The plastic shell section can automatically cut off the current after the current exceeds the escape settings.Plastic shell refers to the shell of the device with a plastic insulator to isolate the conductor and the ground metal part.Plastic shell circuit breakers usually contain a therm magnetic escape units, and large -scale plastic shell circuit breakers are equipped with solid -state -free sensors.Its deduction unit is divided into: thermomaging deduction and electron deduction.Commonly used, the rated current has the following types of 15 25 30 40 50 60 75 80 100 125 200 225 250 350 350 400 500 63
Plastic shell circuit breaker working principle
[1] The main contact of the low -voltage circuit breaker is manually operated or electric closure.After the main contact is closed, the free deduction agency locks the main contact on the position of the gate.The coils of the over -current deprivor and the thermal element of the thermal device connect with the main circuit, and the coils and power of the underlying voltage deedr are connected parallel.[2] When the circuit has a short -circuit or severe overload, the descendants of the over -current deduction deductor are absorbed, so that the free deduction mechanism moves, and the main point is disconnected from the main circuit.[3] When the circuit is overloaded, the thermal elements of the thermal deduction device are bent on the dual metal sheet to promote the movement of the free deduction mechanism, and the main point is disconnected from the main circuit.[4] When the circuit is under voltage, the launch of the arbitration of the lack of the voltage offerler also causes the free -deduction mechanism to move the movement, and the main contact point disconnects the main circuit.
The difference between plastic shell circuit breakers and micro circuit breakers
Micro -broken circuit breakers and plastic shells are the same as the working principle of circuit breakers.The difference is: 1. Micro -broken circuit breaker installation method is the installation of the rail, and the plastic shell circuit breaker is screw installation; 2. The maximum current level of the micro -circuit breaker is within 63A, and the current level of the plastic shell circuit breaker has a maximum of 2000A.
The difference between the framework of the frame and the plastic shell railway
The plastic shell breakfast is suitable for all parts of the branch protection switch frame breaker. All parts of the circuit breaker are installed in an insulating metal frame. It is often open. It can be installed with multiple accessories. It is more convenient to replace the contact and components.Terminal switch.Overclaimer is electromagnetic, electronic and intelligent deedr.The circuit breaker has four sections: long -delay, short -delay, instantaneous, and grounding faults. Each protection is adjusted within a certain range according to its shell rack level.There are manual and electric operations. With the development of microelectronics technology, some intelligent circuit breakers currently have regional selection chain functions, which fully guarantees the sensitivity and selectivity of the action.The frame -breaking capacity is high in sectional capacity and the function is perfect. The plastic shell broken circuit breaker adopts plasticized structure. It is characterized by compression of the circuit breaker shell and framework with plastic., Ensure that the arc is ejected upwards, ensuring the reliability of the tentacle system.
Plastic shell circuit breaker selection
Second, the selection method of plastic shell circuit breakers is based on the type of load: the first is divided into power distribution system and electric motor maintenance.Based on the capacity of the load: select the additional current of the plastic shell cutter is greater than the load operating current.Selected according to short -circuit current: The additional short -circuit breaking of the plastic shell rallifier can be greater than the expected short -circuit current value.Only the short -circuit breaking of the plastic shell circuit breaker can determine the reliability of the circuit breaker, but to ensure the safety of the line, you do not need to seek high breaks to form a spoil.
Plastic shell circuit breaker model
The DZ5 series plastic shell -type circuit breaker is suitable for AC circuits with 50Hz, 380V, and rated current from 0.15 to 50A.Protecting the electric motor to protect the overload and short circuit of the motor. The circuit breaker is used in the distribution network to distribute the power and the overload and short -circuit protection of the line and the power supply equipment in the power distribution network.The non -frequent conversion of the line.DZ10 series plastic shell circuit breakers are suitable for communication lines, 380V, or DC 220V and below.Putting on the line.

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