Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Photocoupler

The air switch is also the circuit breaker, which is connected, disconnected and carries the rated working current in the circuit, and can be reliably protected in the event of overload, short circuit and under voltage of the line and the motor. The dynamic and static contacts and the contact rods of the circuit breaker are designed in parallel, and the dynamic repulsive force generated by the short circuit is used to disconnect the moving and static contacts, and the breaking ability is high, and the current limiting characteristic is strong.
When short circuited, the aromatic insulator around the static contact vaporizes, and the arc extinguishing action is performed, and the arcing distance is zero. The arc-extinguishing chamber of the circuit breaker adopts a metal grid structure, and the contact system has a repulsive current limiting mechanism. Therefore, the circuit breaker has a high breaking capacity and a current limiting capability.
With a double release. The inverse time action is that the bimetal is bent by heat to actuate the trip unit, and the instantaneous action is that the iron core street mechanism drives the trip unit. There are three types of tripping methods: thermal, electromagnetic and double tripping.
Automatic air switches, also known as low voltage circuit breakers, can be used to switch the load circuit on and off, as well as to control motors that are not frequently started. Its function is equivalent to the sum of all or all of the functions of the knife switch, over current relay, voltage loss relay, thermal relay and leakage protector. It is an important protection device in the low voltage distribution network.
The automatic air switch has many advantages such as protection function (overload, short circuit, under voltage protection, etc.), adjustable action value, high breaking capacity, convenient operation and safety, so it is widely used.
When short circuited, the aromatic insulator around the static contact vaporizes, and the arc extinguishing action is performed, and the arcing distance is zero. The arc-extinguishing chamber of the circuit breaker adopts a metal grid structure, and the contact system has a repulsive current limiting mechanism. Therefore, the circuit breaker has a high breaking capacity and a current limiting capability. With a double release. The inverse time action is that the bimetal is bent by heat to actuate the trip unit, and the instantaneous action is that the iron core street mechanism drives the trip unit. There are three types of tripping methods: thermal, electromagnetic and double tripping.
When the line is short-circuited or severely overloaded, the short-circuit current exceeds the instantaneous trip setting current value, and the electromagnetic tripper generates a sufficient suction force to attract the armature to the impact lever, causing the hook to rotate upwardly around the rotating shaft seat and disengage the lock. The lock buckles the three main contacts under the action of the reaction force spring to cut off the power.
When the line is generally overloaded, the overload current can not make the electromagnetic release action, but can cause the heat element to generate a certain amount of heat, causing the bimetal to be bent upwards by heating, pushing the lever to disengage the hook from the lock, and the main touch The head is disconnected, and the main contact of the power supply is cut off by the operating mechanism (manual or electric), and the contact system can not only turn on or off the normal operating current due to the installation of the arc extinguishing device, but also quickly in the event of a fault. The fault current that is several times larger than the normal operating current is cut off, so that the tripping mechanism of the electrical equipment switch in the circuit can be effectively protected by a set of connecting rod devices. When the main contact is closed by the operating mechanism, it is locked by the lock hook in the closed position. If a fault occurs in the circuit, the relevant trip unit will act to disengage the lock hook in the trip mechanism, so that the main contact is quickly broken by the release spring. According to the different protection effects, the trip unit can be divided into an overcurrent release and a voltage loss release.
Under normal conditions, the armature of the overcurrent release is released; in the event of a severe overload or short circuit fault, the coil in series with the main circuit will generate a strong electromagnetic attraction to attract the street iron and open the hook. , the main contact is disconnected. The operation of the undervoltage release is exactly the opposite. When the voltage is normal, the electromagnetic attraction attracts the armature and the main contact is closed. Once the voltage is severely dropped or powered down, the armature is released and the main contact is opened. When the power supply voltage returns to normal, it must be re-closed before it can work, achieving voltage loss protection.
The air switch is a switch that trips when the switch forms a loop as long as there is a short circuit.
There are three types of tripping methods: thermal, electromagnetic and double tripping.
When the line is generally overloaded, the overload current can not make the electromagnetic release action, but can cause the heat element to generate a certain amount of heat, causing the bimetal to be bent upwards by heating, pushing the lever to disengage the hook from the lock, and the main touch The head is broken and the power is turned off.
When the line is short-circuited or severely overloaded, the short-circuit current exceeds the instantaneous trip setting current value, and the electromagnetic tripper generates a sufficient suction force to attract the armature to the impact lever, causing the hook to rotate upwardly around the rotating shaft seat and disengage the lock. The lock buckles the three main contacts under the action of the reaction force spring to cut off the power.
The trip mechanism of the switch is a set of linkage devices. When the main contact is closed by the operating mechanism, it is locked by the lock hook in the closed position. If a fault occurs in the circuit, the relevant trip unit will act to disengage the lock hook in the trip mechanism, so that the main contact is quickly broken by the release spring. According to the different protection effects, the trip unit can be divided into an overcurrent release and a voltage loss release.
Under normal conditions, the armature of the overcurrent release is released; in the event of a severe overload or short circuit fault, the coil in series with the main circuit will generate a strong electromagnetic attraction to attract the street iron and open the hook. , the main contact is disconnected. The operation of the undervoltage release is exactly the opposite. When the voltage is normal, the electromagnetic attraction attracts the armature and the main contact is closed. Once the voltage is severely dropped or powered down, the armature is released and the main contact is opened. When the power supply voltage returns to normal, it must be re-closed before it can work, achieving voltage loss protection.
Because there are many insulation methods, there are oil switches, vacuum switches and other inert gas (sulfur hexafluoride gas) switches. Air is used to extinguish the arc generated during the switching process. So called the air switch.
The air switch is a switch that uses air to extinguish the arc, so it is called an air switch.