Understanding Pushbutton Switch Considerations

For the push button switch, reasonable use is very important, so what should be paid attention to when using the push button switch?

There is a big difference between the push button switch capacity in AC and DC circuits, and the rated value needs to be confirmed.

In the case of DC, the control capacity is very low. This is mainly because DC does not have a zero point (current zero crossing point) like AC, so once an arc is generated, it is difficult to eliminate, and the arc time is very long. Moreover, the direction of the current does not change, so there will be a phenomenon of contact migration, and the contact will not be disconnected due to unevenness, which may cause malfunction.

Some types of loads have a large difference between constant current and inrush current. It needs to be used within the allowable surge current value range. The greater the surge current in the closed circuit, the greater the consumption and migration of the contacts, and the failure of the contacts to switch will be caused by the welding and migration of the contacts.

In the case of inductive induction, a reverse induced voltage will be generated. The higher the voltage, the greater the energy, and the consumption and migration of the contacts will also increase.

Therefore, it is necessary to confirm the rated conditions, and the control capacity is marked in the rated value, but these alone are not enough. In the special load circuit such as the voltage, current waveform, and load type at the time of turning on and off, it must be carried out separately. Confirmation by actual device testing. Micro load products are required for micro voltage and current applications. When using general-purpose silver contacts, contact reliability may be reduced. If the pushbutton switch exceeds the range of the pushbutton switch, please connect a relay suitable for the load.