Exactly why is Micro switch referred to as a Micro switch? Because it switches uAmps? Not really. It is more common to switch a number of Amps. Due to the size? It is very sketchy precisely what is regarded as large and what exactly is already little. Then why so? Probably as the first manufacturer was the American business called Micro switch. And as the products were very popular, the name Unionwell Switch became a common trademark for all producers.

The organization Micro switch was obtained by Honeywell in 1950. And Honeywell authorized the brand Micro switch. Other producers used the title Click-Action switch or Fundamental switch. However the concern still remains why the founding father of the company, Mr. Schulte, chose to title his business Micro switch? Because they switched Micro-amps? Perhaps not since in 1937 the Micro-amps did not even really exist. Because of their miniature measurements? Most likely yes, at that time they may be considered small.

And precisely what is that Micro switch? It is really an electric switch (trademarked in 1932) which is actuated by hardly any physical pressure. Switching occurs at particular positions of the actuator (unlike other switches). Relatively little motion in the actuator switch generates a fairly large motion in the electrical connections, which happens at high speed (whatever the velocity of actuation). Typical sturdiness comes from 1 to 10 countless periods. This durability is a natural consequence of the design.

Micro switches usually are not run by person; it will always be some shifting portion of the gear. Typical applications are detection (e.g. crammed paper in photocopier, the presence of materials or product). Other application can be a restrict switch (for control over device tools) or doorway switch (e.g. fridge).

And which one do we love the most? We love to the Marquardt Micro switches. probably the most. Why? As it is that Marquardt that produces digital secrets for Mercedes, Volkswagen and other high quality vehicles and that Marquardt that produces switches for light blue Bosch electric tools. That is why.

Marquardt features a nice range of Micro switches. 3 basic sizes – small (Collection 1005 and 1080, size about 28mm), subminiature (Series 1050, width about 20mm) and extremely subminiature (Collection 1055, size 13mm).

Then we select the right terminals as well as the correct kind of actuator:


– Directly PCB pins

– Angled PCB pins

– Soldering eyelets

– Fast connect (Faston)

– Cables


– Pin plunger

– Straight handle

– Roller handle

– Simulated curler

– Spring handle

What is important when you use Micro switches? First of all, load size and type. Some kinds of weight have much higher inrush present. E.g. relay has 5 occasions greater inrush present than nominal, motor 10 occasions, incandescent light 15 occasions and solenoid even 20 times. On the other hand, for switching small lots, usually do not use Unionwell Switch for top currents. We suggest utilizing Micro switch with gold plated contacts.

For harsh atmosphere (dust and dampness), please use Micro switches with greater IP rating (as much as IP67). We recommend using a contact protective circuit to prolong contact durability, prevent noise, and suppress the era of carbide or nitric acid due to arc. The use of a contact protective circuit may delay the response duration of the load. Types of this kind of circuits:

-RC Circuit – in techniques with power source of 24-48V, it is effective for connecting the RC circuit in parallel for the weight. If the power supply voltage is 100-200V, then in parallel for the connections (in cases like this when AC is changed, the stress impedance should be less than the R and C impedance)

-Varistor – the utilization is much like RC circuit, despite having those problems if in parallel to load or connections. Varistor helps to ensure that no higher-voltage is imposed on the connections.

-Diode – energy kept in the coil is altered into present through the diode connected in parallel to the load. Then this present flowing towards the coil is consumed and Joule warmth is generated from the resistance from the inductive load. The diode should endure a peak inverse voltage 10 occasions more than the circuit voltage along with a forward present as high as or more than the load present.

-Diode and Zener diode – this technique is going to be effective when the reset time delay due to the diode technique is very long. Zener voltage for any Zener diode should be about 1.2 occasions more than the energy resource.

Be sure that the operating entire body works efficiently. The design of it should be circular or oblique – to prevent shocks to the actuator. And of course, run the actuator of a hinge roller lever or simulated hinge lever kind from the correct (correct) direction.

Ensure that the cerebrovascular event to the actuator is defined not to surpass the entire travel position. Otherwise, the operating entire body might harm the actuator or the switch itself, as well as the anxiety applied to the shifting springtime inside the switch will increase then, the oaglhk from the switch might be deteriorated.

Plus some additional information – never to tighten up the anchoring screws a lot of – to not deform the body of the switch. Or when soldering, modify the quantity of solder so that the flux fails to enter the switch, it can cause contact malfunction.

Try out the Marquardt Unionwell Switch. Also a bad choice can move you ahead. But it expenses money and time. Maybe these recommendations will help you save cash plus some time.

Unionwell Switch – Amazing Value..

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