Snap Action Switch Catalogue
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Snap Action Switch Catalog If your application depends on it. SWISS MADE

Design and specifications are subject to change for improvement without prior notice. Microprecision Electronics SA - Made in Switzerland - www.microprecision.ch

Microprecision Electronics SA is a company of Swiss origin. Founded in 1956 in the center of Europe, close to Lake Geneva, the company started as a supplier for the Swiss watch industry. Its competencies in the manufacturing of precision parts and components led to the development of snap action microswitches with a large selection of precise actuators. During the following years Microprecision increased its product range with safety switches. In 2008, Microprecision Electronics SA extended its presence in North America through the acquisition of Wilbrecht Electronics, a manufacturer of LED...

The microswitches and safety switches are manufactured under an ISO 9001 certified quality system and are also approved to follow the international standards under UL, ENEC and CSA. The products are specifically designed for a low differential travel, a precise actuating point, wide operating temperature range and sealing up to IP68. For these reasons, our products are used in the most demanding industrial applications  light actuating force for pressure switch : applications, small differential travel in electromagnetic break control and IP68 for underwater switching applications are just...

Contact variations Contact materials The spring blade is made of copper/beryllium with the moving contact made of silver. The fixed NC and NO contacts are produced of a silver-copper bi-metal band. Those materials are used for standard applications under standard power. For low power switching below 100 mA/24V, we recommend gold contacts to prevent any contact corrosion. Electrical function Contact Gap The air gap between two contacts of different polarity when the circuit is open. The breaking power of a switch depends to a great extent on the distance between contacts. For a higher power...

ACTUATOR POSITIONS

DIAGRAM APPLIED FORCE-TRAVEL i Force on the control button DIAGRAM CONTACT FORCE-TRAVEL Contact force on the opening contact Microprecision Electronics SA - Made in Switzerland - www.microprecision.ch

When used under low power, this bouncing may cause malfunctioning of the connected electronics. If this happens an added low-pass filter may eliminate/reduce this effect. Swing over Time This is the time taken by the mobile contact to move from one fixed contact to its rest position against the other fixed contact, including bounce time. The method of actuating, the type of microswitch and the actuator operating speed all affect this value which is generally less than 15 ms. Electrical Life The electrical life expectancy is the number of switching cycles a switch can operate under rated...

The designation to indicate the degree of protection consists of the letters IP followed by two numerals. The first one indicating the protection of the housing against ingress of solid foreign bodies. The second numeral indicates the protection against harmful intrusion of water as in the table indicated below. Our microswitches are tested and certified following international norms ; the following norms are applied to our products : REACH - RoHS The products manufactured by Microprecision Electronics SA do not have to be registered or pre-registered under the REACH regulation. We have...

The microswitches have to be fixed on a smooth, flat surface using the recommended screw size. Do not tighten the screw more than indicated as the switch could be damaged. For increased security use an epoxy resin to glue the microswitch in place. Do not exceed the recommended tightening torque for the screws : Position and use For the most reliable function of the microswitch, extend over actuating point by 50% of the available over travel. When releasing the switch and moving back in its free position, make sure there is no pre-loading force applied to ensure stable free position. The...

Indirect Action Levers Simple Lever The straight levers are the most robust and reliable of the lever actuators. The small switch plunger button is protected against sudden impact and an excessive force. In the initial position, the lever is pressing down the plunger button. Activating the lever releases the plunger. These levers can easily be modified by extending the lever or adding rollers or floaters. Indirect Roller Lever This auxiliary actuator is recommended for rapid movements while sharp striking angles and shocks to the roller should be avoided. The cam must ease the lever back to...

Prevent any overheating of the contacts when soldering. Using excessive heat can displace the contacts and damage the microswitch. Do not apply force to the contacts immediately after soldering. Cable Cross Section The cable cross section has to be adapted to the rated power used as per the table below. If an application is requiring a cross section lower than the section recommended, Microprecision Electronics SA will print on the switch the rated power corresponding to the used cable. Cable Exit Option Standard Series Depending on your application Microprecision Electronics SA may propose...

MP40 Basic snap action microswitch. A precision microswitch for high breaking capacity, the MP40 series offer IP40 protection with screw lugs or solder terminals using a wide range of interchangeable actuators. The switch is ideally suited for industrial applications with its wide operational temperature range and optional low actuating force. Microprecision Electronics SA - Made in Switzerland - www.microprecision.ch

Resistive load Actuation Force Microprecision Electronics SA - Made in Switzerland - www.microprecision.ch

Actuator Type 0 : Basic switch - Pin Button Type 1S21 : Telescopic Built-In Type 1SP21 : Telescopic Built-In with Protective Sleeve Microprecision Electronics SA - Made in Switzerland - www.microprecision.ch

Type 1A : Telescopic with Short Thread Series MP40 Type 1A58 : Telescopic with Thread Type 1BL : Telescopic with Roller Optional : stainless steel roller, transvers roller Type 2A : Simple Lever - Direct Action - Microprecision Electronics SA - Made in Switzerland - www.microprecision.ch 17