create new tag
view all tags

Find Right Type Of Micro Switches

Probably as a result of the primary producer was the American company called Micro Switch. And as these merchandise were very fashionable, the name micro switch grew to become a generic trademark for all producers. China manufacturing firm Unionwell experienced more than 20 years And used the name Snap-Action Switch or Basic Switch.

What precisely is that micro switch?

It is an electric switch (patented in 1932) that is actuated by very little bodily force. Switching occurs at specific positions of the actuator (not like different switches). Relatively small movement at the actuator button produces a comparatively massive movement at the electrical contacts, which happens at excessive velocity (whatever the speed of actuation). Typical durability is from 1 to 10 tens of millions of cycles. This durability is a natural consequence of the design.

Micro switches aren't operated by person; it's always some moving part of the gear. Common applications are detection (e.g. jammed paper in photocopier, the presence of material or product). Other functions is usually a limit switch (for control of machine tools) or door switch (e.g. fridge).

Then we select the proper terminals and the right type of actuator:


- Straight PCB pins

- Angled PCB pins

- Soldering eyelets

- Quick connect (Faston)

- Cables


- Pin plunger

- Straight lever

- Roller lever

- Simulated curler

- Spring lever

What is necessary when utilizing micro switches?

First of all, load measurement and type. Some types of load have much larger inrush current. E.g. relay has 5 instances higher inrush current than nominal, motor 10 instances, incandescent lamp 15 times and solenoid even 20 times. On the opposite hand, for switching small masses, don't use a micro switch for high currents. We suggest utilizing a micro switch with gold plated contacts.

For harsh environments (dust and moisture), please use micro switches with higher IP rating (up to IP67).

We advocate applying a contact protecting circuit to extend contact sturdiness, stop noise, and suppress the generation of carbide or nitric acid because of arc. The use of a contact protective circuit might delay the response time of the load. Examples of such circuits:

-RC Circuit - in techniques with energy supply of 24-48V, it is efficient to connect the RC circuit in parallel to the load. When the power provide voltage is one hundred-200V, then in parallel to the contacts (in this case when AC is switched, the load impedance should be decrease than the R and C impedance)

-Varistor - the use is very similar to RC circuit, even with these circumstances when in parallel to load or contacts. Varistor ensures that no excessive-voltage is imposed on the contacts.

-Diode - vitality saved in the coil is modified into current by the diode linked in parallel to the load. Then the present flowing to the coil is consumed and Joule warmth is generated by the resistance of the inductive load. The diode should face up to a peak inverse voltage 10 times higher than the circuit voltage and a ahead current as high as or larger than the load present.

-Diode and Zener diode - this technique might be effective if the reset time delay attributable to the diode technique is too lengthy. Zener voltage for a Zener diode have to be about 1.2 occasions higher than the power supply.

Ensure that the working body will work smoothly. The form of it ought to be spherical or oblique - to stop shocks to the actuator. And in fact, operate the actuator of a hinge curler lever or simulated hinge lever kind from the proper (appropriate) course.

Ensure that the stroke to the actuator is about not to exceed the entire journey place. If not, the working physique could injury the actuator or the switch itself, and the stress applied to the transferring spring inside the switch will increase and then, the durability of the switch could also be deteriorated.

And some more particulars - to not tighten the screws too much - not to deform the body of a switch. Or when soldering, adjust the amount of solder so that the flux doesn't enter the switch, it could possibly cause contact failure.

Try the Unionwell micro switches. Even a foul selection can move you ahead. But it costs money and time. Maybe these recommendations will help you save some cash and some time.Check out our supply of Unionwell micro switches, we now have added new varieties with various kinds of actuators.

If you want extra details about the micro switches, or if you are thinking about other unionwell merchandise, please do not hesitate to contact us at https://www.unionwellgermany.com .

-- Dakshini Das - 2021-02-06


Topic revision: r1 - 2021-02-06 - DakshiniDas
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback