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Precautions for leakage circuit breakers
Installation 1. Before installation, check whether the data on the nameplate of the leakage circuit breaker is consistent with the usage requirements. 2. Do not install too close to the high-current bus and AC contactor. 3. When the operating current of the leakage circuit breaker is greater tha...Read more -
What is a smart circuit breaker ?
The intelligent circuit breaker mechanism is located on the front of the circuit breaker. The mechanism adopts a five-bar linkage free release mechanism and is designed in the form of energy storage. During the use of the smart circuit breaker, the mechanism is always in the pre-energy storage p...Read more -
Overview of AC contactor
AC contactors often use three arc extinguishing methods: double-fault electric arc extinguishing, longitudinal slit arc extinguishing and grid arc extinguishing. It is used to eliminate the arc generated by the moving and static contacts in the opening and closing process. Contactors with a capa...Read more -
Function of isolation switch
Features 1. After opening, establish a reliable insulation gap, and separate the equipment or lines that need to be overhauled from the power supply with an obvious disconnection point to ensure the safety of overhaul personnel and equipment . 2. Change lines according to operational needs. 3. I...Read more -
Detailed introduction of contactor
As an electromagnetic relay commonly used in electrical control systems, contactors have many specifications. Generally, the contactor controls the closing and breaking of the main contact by controlling the energization and de-energization of its coil. We will find that the voltage specification...Read more -
The difference between circuit breaker and MCB
The circuit breaker uses air as a medium for arc extinguishing, so it is also called an air-type low-voltage circuit breaker. Because of its convenient operation and high safety electronic products worldwide, most of the power distribution in the building at home is air switch. The circuit break...Read more -
What are the levels of current transformers
The accurate level of the current transformer is the measurement error (zhi accuracy) dao of du, generally 0.2, inner 0.5, 1.0, 0.2S, 0.5S, 5P, 10P, etc. S is a special capacitor current transformer, which requires high enough accuracy within the load range of 1%-120%. Generally, the error of me...Read more -
The design points of miniature circuit breaker
⑴ The coordination of circuit breaker and circuit breaker should consider the instantaneous release action value of the upper-level circuit breaker, which should be greater than the maximum expected short-circuit current at the outlet end of the lower-level circuit breaker. If the short-circuit ...Read more -
Meet you at the 128th Canton Fair Online 2020
The 128th Canton Fair Online 15th-24th Oct,2020,We sincerely invite you to visit our online booth and watch our live show. Here is our link: https://ex.cantonfair.org.cn/pc/en/exhibitor/4ab00000-005f-5254-e6d3-08d7ed797017/liveRead more -
What is a fully insulated inflatable cabinet?
The fully insulated is to seal the 10KV primary charged high-voltage components such as busbars, circuit breakers, isolating switches, transformers, etc. in a lower pressure (0.1～0.5mpa) sf6 gas, using the chemical of inert gas when sulfur hexafluoride gas is used. Nature, strong stability, str...Read more -
The working principle of AC contactor
The working principle of the AC contactor is to use the electromagnetic force and the spring force to cooperate to realize the connection and breaking of the contact. AC contactors have two working states: power-off state (release state) and power-on state (action state). When the attracting coi...Read more -
Introduction to Molded Case Circuit Breakers
Molded case circuit breakers are also called device circuit breakers. All parts are sealed in a plastic case. The auxiliary contacts, undervoltage releases and shunt releases are mostly modularized. Due to the very compact structure, the molded case circuit breaker is basically impossible to rep...Read more -
Introduction to Time Relay
Introduction to Time Relay Thetime relay is a very important component in the electrical control system. In many control systems, it is necessary to use the time relay to achieve delay control. The time relay is an automatic control electrical appliance that uses the principle of electromagnetic...Read more -
Introduction of low voltage circuit breaker
Low-voltage circuit breakers are also called automatic air switches or automatic air circuit breakers, or circuit breakers for short. It is an electrical appliance that not only has the function of a manual switch, but also can automatically protect against loss of voltage, under voltage, overloa...Read more -
Why does the low-voltage circuit breaker fail to operate
The operation failure of the low-voltage circuit breaker is manifested by dragging or misoperation of the circuit breaker. Because the most basic and important function of a high-voltage circuit breaker is to act correctly and quickly remove grid faults. If the circuit breaker is dragged or move...Read more -
Insulation accident of low voltage circuit breaker
Low-voltage circuit breaker insulation accidents can be divided into internal insulation accidents and external insulation accidents. The harm caused by internal insulation accidents is usually greater than that of external insulation. 1. Internal insulation accident Internal insulation accident...Read more -
A Letter To Customers
A letter to our customers: At the beginning of the Chinese New Year Spring Festival, China was shrouded in sudden new coronavirus. This epidemic virus has seriously affected our daily lives, disrupted our normal work and threatened our lives. But under the leadership of our great country, the 1.4...Read more -
Happy Chinese New Year
Dear Sir/Madam, Thank you for giving our company support in this year. The Chinese traditional Spring Festival is coming, We will have a vacation from Jan 17 to Feb 2, 2020.Sorry for any inconvenience caused. During this time,if you have any need,pls kindly send email（sales@changangroup.com.cn）...Read more