PGS-12/24/35 Series Outdoor SF6 Load Break Switches-Chennuo Electric Technology Group Co., Ltd

Feature

Integrated Three-Phase Enclosed Structure:The switch adopts a compact three-phase integrated design, with the main circuit and operating mechanism housed within a single sealed enclosure, improving reliability and reducing maintenance needs.

SF₆ Gas Insulation with Sealed Tank Design:The internal chamber is filled with SF₆ gas and uses a fully sealed tank structure, ensuring excellent insulation performance, arc-extinguishing capability, and long-term operational stability.

External Silicone Rubber Insulators:High-performance silicone rubber bushings are used for external insulation, offering strong resistance to pollution, UV exposure, and harsh outdoor environmental conditions.

Modular Operating Mechanism with Visible Isolation Function:The switch features a mechanical linkage system that enables clear open/close status indication and supports coordinated operation with isolation and grounding functions, enhancing safety and operational clarity.

Parameter

Serial number	Parameter name	Unit	Parameter
1	Rated voltage	kV	12 / 24 / 40.5
2	Rated frequency	Hz	50 / 60
3	Rated current	A	630
4	Rated breaking load current (0.15 MPa / 20°C)	A	630
5	Breaking current at zero gauge pressure	A	630
6	Peak withstand current	kA	50
7	Rated short-time making current	kA	50
8	Rated short-time withstand current	kA/s	20 / 4
9	Current transformer parameters	A	600 / 5

Operating Environment Conditions：

System Voltage Compatibility: Designed for three-phase AC power networks with a rated voltage of 40.5kV and below (specifically targeting 12/24/40.5kV and below terminal power supply users).
Environmental Adaptability: Features a high-quality stainless steel stamped enclosure with mechanical hand welding, filled with low-pressure SF6 gas and equipped with a low-gas-pressure protection sensor to prevent accidents caused by low-pressure operations.
Flexible Outlet Configurations: To adapt to diverse working environments, the switch can be configured with multiple outlet methods, including porcelain bushing type, composite bushing type, porcelain bushing cable type, and composite bushing cable type.

Typical Application Scenarios：

Terminal Power Supply Users: Developed specifically for 12/24/40.5kV and below terminal power supply users.
Capacitor Compensation & Power Generation: Widely applied for power capacitor reactive compensation and small power generation enterprises.
Distribution Networks & Overhead Lines: Applicable in three-phase AC power networks for opening and closing load currents and overload currents.
Substation Automation & "Watchdog" Applications: With its large internal space allowing the installation of multiple current and voltage sensors, it can be paired with special control devices as a 35kV and below class "watchdog" to effectively distinguish internal and external ground faults.

Key Features & Technical Advantages：

Compact & Cost-Effective: Offers significant advantages such as a small footprint, quick installation, low engineering cost, and ease of use.
Lifelong Maintenance-Free Design: Adopts a three-phase common-box structure where both the main circuit and mechanism are enclosed within a single tank, ensuring the switch is maintenance-free throughout its lifecycle.
Smart Fuse Coordination: When paired with fuses and an electric mechanism using a special imported control device, it can automatically judge fuse blowing, trip the load breaker, and isolate faulty line segments to prevent phase failure accidents (with drop-out fuses also serving as visible disconnection points).
Enhanced Safety Protections: Outfitted with an enclosure made of high-quality stamped stainless steel, low-pressure SF6 gas, and a low-gas-pressure protection sensor to safeguard operational safety.

Frequently Asked Questions (FAQ)

Q1: What voltage levels does the PGS series outdoor load break switch support?
A: The series is designed for 12/24/40.5kV and below power distribution systems and terminal supply users.

Q2: Can this load switch be used as a "watchdog" device to detect faults?
A: Yes. Because of its special structure and large internal space, it can accommodate multiple current and voltage sensors, allowing it to function as a 35kV and below "watchdog" to effectively differentiate between internal and external ground faults.

Q3: How does the switch handle low SF6 gas pressure risks?
A: The unit is filled with low-pressure SF6 gas and is equipped with a dedicated low-gas-pressure protection sensor designed to prevent any operational safety accidents caused by low pressure.

Q4: Is regular internal maintenance required for the PGS switch?
A: No. It utilizes a three-phase common-box structure that seals both the main circuit and mechanism inside a single tank, achieving lifelong maintenance-free performance.