The basic principle of the moulded case circuit breaker

Plastic case circuit breaker is generally composed of touch system software, magnetic blowing system software, the actual operating mechanism, circuit breaker, housing, etc.

When a fault occurs in the short circuit, the electromagnetic field caused by the high current (generally 10-12 times) gets rid of the anti-twist spring, the circuit breaker drives the students to actually operate the management mechanism, the power control switch is instantly disconnected. When the load, the current is expanded through, heat is elevated, resistance band deformation in our certain economic level to drive the financial institution as well as run (the larger the current, the less time between runs).

At present, there is a wide range of electronic equipment, using voltage transformers to collect the current size of each phase and compare it with the rated value. When the current is abnormal, the microcontroller sends a signal to inform the electronics to drive the actual operating mechanism.

The role of the moulded case circuit breaker is to break and connect the load circuit, disconnect common fault circuits, avoid the expansion of safety incidents and ensure safe operation. The vacuum circuit breaker should be disconnected at 1500V and 1500-2000A current, which can be extended to 2m and then ignited. Therefore, blowing magnetism is a problem that must be solved in vacuum circuit breakers.

The mechanism of arc extinguishing is mainly due to cooling the arc into weak heat dissipation. On the other hand, according to the blowing arc to elongate the arc, strengthen the compound and diffusion of charged particles, so that the charged particles are dispersed in the arc gap and quickly repair the compressive strength of the material insulation layer.

Low-voltage circuit breakers have the advantage of being commonly used by companies through various safety protection roles (load, short-circuit faults, undervoltage, etc.), adjustable posture values, high breaking capacity, more convenient and safe to actually carry out the operation. The low-voltage circuit breaker consists of the actual working operation management mechanism, contacts, protection network equipment (various forms of various buckles), magnetic blowing system design software, etc.

Low-voltage circuit breakers, also known as automatic air switches, can be used to connect and disconnect load circuits and also to operate motors that are not frequently started. Its function is equivalent to a knife switch, an automotive overcurrent relay, an automotive overvoltage relay, a thermal relay, a leakage circuit breaker and other components or the sum of all functions, and is a key protective household appliance in the distribution room network.

The main contacts of the low voltage circuit breaker are manually operated or electrically switched off. An optional fastening mechanism locks the main contacts in the closed section after they have been closed. The solenoid coil of the overcurrent buckle and the thermal element of the thermal buckle are connected in series with the main circuit and the solenoid coil of the undervoltage protection buckle is connected in parallel with the power supply. When a short circuit fault occurs in the circuit or when the load is more serious, the overcurrent button is connected to the suction iron so that any button mechanism operates and the main contact disconnects the main circuit. When the circuit is loaded, the hot element of the hot button bends the bimetal plate, facilitating the operation of the random button mechanism. When the circuit is below voltage, the connecting iron of the voltage button is released. It also allows the operation of the random button mechanism. Separate out the buckle as a remote control operation, normal operation, the electromagnetic coil disconnection, must be distance control, press and hold the operating button, so that the electromagnetic coil plug, connecting iron to promote the operation of any buckle mechanism, disconnect the main contact.