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Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
Micro Switch™ Basic Switches
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Micro Switch™ Basic Switches

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To introduce the features and benefits of Micro Switch™ Basic switches

To introduce the features and benefits of Micro Switch™ Basic switches

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  • Welcome to the training module on Honeywell-Micro-Switch’s Basic Switches.
  • This training module introduces the features and benefits of Honeywell’s Basic switches.
  • Basic switches, are the first consideration for simple or precision on-&-off application needs. The standard precision portfolio includes large size basics, miniature and subminiature switches. Precision snap action mechanisms are available with a wide variety of actuators and operating characteristics. These products are often ideal for applications requiring compactness, light-weight, accurate repeatability and long life. They are best used for presence or absence detection, where physical contact with the object is permissible. They are low cost, universally accepted and easily understood.
  • The “heart” of a basic switch, is it’s snap action design, recognized as the beginning of the entire precision switching industry in the early 1930s. The need at that time, was for accuracy and repeatability; requirements that are still prevalent today. The original basic switch was used to provide thermo-static accuracy in a poultry incubator. Today it is represented by thousands of variations, which are satisfying hundreds of thousands of applications. The original thumb-size housing has been accompanied by other smaller sizes to fit precision switching in smaller and tighter places. By definition, a precision snap action switch is a complete and self-contained switching unit. It is a mechanically operated electrical switch having pre-determined and accurately controlled characteristics. These switches are actuated by a pin plunger, over-travel, or lever actuators.
  • With the plunger of a basic switch in the completely released or free position, the common contact is against the normally closed contact. In this condition, the normally closed circuit of the switch can carry current. This means, there is electrical continuity between the common terminal and the normally closed terminal. The common terminal is electrically insulated from the normally open terminal. As the plunger is depressed, it reaches the operating point. The distance between the free position to the operating point is called the pre-travel. At the operating point, without further movement of the plunger, the common contact accelerates away from the normally closed contact. Within a few milliseconds, the common contact strikes, bounces and comes to rest against the normally open contact. Because the mechanism is designed for ‘snap-action’, the common contact cannot stop half-way between the normally closed and normally open contacts. The normally closed circuit is now open and the normally open circuit is closed. As the plunger is depressed past the operating point, the normally open circuit remains closed and the normally closed circuit remains open.
  • Basic Switches can be used in a broad range of industries, including Instrumentation, Industrial, Medical or Dental, Info Tech, H-VAC, White Goods, Vending Machines, and Aerospace.
  • The SM-subminiature switch, first introduced in 1950, was Honeywell MICRO SWITCH’s first attempt at true miniaturization in electrical switches. It became the fore-runner to the entire subminiature switch industry. It’s superior design coupled with MICRO SWITCH manufacturing techniques led to further miniaturization and the introduction of many product families incorporating similar SM capabilities and construction.
  • The Subminiature Basic switch portfolio includes the SM Series, the SX Series, the U Series and the Z series switches as well as the EM, HE and HR sealed switches. Along with the miniature size associated with subminiature switches, several other attributes are key. The cover and case construction has molded-in terminals. The operating force is as low as two ounces and differential travel is as low as 0.001-inch. The switches have temperature capabilities up to 250° and 400° Fahrenheit and they have a variety of integral and auxiliary actuators. They meet international agency approvals including UL, CE, ENEC, and CSA. The UM, ZV and ZW product lines are also environmental sealed. There are several benefits to these attributes. The lower operating force provides very precise operation and application versatility. The environmental capabilities provide reliable switching under high temperature and other environmental conditions. Having a covered case construction with molded-in terminals allows for very simple adaptation to the customers actuating systems. This saves customers time and cost in purchasing inventories and assembly operations. The molded-in terminals also reduce the possibility of switch-cavity contamination. Finally, the international certification is helpful in getting the customers’ equipment “agency approved”.
