Exactly why is Micro switch referred to as a Micro switch? Since it switches uAmps? Not really. It’s more common to switch a number of Amps. Because of its dimension? It is quite questionable precisely what is considered big and precisely what is currently little. Then why so? Probably since the first manufacturer was the American company known as Micro switch. And as these products were very popular, the name Unionwell Switch became a generic brand for all producers.

The company Micro switch was obtained by Honeywell in 1950. And Honeywell authorized the brand Micro switch. Other manufacturers utilized the title Click-Motion switch or Fundamental switch. However the concern still continues to be why the founder of the business, Mr. Schulte, decided to name his company Micro switch? Since they changed Micro-amps? Probably not since in 1937 the Micro-amps did not even really exist. Because of their small measurements? Probably indeed, during that time they could be considered small.

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

Micro switches usually are not run by individual; it will always be some moving part of the equipment. Typical programs are recognition (e.g. crammed paper in photocopier, the actual existence of material or product). Other application could be a restrict switch (for control over machine resources) or doorway switch (e.g. fridge).

And which one should we love the most? We love the Marquardt Micro switches. by far the most. Why? Because it is that Marquardt that creates digital secrets for Mercedes, Volkswagen along with other high quality vehicles which Marquardt that creates switches for light blue Bosch electrical resources. That is why.

Marquardt features a nice selection of Micro switches. Three fundamental dimensions – small (Series 1005 and 1080, width about 28mm), subminiature (Collection 1050, width about 20mm) and extremely subminiature (Series 1055, width 13mm).

Then we choose the right terminals and also the correct kind of actuator:


– Straight PCB pins

– Angled PCB pins

– Soldering eyelets

– Fast connect (Faston)

– Wires


– Pin plunger

– Straight handle

– Roller lever

– Simulated roller

– Spring lever

What is important when you use Micro switches? To begin with, weight size and type. Some kinds of load have higher inrush present. E.g. communicate has 5 occasions higher inrush current than nominal, motor 10 occasions, incandescent lamp 15 occasions and solenoid even 20 times. However, for changing little lots, tend not to use Unionwell Switch for top currents. We recommend using Micro switch with gold plated connections.

For severe environment (dirt and moisture), make sure you use Micro switches with greater IP rating (up to IP67). We recommend using a contact defensive circuit to prolong contact sturdiness, prevent sound, and reduce the era of carbide or nitric acidity because of arc. The use of a contact protective circuit may hold off the response time of the burden. Types of this kind of circuits:

-Radio controlled Circuit – in systems with power supply of 24-48V, it really is efficient for connecting the RC circuit in parallel towards the weight. Once the power source voltage is 100-200V, then in parallel towards the contacts (in this instance when Air conditioning is changed, the stress impedance should be lower than the R and C impedance)

-Varistor – making use is very similar to Radio controlled circuit, despite these conditions while in parallel to weight or contacts. Varistor ensures that no high-voltage is enforced on the contacts.

-Diode – energy kept in the coil is changed into present through the diode linked in parallel towards the load. Then your current moving for the coil is consumed and Joule heat is produced from the level of resistance from the inductive weight. The diode must withstand a maximum inverse voltage 10 occasions greater than the circuit voltage along with a ahead present up to or more than the stress current.

-Diode and Zener diode – this method will be effective in the event the reset time delay caused by the diode technique is too much time. Zener voltage for any Zener diode should be about 1.2 times greater than the ability source.

Ensure that the operating entire body works smoothly. The shape of it ought to be circular or oblique – to stop shocks to the actuator. And of course, run the actuator of any hinge curler handle or simulated hinge handle kind through the correct (correct) direction.

Be sure that the stroke for the actuator is placed never to exceed the entire travel position. If not, the working entire body may harm the actuator or the switch itself, and also the anxiety put on the shifting springtime in the switch will increase then, the oaglhk in the switch could be worsened.

Plus some additional information – to not tighten the screws excessive – to not deform the body of any switch. Or when soldering, adjust the quantity of solder so that the flux fails to go into the switch, there may be contact failure.

Try out the Marquardt Unionwell Switch. A bad option can move you forward. Nevertheless it expenses money and time. Perhaps these recommendations will allow you to reduce your cost and some time.

Unionwell Switch – Intriguing Points..

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