In many cases, a microswitch is a spring-loaded version with a lever. A spring mechanism ensures that the switch returns to its initial position after an operation.
In most cases, a microswitch has three connection points: C (Common), N/O (Normally Open) and N/C (Normally Closed). Depending on the switching function, these points are switched differently. With a toggle switch, one of the two connection points, also called terminals, N/O or N/C, is always supplied with power. Microswitches also have N/C and N/O contacts. A normally closed contact is the term used for a closed contact in the idle state: it is opened, for example, when actuated. Here the C terminal is connected to the N/C terminal in idle state and this connection is interrupted when switching. With a normally open contact, on the other hand, the contact is only closed during the switching process. In this case, C and N/O terminals are connected when actuated.
Depending on the variant, microswitches have different connection terminals. They can either be plugged directly onto a breadboard, soldered onto a circuit board or attached using a screw mechanism. Robust materials are used as materials that reliably withstand mechanical and thermal influences. These include thermosets, fiberglass and rubber. All in all, microswitches have a particularly long service life with several million switching cycles.
Further construction methods of microswitches are so-called snap-action switches or detector switches.
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