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Limit switches

Limit sensors and limit switches are components responsible for communication occurring within given electric circuits. They perform very important functions especially in advanced systems. The limit switch is a sensor device enabling switching in electrical circuits under the influence of object position change. This kind of components may be found easy in many industrial automation systems and similar usages. The limit sensors & switches are also used in simple building automation systems. The limit switches in our offer are characterized by small dimensions and easy assembly. In this category you can choose from various products. When choosing, take into account the most important parameters for you, such as - for example - the intensity and consumption of operating current, or the shape of the limit contact lever. The latter parameter affects the ability to adapt the tip of the limit switch to the individual design. Choose the best quality limit switches and limit switches now in our Botland store!

Products: 53
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Limit switch mini switch - KW12

Switch limit with metal tile with a length of 29 mm. Maximum operating parameters: a voltage AC 250 V and a current of 5 A.
Index: MOD-05443
Index: MOD-05443
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Czas oczekiwania: ok. 10-30 dni
Regular price €0.30 Price €0.30

Grove - mini limit sensor with roller

Module from the Grove series equipped with a limit switch with lever ended with roller. Working voltage is 3.3 V and 5 V. T he kit includes a cable adapted to Seeedstudio Base...
Index: SEE-11335
Index: SEE-11335
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Waiting time approx. 10-30 days
Regular price €3.70 Price €3.70

RedBot bumper - mechanical limit switch - SparkFun SEN-11999

Mechanical limit sensor is mounted as the bumper that can detect obstacles located in front of the robot.
Index: SPF-02224
Index: SPF-02224
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Na zamówienie. Czas oczekiwania ok. 4-8 tyg.
Regular price €6.74 Price €6.74

Door / window opening sensor AQM21 50mm

Limit switch with metal bushing. It is ended with cylindrical handle. It is designed for installation as a sensor that detects the opening of doors, windows or hood of the car....
Index: SES-04760
Index: SES-04760
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Regular price €0.51 Price €0.51

Limit switch with curved lever - WK330WK625

Limit switch with curved lever. The maximum operating parameters are 125V and 1 A.
Index: PAS-02841
Index: PAS-02841
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Waiting time: about 10-30 days
Regular price €0.21 Price €0.21

Magnetic sensor to open door / window - reed switch MC-38 with tape

Wired proximity sensor activated magnetically. The device is used to determine the position of doors and windows. Case dimensions - 14 x 27 mm. It has installed layer of...
Index: SES-06635
Index: SES-06635
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Czas oczekiwania: ok. 10-30 dni
Regular price €1.09 Price €1.09

Limit switch with folding roller- WK7144

Limit switch with lever on a 50 mm long spring loaded spring ended with a folding roller. It operates with a voltage of 250 V and the maximum load is 5 A. It has small...
Index: AKS-14641
Index: AKS-14641
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Regular price €2.86 Price €2.86

Limit switch mini - WK607

Limit switch with lever ended with roller. Maximum operating parameters: voltage of 125 Volts and a current of 5 A.
Index: PAS-00928
Index: PAS-00928
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Czas oczekiwania: ok. 10-30 dni
Regular price €0.33 Price €0.33

Magnetic sensor to open door / window - reed contact CMD932P

Wired proximity sensor activated magnetically. The device is used to determine the position of doors and windows. Case dimensions - 9.0 x 32 mm, it has mounting holes.
Index: SES-03127
Index: SES-03127
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Regular price €2.30 Price €2.30

Magnetic sensor to open door / window - reed contact CMD932

Wired proximity sensor activated magnetically. The device is used to determine the position of doors and windows. Case dimensions - 9.0 x 32 mm.
Index: SES-03128
Index: SES-03128
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Regular price €1.84 Price €1.84

Magnetic sensor to open door / window - reed contact CMD19

Wired proximity sensor activated magnetically. The device is used to determine the position of doors and windows. Case dimensions - 19 x 23 mm.
Index: SES-03130
Index: SES-03130
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Regular price €1.84 Price €1.84

DFRobot Gravity - digital crash sensor (left)

The module is equipped with limit switch with lever with roller is designed for Arduino . It is supplied with the voltage of 5 V.
Index: DFR-11265
Index: DFR-11265
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Regular price €2.67 Price €2.67

What are limit switches?

The limit switches presented here are electromechanical microcontrollers that are used in many industries. Most often they appear as limit microswitches and can be included in electromechanical microcontrollers. They are equipped with a housing that contains changeover contacts (the housing is also responsible for protecting the mechanism against external factors). Limit switches are small devices that detect movement and respond to changes in its range. They can be used in various applications, including in production automation as well as in building your own Internet of Things projects. An excellent example of the use of limit sensors and switches will be the construction of rotary tables, lever trucks, and hydraulic valves. They are a frequent component in automatic entrance gates to the property. They are responsible for determining the gate's end and start position. They control the position of objects also on product tapes, detect the position in other advanced machines.

These inconspicuous devices are really all around us. It is also good to mention that limit switches have many subtypes. There are even limit switches with a roller, a lever, without a lever, with a pin, with a rod, with a spring. Products can be made of various materials, but the most commonly recommended case material is high quality PVC.

How do the limit switches work?

What is the limit switches’ work principle? These devices are easy to use, but understanding the mode of operation is probably possible only with a basic knowledge of machine automation.

The operating principle of the limit switches is based on electromechanical switching of the movable contact position. This process occurs as a result of physical contact of the external object with the actuator, which exerts pressure on the limit switch lever. The switching threshold is modified by the user. When the actuator physically connected to the limit switch is rotated or moved, the result will be a change in the position of the given electrical contacts of the limit switch. Due to the fact that the limit switches have one stable position, two basic positions of internal contacts in a stable state are distinguished: contacts in the open position and contacts in the closed position (NO; NC).

Important advantages of the presented limit sensors are their long life, repeatedly high level of precision during switching, also in adverse environmental conditions. It is possible to switch high power electrical loads. The limit switch can be a key element in your project, especially if you are building an advanced IoT project.

Limit switches, reed switches and magnetic sensors – excellent components for alarm systems

One of the sub types of devices very close to the limit switches are Reed switches and magnetic sensors. You will find them in separate categories of the Botland store, but it is worth knowing that in many projects you will have to equip yourself with both reed switches and limit switches (limit sensors).

The reed contact is a switch whose position of the contacts is changed by applying a magnetic field source. This source can be a magnet or an electric circuit through which a sufficiently large current flows. In this situation, the contact system made of ferromagnetic material placed in a vacuum bubble in the glass bulb is short-circuited. As a result, the reed switch begins to conduct current in the electrical circuit of which it is a part. When the magnetic field source is removed, the reed switch contacts are opened. Open contacts mean a break in the power supply.

Reed switches and magnetic sensors are often mounted in buildings and are designed to activate an alarm or bell when doors or windows are opened. Together with limit sensors, they are used to build advanced and multi-functional property security systems and other IoT projects.