Complete internal structure diagram of plastic case circuit breakerThe main contact of the circuit breaker is closed by manual operation. After the main contact is closed, the free release mechanism locks the main contact at the closing position. The thermal element of the thermal release contacts with the free release mechanism. When the circuit is overloaded, the thermal element of the thermal release bends the bimetal sheet, pushes the action of the free release mechanism, and the main contact disconnects the main circuit.

How to check the contact quality of plastic case circuit breaker?Contact resistance varies greatly by environmental impact, such as temperature, humidity and dust, which can affect the contact resistance. Therefore, it is impossible to measure whether the contact has been damaged by a standard resistance value.

Terminological Interpretation of TT, TN and IT Systems for Molded Case Circuit BreakersThe nouns of TT, TN and IT systems of plastic case circuit breakers explain that TT is a protective grounding system, TN is a zero-connection protection system, IT means that there is no grounding or high resistance grounding on the power side, and the load side carries out grounding protection.

The structure of common plastic case circuit breaker and the function of its important components are explained in detail.The commonly used plastic case circuit breakers are mainly frame circuit breakers and air circuit breakers. The structure of frame circuit breakers has different components according to the different functions of products.

Some Common Knowledge to Be Noticed and Understood Before Choosing Molded Case Circuit BreakerBefore choosing the type of plastic case circuit breaker, we should determine how much rated current we need, how to install it, what kind of tripping unit we need, whether we need leakage function, what level and breaking ability.

Design of Arc Extinguishing Chamber and Wiring of DC Molded Case Circuit BreakerThe arc extinguishing chamber is a metal grid type arc extinguishing chamber. Melamine plate is used as insulation plate on both sides, cold rolled steel plate is used as grid, and the chamber is designed with slit and staggered upper and lower. When the arc enters the arc extinguishing chamber and is cut into short arcs in series by grids, each short arc has positive and negative polar voltages. The total arc voltage will increase. When the arc voltage is greater than the recovery voltage between contacts, the arc will extinguish the daughter-in-law.

Difference between Grounding Fault Protection and Residual Current Protection in Plastic Shell Circuit BreakerWith the development of electronic technology, electronic outlet units are widely used in plastic case circuit breakers. At the same time, with the enhancement of people's awareness of personal electric shock and electric fire protection, more attention has been paid to the use of grounding protection function of plastic case circuit breaker. Therefore, the difference between grounding fault protection and residual current protection of plastic case circuit breaker conforming to IEC60947-2 standard is clearer.

Detailed Description of Daily Maintenance of Molded Case Circuit BreakerDaily maintenance of plastic case circuit breaker is the basic work of equipment maintenance. It must be institutionalized and standardized. Regular maintenance work of equipment should be formulated work quota and material consumption quota, and assessed according to the quota. Regular maintenance of plastic case circuit breaker Maintenance work should be included in the assessment of the workshop contractual responsibility system.

Technical Performance of DC Molded Case Circuit BreakerDC plastic case circuit breaker can realize short-circuit current interruption and normal small current interruption under high voltage conditions, without the requirement of positive and negative polarity of DC interruption technology.

Introduction to the Concept of DC Molded Case Circuit BreakerThe concept of DC plastic case circuit breaker: overview, standards, functional characteristics and operating conditions.

Introduction of release characteristics of plastic case circuit breakerExcitation tripping device belongs to one kind of electromagnetic tripping component, which completes the controlled tripping function of circuit breaker by adding electric signals. If the normal power supply circuit needs to be cut off in the state of fire fighting, the circuit breaker can be broken by applying 24VDC signal to the coil of the shunt tripper of the circuit breaker.

How to choose plastic case circuit breaker?With the increasing popularity of plastic case circuit breaker, it involves various fields, even at home. The use of plastic case circuit breakers is even related to people's life safety. They can not be purchased and used at will, nor can they be thrown away directly after they are not like other commodities. Once the quality of plastic case circuit breaker is not up to standard, it will cause serious consequences. ...