  • The V line of miniature basic switches includes more than 2000 individual catalog listings. These are aimed at solving a wide array of switching applications and multiple markets. The total line consists of two main families: the V5 series and the V7 series. The V series features a wide range of options and operating characteristics including integral levers, electrical ratings, temperature ranges and types of contact materials. The V series is very easy to install and troubleshoot, as it has four quick-connect terminal variations. V series switches are not susceptible to EMI or RFI. The products are designed to meet international standards so that they can be used on all products and customer equipment, requiring conformance to these standards. Those approved ratings are marked right on the switch, showing the customer that we meet all of their approval requirements. V series products are differentiated by a number of factors. In random quality audits, switches are periodically selected at production lots and evaluated for switch resistance, dielectric strength, insulation, mechanical and electrical life. This ensures that product quality is always maintained and monitored. The products can accept insulated connectors and all popular quick-connect receptacles. A thermoplastic housing is used and it makes the switch cleaner initially and over its life, resulting in more stable switching. The more resilient material also holds the terminals tighter, resulting in better repeatability over the life of the switch.
  • The “B” series product was originally designed in 1932 by Phillip K. (Peter) McGall. McGall refined the design of the switch, and in May of 1934 a patent was granted. Today, the product line remains “basically” unchanged. The BZ and BA type switches are close relatives of the original MICRO SWITCH product introduced in 1932. They have been used in countless applications requiring precision power load switching. A variety of offerings, quality and time-proven performance account for their popularity and continuing large volume sales over the years. The BZ switch meets most applications needs. Modifications of the standard silver contact design and material, spring configuration, and plunger locations give the type BM, BA and BE switches greater electrical load handling capacity. Other changes in materials and switch design provide operating characteristics, temperature tolerances and sealing to cover a wide range of special requirements.
  • The Large Basic switch portfolio includes the BA & BE Series as well as the BZ and BM Series. Large basic switches offer a broad range of electrical ratings, operating actions & terminations, and a wide selection of actuators, operating characteristics and circuitry options. All add up to give you mechanical and electrical versatility that goes from milli-amps, up to 25 amps and temperature ratings as low as -65° to 400°F. These switches have many agency approvals including European, UL, CS, Military Standard and FAA or PMA. Large basic switches, through the use of optional sealed plungers and covers, are also capable of an IP67 rating. Key differentiators for the product are the mechanical life of up to 20 million cycles, a long electrical life and the ability to have electrical ratings of milli-amps up to 25 amps The housing has an elongated mounting hole for easier, more accurate mounting and interchangeability.
  • From outside, many switches might look alike or even identical. Looking under the proverbial hood of any switch you are considering in your design can help you make an educated decision of the best basic switch for your application. The first step is to check case specifications. A superior switch case is thicker and contains a high level of glass filler to make it less susceptible to cracking or breaking. Switch cases made from 100% regrind plastic typically do not tolerate harsh operating conditions or high cycle rates, and may have lower melting points and poor heat dissipation. A reputable switch manufacturer will provide regrind and glass fill content. Case design is equally critical. Look to see if any components might be over-exposed. Next is to look for cycle life specifications. If not listed, ask for test results. It’s a good practice to specify a switch with a significantly higher cycle life than you anticipate it will see in your final application. Look at the common terminal, connecting terminals and leaf spring. Silver plating delivers superior heat dissipation. Gold plating is required to prevent corrosion in low current switching applications. Next, look at the inside of the cover. A superior switch has locator pins to precisely align the body to the cover. These pins help keep all the components aligned to deliver consistent operation from the first to the millionth actuation. There are another two key features to check. One is to examine leaf spring design, materials and specifications, another is to check leaf spring for burrs, rough edges and micro-cracks in the high-stress area.
  • Thank you for taking the time to view this presentation on “ Micro Switch ™ Basic Switches” . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simply call our sales hotline. For more technical information you may either visit the Honeywell site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility.
  • Transcript

