QJ-MW1-4000/4P/3600A Fixed Universal Circuit Breaker Qijun Electric Technology Introduction:

Function introduction of universal circuit breaker: The circuit breaker is arranged in a three-dimensional form, and the contact system, instantaneous overcurrent release, and left and right side plates are all installed on an insulation board. The upper part is equipped with an arc extinguishing system, and the operating mechanism can be installed in the front or right side, with "open" and "close" indicators and a manual disconnect button. It is equipped with a shunt release on the upper left and an undervoltage release connected to the release half shaft on the back. The speed saturation current transformer or current voltage converter is mounted on the lower busbar. Undervoltage delay devices, thermal relays, or semiconductor release devices can be installed below. DW15-2000、 The 3200, 4000, and 6300 circuit breakers are arranged in a three-dimensional form, consisting of a frame, side panels, and crossbeams. Each phase contact system is installed on the frame, with an arc extinguishing chamber installed on top. The operating mechanism is located on the right front of the circuit breaker and is connected to the contact system through the main shaft. The electric operating mechanism is integrated with the mechanism through a square shaft and installed at the lower part of the circuit breaker. It is used for energy storage or direct closure of the circuit breaker, and the closure after energy storage is carried out by the release electromagnet. An anti bounce mechanism is installed above the left side panel to prevent the circuit breaker from bouncing when disconnected. Various overcurrent release devices are installed below the circuit breaker according to different requirements, while undervoltage, shunt release devices, and electric operation control parts are installed on the left side. The undervoltage and shunt release devices are connected to the amplification mechanism through the release device to reduce the tripping force of the circuit breaker. 12 pairs of auxiliary contacts are provided for users to connect the secondary circuit. The panel has indicator signs "1", "0" and "energy storage" indicating the working position of the circuit breaker, as well as buttons "1" and "0" for closing and opening (all pressed). DW15-1000、 The 1600 circuit breaker is equipped with a front manual operation handle; DW15-2500、 The 4000 comes with a manual operation handle for maintenance (both can be removed).

QJ-MW1-4000/4P/3600A Fixed Universal Circuit Breaker Qijun Electrical Technology Structural Features:

The intelligent universal circuit breaker is suitable for distribution networks with AC 50Hz, rated voltage of 380V, 660V, and rated current of 200A-6300A. It is mainly used to distribute electrical energy and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The circuit breaker has multiple intelligent protection functions, can achieve selective protection, has precise action, avoids unnecessary power outages, and improves power supply reliability. Under normal conditions, it can be used for infrequent switching of lines. Circuit breakers below 1250A can be used to protect motors from overload and short circuit in AC 50Hz voltage 380V networks. Under normal conditions, it can also be used for infrequent starting of electric motors.

QJ-MW1-4000/4P/3600A Fixed Universal Circuit Breaker Qijun Electric Technology Operating Environment:

1. The upper limit of the surrounding air temperature shall not exceed+40 ℃, the lower limit shall not be lower than -5 ℃, and the average value over 24 hours shall not exceed+35 ℃.
2. The installation location shall not exceed an altitude of 2000m.
3. The relative humidity of the atmosphere shall not exceed 50% when the ambient air temperature is+40 ℃; At lower temperatures, there can be higher relative humidity; The monthly average maximum relative humidity of the wettest month is 90%, and the monthly average minimum temperature of that month is+25 ℃, taking into account the condensation that occurs on the surface of the product due to temperature changes.
4. Pollution level: Level 3
5. Installation conditions: Can be installed vertically or horizontally

6. Installation category: The main circuit of the circuit breaker and the undervoltage vent are connected, and the installation category of the primary coil of the power transformer is IV. The installation category of other auxiliary circuits and control circuits is III.

Customer Case

Qinshan Nuclear Power Plant Three Gorges Dam Project Beijing Shanghai High speed Railway Project

China Petroleum Ansteel Pangang

Bank of China South to North Water Diversion Project Daqing Oilfield

Ping An Insurance Changan Automobile Volkswagen

Capital Airport, Shenzhen Stock Exchange, Shanghai World Trade Center, etc

application area