Automatic air switch, also known as automatic air circuit breaker, is a very important electrical appliance in low-voltage power distribution network and electric drive system. It integrates control and multiple protection functions. In addition to being able to complete contact and break the circuit, it can also short-circuit the circuit or electrical equipment. Severe overload and under-voltage protection can also be used to start the motor infrequently.
The automatic air switch is safe to operate. Easy to use. Reliable. easy installation. After the action (such as short circuit troubleshooting), there is no need to replace components (such as the melt). Therefore, in industry. It has been widely used in residential areas.
The automatic air switch is mainly used to frequently switch on and off the circuit and control the operation of the motor under normal operating conditions of the circuit, and can automatically break the circuit when the circuit is overloaded, short-circuited, and lost voltage. It has the advantages of safe operation, high breaking capacity, multiple protection functions, and adjustable actions. Once a short-circuit fault occurs, it is generally not necessary to replace parts when troubleshooting, so it is widely used.
When the switch is connected to the power, the electromagnetic release. If there is no abnormal response in the thermal release and undervoltage release, the switch operates normally. When a short circuit or severe overload current occurs on the line, the short circuit current exceeds the instantaneous trip setting current value, the electromagnetic release 6 generates a sufficiently large suction force, attracts the armature 8 and collides with the lever 7, and causes the hook 4 to rotate upward about the rotation shaft seat 5 Disengaged from the buckle 3, the buckle cuts off the three main contacts under the action of the reaction force spring 16, and cuts off the power supply.
When the circuit is generally overloaded, although the overload current cannot make the electromagnetic trip, but it can make the heat element 13 generate a certain amount of heat, promote the bimetal sheet 12 to bend upward when heated, and push the lever 7 to disengage the hook from the lock. Disconnect the main contact and cut off the power.