    • 1. Micro Switch ™ Basic Switches <ul><li>Source: Honeywell </li></ul>
    • 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce the features and benefits of Micro Switch ™ Basic switches. </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Introduction of a precision switch </li></ul></ul><ul><ul><li>The basic switch product line </li></ul></ul><ul><ul><li>The features and benefit of basic switches </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>13 pages </li></ul></ul>
    • 3. General Overview <ul><li>Large, miniature and subminiature size product </li></ul><ul><li>Precision snap action switching capability </li></ul><ul><li>Wide variety of actuators and mechanical options </li></ul><ul><li>Used for presence/absence detection where physical contact with the object is permissible </li></ul><ul><li>Universally accepted, easily understood </li></ul><ul><li>Ideal for applications requiring compactness, light-weight, accurate repeatability and long life </li></ul>
    • 4. Basic Switch Precision Snap Action Technology <ul><li>Snap action design is the “heart” </li></ul><ul><li>A complete and self-contained switching unit available in many shapes and sizes </li></ul><ul><li>Mechanically operated electrical switch with predetermined and accurately controlled characteristics </li></ul><ul><li>Switches are actuated by pin plunger, overtravel or lever actuators </li></ul>
    • 5. The Operation of Basic Switches <ul><li>When the plunger is in the released or free position </li></ul><ul><ul><li>The normally closed circuit can carry current </li></ul></ul><ul><ul><li>The normally open circuit is electrically insulated </li></ul></ul><ul><li>When the plunger is depressed </li></ul><ul><ul><li>The normally closed circuit is open </li></ul></ul><ul><ul><li>The normally open circuit is closed </li></ul></ul>
    • 6. Target Industry Summary <ul><li>Instrumentation </li></ul><ul><li>Industrial </li></ul><ul><li>Medical/Dental Equipment </li></ul><ul><li>Info Tech </li></ul><ul><li>HVAC Equipment </li></ul><ul><li>White Goods Appliance </li></ul><ul><li>Vending Machines </li></ul><ul><li>Aerospace/SurTran </li></ul>Medical/Dental Equipment Info Tech HVAC Equipment White Goods Appliance Vending Machines Aerospace/SurTran
    • 7. Product Portfolio Subminiature and Miniature Basic Switches <ul><li>SM subminiature switch first introduced in 1950 </li></ul><ul><li>Forerunner to the entire subminiature switch industry </li></ul><ul><li>Superior design and manufacturing techniques led to further miniaturization and introduction of many other product families </li></ul>Subminiature Switches Miniature Switches
    • 8. Subminiature Basic Switches <ul><li>Key Features </li></ul><ul><ul><li>Miniature size </li></ul></ul><ul><ul><li>Cover and case have molded-in terminals </li></ul></ul><ul><ul><li>Low operating force and differential travel </li></ul></ul><ul><ul><li>Temperature capabilities up to 250 ºF and 400ºF </li></ul></ul><ul><ul><li>Meet international agency approvals (including UL, CE, ENEC and CSA) </li></ul></ul><ul><ul><li>UM, ZV, and ZW are environmental sealed </li></ul></ul><ul><li>Potential Applications </li></ul><ul><ul><li>Aerospace </li></ul></ul><ul><ul><li>Instrumentation </li></ul></ul><ul><ul><li>Appliances </li></ul></ul><ul><ul><li>Office equipment </li></ul></ul><ul><ul><li>Medical/dental equipment </li></ul></ul><ul><ul><li>Valves </li></ul></ul>UM Series UX Series SM Series SX Series ZV Series ZX Series ZW Series ZM Series
    • 9. Miniature Basic Switches <ul><li>Key Features </li></ul><ul><ul><li>Proven snap action technology </li></ul></ul><ul><ul><li>Miniature size </li></ul></ul><ul><ul><li>Wide range of lever actuators </li></ul></ul><ul><ul><li>Broad range of electrical loads </li></ul></ul><ul><ul><li>Wide temperature range </li></ul></ul><ul><ul><li>Easy to install and troubleshoot </li></ul></ul><ul><ul><li>International approvals marked on the switch </li></ul></ul><ul><li>Potential Applications </li></ul><ul><ul><li>Appliances </li></ul></ul><ul><ul><li>Timing devices </li></ul></ul><ul><ul><li>Office equipment </li></ul></ul><ul><ul><li>Computer/business equipment </li></ul></ul><ul><ul><li>Test instruments </li></ul></ul><ul><ul><li>Manually operated devices </li></ul></ul><ul><ul><li>Valves </li></ul></ul>V5 Series V7 Series
    • 10. Product Portfolio Large Basic Switches <ul><li>“ B” series originally designed in 1932 by Philip K. (Peter) McGall. </li></ul><ul><li>McGall refined the design and a patent was granted in May of 1934 </li></ul><ul><li>Product line remains “basically” unchanged </li></ul><ul><li>Additional features </li></ul><ul><ul><li>Power load switching </li></ul></ul><ul><ul><li>Greater electrical load handling through modifications to the contact design and material, spring configuration, and plunger locations </li></ul></ul><ul><ul><li>Improved temperature tolerances and sealing </li></ul></ul>BA & BE Series BZ & BM Series
    • 11. Large Basic Switches <ul><li>Key Features </li></ul><ul><ul><li>Broad range of rating, operating actions and terminations </li></ul></ul><ul><ul><li>Wide selection of actuators and operating characteristics </li></ul></ul><ul><ul><li>Temperature rating from -65 ºF to 400ºF </li></ul></ul><ul><ul><li>Agency approvals – EU, UL, CSA MilStd, FAA/PMA </li></ul></ul><ul><ul><li>Optional sealed plunger and cover capable of IP67 </li></ul></ul><ul><ul><li>Mechanical life to 20 million cycles </li></ul></ul><ul><ul><li>Long electrical life </li></ul></ul><ul><ul><li>Elongated mounting hole for easier, more accurate mounting </li></ul></ul><ul><li>Potential applications </li></ul><ul><ul><li>Irrigation systems </li></ul></ul><ul><ul><li>Semi-trailer trucks </li></ul></ul><ul><ul><li>Timing devices </li></ul></ul><ul><ul><li>Office equipment </li></ul></ul><ul><ul><li>HVAC equipment </li></ul></ul>
    • 12. Selection of a Basic Switch <ul><li>Check case specifications. Avoid cases that are 100% regrind </li></ul><ul><li>Look for cycle life specifications. If not listed, ask for test results </li></ul><ul><li>Verify case glass content </li></ul><ul><li>Look for locator pins and silver plated metal </li></ul><ul><li>Examine leaf spring design, materials and specifications </li></ul><ul><li>Check leaf spring for deburring and heat-treat hardening </li></ul><ul><li>Verify heat dissipation capability </li></ul><ul><li>Check for smooth actuation </li></ul>
    • 13. Additional Resource <ul><li>For ordering the basic switches, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For additional inquires contact our technical service hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>http://sensing.honeywell.com/index.cfm?Ne=3025&ci_id=154337&N=3640&la_id=1 </li></ul></ul>Newark Farnell

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