Button switch use precautions

Electrical matters

About using load

The ability to switch between the AC and DC circuits varies greatly. Please confirm the rating.

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 it is difficult to eliminate the arc once it is generated, and the arc time is long. Moreover, the current direction does not change, so there is a phenomenon of contact migration, and the contact may not be broken due to unevenness, which may cause malfunction.

The constant current and surge current of some types of loads vary widely. Please use within the range of allowable inrush current values. The greater the inrush current during closed circuit, the greater the consumption and migration of the contacts, and the failure of the contacts to switch due to the fusion and migration of the contacts.

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

Therefore, check the rated conditions and indicate the control capacity in the rated value. However, these are not enough. In the special load circuit such as the voltage, current waveform, and load type at the time of switching on and off, the actual load circuit must be separately implemented. Equipment test confirmed. • For small voltages and currents, use a product with a small load. When using general-purpose silver contacts, contact reliability may be degraded.

When the push button switch is out of the small and high load type of the button switch range, connect a relay suitable for the load.

The conditions for determining the rating of each model are as follows.

Inductive load: power factor 0.4 or higher (AC), time constant 7ms or less (DC)

Lamp load: A load with a surge current equivalent to 10 times the constant current. Motor load: A load with a surge current equivalent to 6 times the constant current.

Note. Inductive loads are particularly important in DC circuits, so the value of the time constant (L/R) of the load must be fully understood.

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