Description:

HM4 type high voltage indoor SF6 gas circuit breaker with two installation way by drawable/Fixed. which is widely application for three-phase AC power system of rated voltage from 12kV up to 40.5kV at frequency 50/60Hz, especially using for power plant, transformer substation, petrol chemical industry, metallurgy, manufacturing industry, airport, residential area, etc..Its high performance switchgear which will reduce over-voltage and harmonic impulse at max for by a normal or fault breaking or making. 

HM4 circuit-breakers are used in power distribution to control and protect lines, transformer and distribution substations, motors, transformers, capacitor banks, etc.Thanks to the SF6 autopuffer breaking technique,the HM4 circuit-breakers do not generate operating overvoltages, and are therefore also highly suitable for retrofitting, upgrading and enlarging older installations where the motor, cable, etc. insulating materials may be particularly sensitive to dielectric stresses.

Technical feature:

• Advanced breaking technology: Using sulfur hexafluoride (SF6) gas as the arc - extinguishing and insulating medium.Based on the arc - extinguishing principle combining thermal expansion and gas - compression - assisted blowing.Particularly suitable for the switching of capacitive or inductive loads, and its back - to - back capacitor bank breaking current can reach 1250 A (C2 level). 

• Excellent safety performance: Complete mechanical and electrical interlocking devices to prevent misoperation. Standard - equipped mechanical anti - pumping device to avoid conflicts with external electrical anti - pumping functions. Provide two - stage action alarms for low pole - column air pressure and insufficient air pressure, and the option to add a digital display SF6 gas density monitoring device.The sealing life of the pole - column meets the requirements of GB/T 1984 and IEC 62271 - 100, with low maintenance. 

• Scientific material selection and craftsmanship: Select composite insulating materials with excellent flame - retardant performance.Adopt low - toxicity and low - pollution trivalent chromium electroplating.

Main technical data:

Outline dimension drawing:

12kV Indoor SF6 Circuit Breaker

24kV Indoor SF6 Circuit Breaker：

31.5kV Indoor SF6 Circuit Breaker：

40.5kV Indoor SF6 Circuit Breaker：

Q：What is a sf6 circuit breaker used for?

SF6 circuit breakers play a crucial role in safeguarding electrical power stations and distribution systems. They function by interrupting electric currents promptly when triggered by a protective relay. This action effectively prevents potential damage to the electrical infrastructure, ensuring the stable and reliable operation of power supply networks.

Q:What is the purpose of SF6?

Due to its distinctive dielectric properties, electric utilities place a great deal of reliance on SF6 within electric power systems. In the transmission and distribution of electricity, SF6 is crucial for voltage electrical insulation, current interruption, and arc quenching. However, it is also recognized as the most powerful greenhouse gas discovered to date.