Single pole single throw foot switch: There is one normally closed contact and one normally open contact. When the foot switch is pressed down, the normally open contact is closed, and the normally closed contact is disconnected; After release, the normally open contact is re-opened, and the normally closed contact is re-closed, which can be used for simple circuit on-off control, such as controlling the switching off of a lamp.

Single-pole double-throw foot switch: has two normally open contacts and one normally closed contact. When stepping down, one of the two normally open contacts is closed and the other is disconnected; After release, the two normally open contacts are re-disconnected, and the normally closed contacts remain in their original state, which can achieve more diverse circuit switching functions.

Double pole single throw foot switch: has two normally closed contacts and two normally open contacts. When the foot switch is pressed down, one of the normally open contacts is closed, and the two normally closed contacts are disconnected; After release, the normally open contact is re-opened, and the two normally closed contacts are re-closed, which can control the on-off of two independent circuits at the same time.

Double pole double throw foot switch: four normally open contacts and two normally closed contacts. When stepping down, one pair of normally open contacts is closed, and the other pair of normally open contacts is disconnected; After loosening, the two pairs of normally open contacts are re-disconnected, and the normally closed contacts remain intact, which is suitable for more complex circuit switching requirements.

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