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Self-locking Metal Switch And Touch Switch Difference
Jan 01, 2018

Self-locking metal switch generally refers to the switch comes with mechanical locking function, press down, after the button is not completely jump up, in a locked state, you need to press it again to unlock completely jump. It is called self-locking switch. The early direct complete power off the TV, the monitor is to use this switch.

The difference between a self-locking switch with light and an ordinary self-locking metal switch lies in the fact that the illuminated switch makes full use of the space in its key and holds a small light bulb or LED with one end connected to the neutral wire and the other end The step-down resistor is connected in parallel with the normally open contact of the switch. When the switch is closed, the equipment operates and provides power to the indicator light. The type of diagonal switch at the same time, the parallel switch at the same time, by leaps and bounds simultaneously switch.

In fact with self-locking metal switch and touch switch is to describe the switch performance from different aspects; "self-locking" refers to the switch through the locking mechanism to maintain a state (on or off), "touch" is the use of the operating switch The power of the size.

metal switch.jpg

Mechanical switches in general may be able to distinguish between:

Switch from the mode of operation sub-knob, plate moving (including New Zealand switch, boat switch), button-type; which knob and plate-type switch can be maintained (locked) in the operation of the on or off state , Such as the daily use of the light switch, fan speed switch, most of these switches do not have to emphasize whether the self-locking, because there are obvious "direction of operation"; only the push button switch, use are pressed, most of the button switch Are used to press the circuit is turned on or off, release the state that is restored, it is sometimes referred to as "bell switch", push-button switch in order to maintain the "has been pressed" state, just as ordinary switches There are self-locking device, the use of self-locking performance, so that it can also be kept on or off, which is with a self-locking switch, which, for some needs, the number of switches in the work allows only one is connected State, the rest must be disconnected, there will be a number of button switch side by side combination, and the use of "interlocking mechanism" to allow only one switch is connected to the lock state, when you press the other switch, the switch is locked But the original lock switch is released (e.g., "play, fast forward, rewind" button on mechanical tape recorder). These switches and contacts can be one or more sets. There are many kinds of locking mechanisms. One of the more widely used is to slide along a heart-shaped groove by a spring hook, and the two sharp points of the heart-shaped groove correspond to the locking and releasing positions of the switch.

As the name implies, "touch" means that the contact state of the switch can be changed without much power contact, so the contact capacity is small and the structure is simple. Only after the switch power is withdrawn can only be maintained. That is to say, At present, the membrane switch and the small micro switch can be regarded as the touch switch. Most of the structures are printed with conductive lines on two mutually insulated films, and by pressing So that the lines connected to each other; or the use of thin flexible metal butterfly bowls, press the shrapnel to connect the printed circuit.

Electric cooker, electric kettle on the switch, after the press is locked, but heated to the specified conditions, the lock switch state of the magnet or bimetal action, the switch reset at the same time cut off the power (rice cooker is converted to the state of insulation) , May not meet the "reset after power off" requirement.

Reset after power failure, that is, the locking mechanism should work on the power supply, the finished product does not seem to, because the requirements can be used general button switch and the relay circuit can be achieved; but if only one relay (or contactor) Group normally open contacts used to control the relay (contactor) work coil power supply, the relay balance iron as a switch button, press the balance iron, the relay control coil contacts closed, the coil is energized, the relay remains snagged Self-locking), the rest of the contact control other lines; when the power is off, the relay then power, balance iron reset, the corresponding button reset, you need to press the relay balance iron again, the power can be switched on again. This relay is quite a button switch with live lock.

As for the infrared switch, IC card switch, etc., with other components of the switch, is no longer the scope of the mechanical switch can not be regarded as mechanical switch.

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