Why is Micro switch called a Micro switch? Because it switches uAmps? Not really. It’s more widespread to switch a number of Amps. Because of its dimension? It is very sketchy what is regarded as large and precisely what is currently little. Then why so? Most likely since the first manufacturer was the American business called Micro switch. And as these products were extremely popular, the name Unionwell Switch became a common trademark for all suppliers.

The company Micro switch was acquired by Honeywell in 1950. And Honeywell authorized the brand Micro switch. Other manufacturers used the title Snap-Action switch or Fundamental switch. Nevertheless the concern still continues to be why the founding father of the company, Mr. Schulte, made a decision to name his company Micro switch? Because they switched Micro-amps? Perhaps not because in 1937 the Micro-amps failed to even really exist. Because of the miniature dimensions? Most likely indeed, during that time they might be regarded as small.

And what exactly is that Micro switch? It is an electric switch (patented in 1932) that is actuated by hardly any actual physical force. Switching occurs at particular roles of the actuator (nothing like other switches). Fairly small motion on the actuator switch creates a fairly big movement at the electric connections, which happens at high-speed (whatever the velocity of actuation). Common sturdiness comes from 1 to 10 countless cycles. This sturdiness is a all-natural results of the design.

Micro switches usually are not run by individual; it is always some shifting area of the equipment. Typical applications are detection (e.g. crammed paper in photocopier, the actual existence of materials or product). Other application can be quite a restrict switch (for control of device resources) or doorway switch (e.g. fridge).

And which one do we love the most? We love the Marquardt Micro switches. probably the most. Why? Because it is that Marquardt that creates electronic keys for Mercedes, Volkswagen as well as other high quality vehicles which Marquardt which produces switches for blue Bosch electric resources. That’s why.

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

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


– Directly PCB pins

– Angled PCB pins

– Soldering eyelets

– Quick connect (Faston)

– Wires


– Pin plunger

– Directly lever

– Roller handle

– Simulated curler

– Spring handle

The most important thing when you use Micro switches? To begin with, weight dimension and type. Some kinds of weight have much higher inrush present. E.g. communicate has 5 occasions greater inrush present than nominal, motor 10 times, incandescent light 15 times and solenoid even 20 times. On the other hand, for changing little lots, tend not to use Unionwell Switch for top currents. We suggest using Micro switch with gold plated contacts.

For harsh atmosphere (dust and moisture), please use Micro switches with higher IP ranking (approximately IP67). We suggest using a contact defensive circuit to extend contact sturdiness, avoid sound, and reduce the era of carbide or nitric acid due to arc. The use of a contact defensive circuit might hold off the response period of the burden. Samples of this kind of circuits:

-RC Circuit – in systems with power supply of 24-48V, it is efficient to connect the RC circuit in parallel towards the load. If the power source voltage is 100-200V, then in parallel to the connections (in this instance when AC is switched, the load impedance must be below the R and C impedance)

-Varistor – the use is much like Radio controlled circuit, despite having those problems when in parallel to load or contacts. Varistor helps to ensure that no higher-voltage is enforced on the contacts.

-Diode – power stored in the coil is altered into current from the diode connected in parallel towards the load. Then this present moving towards the coil is ingested and Joule heat is produced by the level of resistance in the inductive weight. The diode should withstand a maximum inverse voltage 10 occasions more than the circuit voltage and a ahead current as much as or more than the burden current.

-Diode and Zener diode – this technique will likely be efficient if the reset time delay caused by the diode technique is too much time. Zener voltage for a Zener diode must be about 1.2 times more than the power resource.

Ensure that the operating body works efficiently. The design of it needs to be circular or oblique – to prevent shocks towards the actuator. And naturally, operate the actuator of any hinge curler handle or simulated hinge lever kind through the right (proper) path.

Ensure that the stroke towards the actuator is set not to surpass the entire travel place. Otherwise, the operating body might harm the actuator or even the switch alone, and the stress applied to the moving springtime in the switch will increase and after that, the oaglhk in the switch may be worsened.

Plus some more details – not to tighten the anchoring screws excessive – not to deform your body of the switch. Or when soldering, modify the volume of solder so that the flux will not go into the switch, it may cause contact malfunction.

Try the Marquardt Unionwell Switch. Even a bad option can move you ahead. But it costs time and money. Maybe these recommendations will help you save cash and a few time.

Unionwell Switch – Why So Much Interest..

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