Product Overview

The product consists of three main components: the circuit breaker itself, the operating mechanism, and the lifting device.

Circuit Breaker Body Structure: The circuit breaker body consists of a conductive circuit, an insulation system, sealing components, and a housing. The entire conductive circuit is formed by connecting the incoming and outgoing busbars, conductive clamps, flexible connectors, and the vacuum arc extinguishing chamber.

This product utilizes SF6 gas insulation. The incoming and outgoing line insulating bushings are made of epoxy resin and silicone rubber, cast as a single unit. To reduce the switch’s footprint while maintaining adequate phase-to-phase insulation clearance, corner bushings are used for phases A and C, ensuring reliable external insulation. Internally, a composite insulation structure is employed, enabling the product to achieve the required insulation level even without SF6 gas filling.

The FTU can be configured for comprehensive use, enabling circuit breakers to provide protective functions while also offering remote telemetry, remote signaling, and remote control capabilities. Multiple circuit breakers can be centrally managed to enhance the response speed of management personnel during faults and to provide corresponding fault data support.

Product Model and Meaning

Terms of Use

1. Ambient air temperature: -40°C to +50°C; daily temperature variation ≤ 25°C. Based on the physical properties of SF6 gas, when the ambient temperature is -40°C and the internal pressure of the enclosure is 0.05 MPa, SF6 remains in the gaseous state, ensuring normal operation of the product. (At an ambient temperature of -40°C and a gauge pressure of 0.05 MPa, the liquefaction point of SF6 is -55°C; at zero gauge pressure, the liquefaction point of SF6 does not exceed -60°C.)

2. Altitude ≤ 2000 m;

3. Wind pressure ≤ 700 Pa (equivalent to a wind speed of 34 m/s);

4. Pollution Degree: Level IV.

5. Locations free from fire, explosion hazards, chemical corrosion, and severe vibrations;

6. Seismic intensity ≤ 8 degrees;

7. Ice thickness ≤ 10 mm.

Main Features

1. It employs a high-performance ceramic vacuum arc extinguishing chamber manufactured domestically; the chamber boasts strong arc-extinguishing capability, high reliability, and a long electrical service life. Moreover, the vacuum arc extinguishing chamber is housed within a semi‑enclosed base made of epoxy resin, which minimizes arc-induced contamination inside the switch during operation.

2. A mature sealing structure is employed. All high‑voltage components, low‑voltage control circuits, and operating mechanisms are housed within a sealed enclosure. The incoming and outgoing line insulation bushings are integrally cast using epoxy resin and silicone rubber; corners are fitted with angled bushings for phases A and C, ensuring excellent insulation performance.

3. It employs a mature spring-operated mechanism that features a refined design, a compact structure, and stable performance, and is equipped with multiple input and output ports for manual, electric energy storage, as well as closing and opening operations; it supports a wide range of voltage levels.

4. Install two‑phase or three‑phase CTs using split‑core current transformers to reduce weight and increase support strength, primarily for overcurrent automatic trip protection and for information analysis by intelligent controllers.

5. The contact between the shaft and sleeve in the main circuit adopts an inward‑retracting, outward‑expanding link chain structure, resulting in low contact resistance and minimal temperature rise in the main circuit.

6. An explosion-proof device is installed on the top of the enclosure, ensuring that no splashing debris will leak out even in the event of an internal fault.

7. Built-in Zero-Sequence Current Transformer: A built‑in three‑phase integrated zero‑sequence current transformer provides accurate zero‑sequence current signals, preventing deviations that may arise from the synthesis of zero‑sequence currents derived from three‑phase current transformers.

8. Circuit breaker closing and opening operations can be performed manually or electrically, as well as remotely. They can be paired with controllers to achieve distribution automation, or they can be combined with recloser controllers to form a recloser.

9. The product is internally filled with SF6 gas at “O” gauge pressure to ensure reliable operation.

10. The circuit breaker can be equipped with a three-phase interlocked isolating switch that features a clearly visible open point when the isolating switch is in the open position, and is fitted with an anti-misoperation interlocking device that ensures proper coordination with the circuit breaker itself. When the circuit breaker is in the closed position, the isolating switch cannot be operated for either opening or closing; the circuit breaker may only be operated when the isolating knife is in the closed or open position. It can be connected to surge arrester post insulators for convenient maintenance.

11. The product has a reasonable structural design and excellent corrosion resistance.

12. Small in size, lightweight, and long-lasting.

Main Technical Parameters

Ordering Instructions

1. When placing an order, please specify the product model. For example, indicate the rated current of the sectionalizing circuit breaker, the rated short-circuit breaking current, the quantity, and the product configuration (such as the current transformer ratio, accuracy, capacity, quantity, and factory‑specified transformation ratio).

2. Users must specify the installation method and select the corresponding mounting bracket and fastening accessories.

3. Users can select the appropriate functional configuration based on their specific requirements, such as whether the GPRS controller, the main body of the sectionalizing circuit breaker, is equipped with an isolating switch, and what spare parts are included.