate stably under high temperature, frost, heavy rain and thunderstorm all year round
- Multi-layer Safety Protection: Automatically break circuit under overload and short-circuit to avoid wire burnout and large-scale power outage
- Long Maintenance-free Operation: No easily worn consumables for core arc-extinguishing parts, no disassembly maintenance required under normal working conditions

As supporting equipment for overhead power grid lines, it fits all kinds of medium voltage overhead distribution projects:
1.Section control and fault protection for main medium voltage overhead lines on urban & rural distribution poles
2.Switchgear for new rural power grid construction and old urban distribution network upgrading projects
3.Protection device for outgoing overhead transmission lines of photovoltaic and wind power stations
4.Outdoor power lines in coastal salt fog, mining dust and chemical industrial heavy corrosion zones
5.Supporting equipment for township industrial parks, agricultural irrigation dedicated lines and long-distance mountain distribution lines 
It can be matched with pole mounting brackets, current transformers, zinc oxide lightning arresters and line fittings to build a complete outdoor power distribution automation system.

Surge Arrester:

Fuse Cutout:

Polymer Insulator:

Protects equipment from lightning and switching overvoltage.

Provides overcurrent and short-circuit protection for overhead lines.

Ensures insulation and mechanical support for pole-mounted equipment.

Specification

No	Item		Unit	Data
1	Rated voltage		kV	12
2	Rated current		A	630
3	1min power frequency withstand voltage	Dry test: phase to phase, ground/fracture	kV	42/48
		Wet test: phase to phase, ground/fracture	kV	34
4	Lightning impulse withstand voltage (peak value) phase to phase, ground/fracture		kV	75/85
5	Rated short circuit breaking current		kV	20/25
6	Rated short circuit making current (peak value)		kA	50/63
7	Rated peak withstand current		kA	50/63
8	4s short-term withstand current		kA	20/25
9	Rated operating sequence		-	O-0.3s-CO-180s-CO
10	Rated short circuit current breaking times		times	30
11	Mechanical life		times	10000
12	Energy storage motor rated voltage		V	DC24
13	Energy storage motor rated power		W	70
14	Rated operating voltage		V	DC24
15	Energy storage time at rated voltage		S	Less than 10
16	Partial discharge of the whole machine		Pc	Less than 10

OEM & ODM Custom Service:

Our factory owns mature complete switchgear production lines, providing full-range customization for overseas projects:
- Mechanism Customization: Adjust stored energy mechanism, install electric operating and remote intelligent control modules
- Housing Customization: Modify cabinet size, add rainproof cover and customize exclusive spray marking
- Accessory Kit Customization: Supply matching metering transformers, earthing switches and intelligent fault indicator assemblies
- Logo Engraving Customization: Print customer brand LOGO, equipment model and certification marks on cabinet surface
- Export Packaging Customization: Thickened moisture-proof wooden cases, neutral export packages and exclusive brand outer cartons available 
Professional electrical technical team tracks drawing confirmation, sample commissioning and mass delivery, supporting stable bulk overseas power equipment orders.

Company Profile

About us

Baoding Sihedan Electric Technology Co., Ltd. is a professional manufacturer of power systems and transmission and distribution line materials, providing diverse solutions for the global energy sector.

Our product includes Power Systems, such as Reclosers, Air Break Switches, Load Break Switches, SF6 and Vacuum Circuit Breakers, and Current Transformers (CTs) and Voltage Transformers (VTs); Insulators & Surge Protection, including Insulators, Surge Arresters, and Drop-out Fuses; Electric Power Fittings, such as Overhead Line Fittings, Stay Materials, Steel Structures, and Earthing Materials; and Enclosures & Switchgears, including Enclosures and Switchgears, offering a complete range of solutions for transmission, distribution, and industrial power applications.

 

To support our product quality, we provide warranty letters and test reports for all products. Additionally, we offer virtual maintenance services, ensuring timely support and expert guidance for our clients, wherever they are.We have successfully contributed to major domestic and international power projects, earning long-term trust from the State Grid Corporation of China and China Southern Power Grid Company, among other leading organizations.

Main products

Packing & Delivery

FAQ

Q1: Are you a factory or a trading company?
A: We are a professional manufacturer with our own production workshop and complete testing equipment.

Q2:Can you provide samples? Are the samples free?
A: Samples are available, but not free of charge; the sample fee and freight cost shall be borne by the buyer.

Q3:How long is the warranty period of the products?
A: We provide a 1-5 year warranty against manufacturing defects, starting from the date of shipment.

Q4:EPC material design and bulk supply?

A:Yes, we have a strong design team and have been supplying LV and MV EPC materials in bulk for many years.

Q5:Complete documents for tender?

A:Yes, a complete set of documents is ready for submission.

Q6: Can you do OEM with our brand?
A: Yes, we accept OEM customization with your logo, brand, and packaging.

Q7:What kind of packaging do you use for the products?
A: Standard export pallets with waterproof and moisture-proof treatment, suitable for long-distance ocean transportation.

 

Q8: What payment methods do you accept?

A:  1. 30% T/T in advance, 70% T/T against copy of B/L(Bill of Lading)

      2. 30% T/T in advance, 70% by L/C                                                                             

 

Q9: What shipping options do you provide, and what are the typical lead times for delivery? 

A:Sea Freight, and the lead times is about 15-30 days.