Exactly why is Micro switch referred to as a Micro switch? As it switches uAmps? Not really. It’s more prevalent to switch a number of Amps. Due to its size? It is quite sketchy what exactly is considered big and what exactly is already small. Then why so? Most likely since the first manufacturer was the American business known as Micro switch. And as these items were very popular, the name Unionwell Switch became a generic trademark for all producers.

The company Micro switch was acquired by Honeywell in 1950. And Honeywell registered the trademark Micro switch. Other manufacturers used the title Snap-Action switch or Basic switch. Nevertheless the concern still remains why the founder of the organization, Mr. Schulte, chose to title his business Micro switch? Because they switched Micro-amps? Probably not because in 1937 the Micro-amps failed to even exist. Because of their miniature dimensions? Probably yes, during those times they may be regarded as small.

And precisely what is that Micro switch? It is an electrical switch (patented in 1932) that is actuated by very little actual physical force. Switching occurs at specific roles in the actuator (not like other switches). Relatively small movement in the actuator switch generates a fairly big movement on the electric contacts, which occurs at high speed (no matter the speed of actuation). Typical durability comes from 1 to 10 millions of periods. This sturdiness is really a natural results of the design.

Micro switches usually are not run by person; it is always some shifting part of the gear. Common programs are detection (e.g. crammed paper in photocopier, the presence of materials or product). Other application could be a restrict switch (for control over device tools) or doorway switch (e.g. refrigerator).

And which one can we enjoy the most? We like the Marquardt Micro switches. probably the most. Why? As it is that Marquardt which produces electronic secrets for Mercedes, Volkswagen along with other high quality vehicles and that Marquardt that produces switches for light blue Bosch electric resources. That is why.

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

Then we choose the best terminals and the correct type of actuator:


– Directly PCB pins

– Angled PCB pins

– Soldering eyelets

– Quick connect (Faston)

– Wires


– Pin plunger

– Straight handle

– Curler lever

– Simulated curler

– Spring handle

What is important when using Micro switches? To begin with, load size and type. Some types of weight have greater inrush present. E.g. relay has 5 times greater inrush present than nominal, motor 10 occasions, incandescent lamp 15 times and solenoid even 20 occasions. On the other hand, for switching little loads, do not use Unionwell Switch for top currents. We recommend utilizing Micro switch with gold coated connections.

For harsh atmosphere (dust and moisture), please use Micro switches with higher Ip address ranking (up to IP67). We recommend applying a contact defensive circuit to increase contact sturdiness, avoid sound, and reduce the generation of carbide or nitric acidity due to arc. The use of a contact defensive circuit might hold off the reaction duration of the stress. Examples of this kind of circuits:

-Radio controlled Circuit – in techniques with power source of 24-48V, it really is efficient to connect the Radio controlled circuit in parallel for the weight. When the power supply voltage is 100-200V, then in parallel to the contacts (in cases like this when AC is switched, the burden impedance has to be below the R and C impedance)

-Varistor – making use is much like RC circuit, despite those problems if in parallel to load or contacts. Varistor helps to ensure that no high-voltage is imposed around the connections.

-Diode – energy stored in the coil is changed into current through the diode connected in parallel to the weight. Then your current flowing to the coil is ingested and Joule warmth is produced from the resistance from the inductive weight. The diode must endure a maximum inverse voltage 10 times greater than the circuit voltage and a ahead current as high as or more than the stress present.

-Diode and Zener diode – this technique will likely be effective if the reset time hold off brought on by the diode method is very long. Zener voltage to get a Zener diode has to be about 1.2 times higher than the ability resource.

Be sure that the working body works efficiently. The design of it needs to be circular or oblique – to avoid shocks towards the actuator. And naturally, operate the actuator of the hinge curler handle or simulated hinge handle kind through the correct (proper) path.

Ensure that the stroke to the actuator is set not to surpass the total travel position. Otherwise, the working body may damage the actuator or even the switch itself, as well as the anxiety applied to the moving springtime in the switch will increase and after that, the oaglhk in the switch may be deteriorated.

Plus some more information – to not tighten the anchoring screws a lot of – never to deform our bodies of any switch. Or when soldering, adjust the volume of solder so that the flux will not enter the switch, it can cause contact malfunction.

Try out the Marquardt Unionwell Switch. Even a bad option can shift you ahead. But it expenses time and money. Maybe these recommendations can help you save cash and some time.

Unionwell Switch – Discover More..

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