Why is Micro switch referred to as a Micro switch? As it switches uAmps? Not really. It is more prevalent to switch a number of Amps. Due to its size? It is quite questionable what exactly is considered large and what is already little. Then why so? Most likely since the first producer was the American business known as Micro switch. And as these products were very popular, the name Unionwell Switch became a common brand for all suppliers.

The company Micro switch was obtained by Honeywell in 1950. And Honeywell authorized the trademark Micro switch. Other manufacturers used the title Snap-Action switch or Basic switch. Nevertheless the concern still remains why the founding father of the organization, Mr. Schulte, made a decision to title his business Micro switch? Since they switched Micro-amps? Most likely not since in 1937 the Micro-amps failed to even exist. Because of their small dimensions? Most likely indeed, at that time they might be regarded as tiny.

And what exactly is that Micro switch? It is really an electric switch (trademarked in 1932) that is certainly actuated by very little actual physical pressure. Switching happens at particular roles in the actuator (nothing like other switches). Fairly little motion on the actuator button generates a fairly large movement in the electric connections, which occurs at high-speed (no matter the velocity of actuation). Common sturdiness comes from 1 to 10 millions of periods. This durability is a natural results of the design.

Micro switches usually are not operated by individual; it is always some moving area of the gear. Typical applications are recognition (e.g. jammed paper in photocopier, the presence of material or product). Other application can be a restrict switch (for control of device resources) or doorway switch (e.g. refrigerator).

And which one can we enjoy probably the most? We like the Marquardt Micro switches. probably the most. Why? Because it is that Marquardt that creates electronic secrets for Mercedes, Volkswagen and other premium cars and that Marquardt which produces switches for blue Bosch electrical tools. That’s why.

Marquardt includes a nice range of Micro switches. Three fundamental sizes – miniature (Collection 1005 and 1080, size about 28mm), subminiature (Series 1050, size about 20mm) and ultra subminiature (Collection 1055, width 13mm).

Then we choose the best terminals as well as the correct form of actuator:


– Directly PCB pins

– Angled PCB pins

– Soldering eyelets

– Fast link (Faston)

– Cables


– Pin plunger

– Straight handle

– Roller handle

– Simulated curler

– Spring lever

What is important when using Micro switches? To start with, load size and type. Some kinds of load have much higher inrush current. E.g. relay has 5 occasions greater inrush current than nominal, motor 10 occasions, incandescent light 15 times and solenoid even 20 occasions. However, for switching little loads, do not use Unionwell Switch for top currents. We suggest using Micro switch with gold coated connections.

For severe environment (dirt and dampness), make sure you use Micro switches with higher Ip address rating (approximately IP67). We recommend using a contact defensive circuit to prolong contact durability, avoid sound, and suppress the generation of carbide or nitric acidity as a result of arc. The use of a contact protective circuit may hold off the response time of the burden. Examples of this kind of circuits:

-RC Circuit – in systems with power supply of 24-48V, it really is effective to connect the Radio controlled circuit in parallel to the load. When the power source voltage is 100-200V, then in parallel to the connections (in this instance when Air conditioning is switched, the load impedance has to be less than the R and C impedance)

-Varistor – the utilization is much like RC circuit, despite having these conditions when in parallel to load or connections. Varistor helps to ensure that no high-voltage is imposed on the connections.

-Diode – power saved in the coil is altered into present by the diode linked in parallel towards the load. Then your present moving to the coil is ingested and Joule heat is generated from the level of resistance of the inductive weight. The diode should endure a maximum inverse voltage 10 times higher than the circuit voltage as well as a ahead present as high as or higher than the load present.

-Diode and Zener diode – this technique will likely be efficient if the reset time delay caused by the diode strategy is too much time. Zener voltage to get a Zener diode has to be about 1.2 times higher than the ability source.

Be sure that the operating body will continue to work efficiently. The form of it ought to be circular or oblique – to prevent shocks towards the actuator. And of course, operate the actuator of a hinge roller lever or simulated hinge lever type from the right (proper) direction.

Ensure that the stroke to the actuator is placed not to exceed the total travel position. Otherwise, the working entire body might harm the actuator or even the switch itself, as well as the anxiety put on the shifting spring inside the switch will increase and after that, the oaglhk in the switch might be worsened.

And a few more information – never to tighten up the screws too much – never to deform your body of any switch. Or when soldering, modify the quantity of solder in order that the flux does not enter in the switch, it may cause contact malfunction.

Try the Marquardt Unionwell Switch. Even a terrible option can shift you forward. Nevertheless it expenses time and money. Maybe these suggestions can help you save cash plus some time.

Unionwell Switch – Consider This..

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