How to choose a button for your equipment

Buttons, toggle switches, switches, circuit breakers, triggers, all types of switching, differ primarily in design (overall dimensions, key size) and functionality (lock, pressure safety device, reverse or speed control, additional soft start circuit, switching modes, etc.)

Here are some international standards:

Buttons SPST, SPDT, DPST, DPDT, SP3T, DP3T

SPDT - Single Pole, Double Throw. One pole, two directions. There is one common contact (pole), which can be connected to one of the other two contacts. In Russian circuitry, this is called one contact group. 

DPDT - Double Pole, Double Throw. Two poles, two directions. Two contacts (poles), each of which can be connected to one contact or the other. In Russian, these are called two groups of contacts. Each group is not electrically connected to each other. Each of them can switch completely different circuits. They have only one thing in common: they operate simultaneously.

There are switches that have many more sets of contacts than just two. For example, relays, which are themselves electrical switches, with four sets of contacts are quite common.

SPST - Single Pole, Single Throw. One pole, one direction. One contact can be connected to one other contact or disconnected from one other contact. This is also one group of contacts, but not complete.

DPST - Double Pole, Single Throw. Two poles, one direction. Each of the two contacts can be connected to one other contact or disconnected from one other contact. This is considered two groups of contacts. There may be more than two such groups.
First of all, look at the design of the device itself and the method of its electrical connection. Marking is considered as additional information, no need to focus on it. If you have difficulty, show us your button on the messenger from the contacts
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