What is the difference between a tripper contactor and a circuit breaker?

The tripper is the internal mechanism of the switch, circuit breaker, and relay, and is an actuator.

Contactors. It is the main circuit component, which is generally used with buttons, and can also be used with other low-voltage electrical appliances.

Cluster star triangle decompression starter and other functions.

The circuit breaker is a product with functions such as overload, short circuit, isolation, etc., and can be attached to the functions of leakage, undervoltage, remote control, etc.

The tripper is a mechanism in the switch circuit breaker or thermal relay, which is commonly said to trigger the mechanism to trip when the certain amount of the monitoring circuit reaches a certain level, in order to control the breaking of the circuit.

Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used in electricity, power distribution and consumption. Contactor in a broad sense refers to the electrical appliances that use the current flowing through the coil to generate a magnetic field and close the contact to control the load in industrial electricity.

Circuit breaker refers to a switchgear that can close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use, and the division of high and low voltage boundaries is relatively blurred, and generally more than 3kV is called high-voltage electrical appliances.

The circuit breaker can be used to distribute electric energy, start the asynchronous motor infrequently, protect the power supply line and the motor, and automatically cut off the circuit when they have serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switch and over/underheat relay.

1. The low-voltage circuit breaker shunt tripper, as the name suggests, is used to break the switch, when the shunt tripping coil is passed through the rated voltage, the circuit breaker is opened.

2. The under-voltage tripper is used for under-voltage protection, when the line power supply voltage is lower than the voltage of the under-voltage tripper, the circuit breaker will automatically open and re-close when the call comes again.

3. Electromagnetic tripper is a kind of tripper, which only provides magnetic protection, that is, short-circuit protection.

4. The function of the thermal tripper is mainly used to protect the overload of the circuit breaker, when the circuit breaker is overloaded, the thermal trip action will disconnect the circuit breaker.

The above kinds of trippers, an ordinary universal circuit breaker have these protection functions.

It includes two functions: thermal tripping and electromagnetic tripping. Thermal tripping is a tripping transmission mechanism that pushes the tripping transmission mechanism through the overcurrent delay and heating deformation of the bimetal sheet; Magnetic tripping is the instantaneous propulsion of an armature by the short-circuit current of the electromagnetic coil to drive the trip.

Electronic trip]:

All of the above functions can be performed, and tuning can be carried out conveniently. The electronic tripper is a circuit composed of electronic components, detects the current of the main circuit, amplifies and pushes the tripping mechanism.

Differences]: The former has stable performance and is not affected by voltage fluctuations, has a long life, low sensitivity, and is not easy to set;

The latter has perfect functions, high sensitivity, easy setting, is affected by power supply, and is slightly damaged. The electronic tripper of the circuit breaker is quick-break protection (short circuit, grounding, etc.), and the thermal-magnetic tripper of the circuit breaker is overload protection (overcurrent, etc.).

1. Different uses:

1) The electronic tripper is a leakage protector that detects the current of the main circuit, amplifies and pushes.

2) The duplex tripper, also known as the thermomagnetic tripper, mainly provides magnetic protection and thermal protection, and thermal protection is overload protection.

2. The working principle is different

1) Electronic tripper: When the line has leakage or personal electric shock, the vector sum of the current through the zero sequence current transformer is not equal to zero, the voltage is generated on both sides of the secondary coil of the transformer, and amplified by the integrated circuit, when the setting value is reached, the power supply is cut off within seconds through the leakage tripper, so as to play the role of electric shock and leakage protection.

2) Thermomagnetic tripper: When the current passes through the tripper, the heating element heats up (the direct heating current directly passes through the bimetal sheet), and the bimetal sheet is heated and deformed, and when the deformation reaches a certain extent, it hits the drawbar to drive the mechanism to act and cut off the circuit.

Generally speaking, thermomagnetic trippers are used in circuits to provide short-circuit and overload protection, and only in some special occasions electromagnetic trippers are used to provide short-circuit protection, and other components (such as thermal relays) provide overload protection.

3. Different characteristics:

1) The advantage of the electronic tripper is that it can provide three-stage or even four-stage protection; The sensitivity is high, the action value is relatively accurate, and it can be adjusted; After installing the communication module, it can also be connected with the host computer for remote control; It is basically unaffected by ambient temperature. Other drawbacks are the high cost.

2) The disadvantage of the thermomagnetic tripper is that it can only provide two-stage protection; The error of the action value is relatively large, and it can be adjusted in a small amount; It is greatly affected by the environment. Its advantages are low cost, stable performance, relatively high reliability, not affected by voltage fluctuations, and long life.