TEST DRAFT — How to Choose the Right Micro Switch for Your Application

What Is a Micro Switch?

A micro switch (snap-action switch) is a switch whose
contacts snap between states at a precise actuator position, independent of how
fast the actuator is moved. That snap action is what gives it a long mechanical
life and a crisp tactile feel — and it is why specifying one is mostly about
force, travel and contact rating.

Key Specifications

How to Choose

Start from the load, not the actuator. Size the contact rating above the
inrush current, then pick the actuator style for the mechanical envelope, then
confirm the operating force suits how the end user will press it.

• Pin plunger — precise position sensing, short travel.
• Hinge lever — low operating force, tolerant of misalignment.
• Roller lever — sliding or cam-driven actuation, low wear.
• Simulated roller — slow-break applications where a true
  roller would chatter.

Applications

Common fits include rice cooker lids, sealing machines, camera module reset
detection, automotive door latches, power tool triggers and vending mechanisms.
In each case the switch is doing one of two jobs — detecting a position, or
interrupting power for safety.

Frequently Asked Questions

What is the difference between a micro switch and a limit switch?

A limit switch is a ruggedised, usually larger assembly built around a
snap-action micro switch, with a housing rated for industrial environments. The
micro switch is the sensing element inside it.

Can a micro switch switch DC and AC at the same rating?

Usually not. DC arcs do not self-extinguish at a zero crossing the way AC
arcs do, so DC ratings are typically well below the AC rating on the same part.
Always check both lines of the datasheet.

How does IP rating affect switch selection?

An unsealed switch is fine inside a sealed enclosure. Where the switch itself
is exposed to dust or washdown, specify a sealed part — IP67 is the common
target — and confirm the rating covers the actuator, not just the body.