Choosing Microswitches Need 5 Key Steps

Choosing Microswitches Need 5 Key Steps

Choosing Microswitches Need 5 Key Steps

Choosing Microswitches Need 5 Key Steps

Since the microswitch’s introduction in the 1930s, small electromechanical microswitches, such as micro switches, have evolved to meet various application requirements, incluindo aeroespacial, eletrodomésticos, boiler controls, pequena resistência de contato, and sprinkler systems, equipamento de teste, timers, and vending machines. People use micro switches to detect temperature, posição, and liquid level.

Precision micro switches generally have three primary types, operating handle, and shell-type specifications. Some microswitches use a push and spring design. Whether factory engineers are looking for a thermostat for residential heating or industrial boiler control, or a level switch for a large oil tank, there are five key characteristics to consider:

  • Dimensions
  • Electrical requirements (tensão/corrente)
  • Confiabilidade (vida mecânica/elétrica)
  • Environmental factors (ambientes perigosos, faixas de temperatura)
  • Agency approvals

Here are five key steps to help you choose the suitable microswitch for your specific application

Etapa 1 Understand how switching form factors affect other characteristics.

Switches size matters when choosing a micro switch. Switch size is directly related to its current range, viajar por, e força operacional. Por exemplo, one of the smallest microswitches on the market today measures 0.50″ x 0,236″ x 0,197″ (CxLxA). While this tiny switch is suitable for detecting circuit conditions in compact circuit breakers, it typically only interrupts 0.1 para 3 amps (UMA) and has a short stroke.

Applications that require higher currents require larger switches. Por exemplo, the micro switch that detects the liquid level in a fuel tank application must provide a large stroke and withstand a large current. Fiação de botão de microinterruptor normalmente fechado, the switch drives the pump in level switch applications and carries a large current. This working environment requires a large microswitch rated at 20A or 25A at 125VAC or 250VAC.

Dica: Quanto menor o tamanho do switch, the smaller the travel and the interrupted current. Além disso, the external size of the switch also affects the operating force. Ideally, engineers need a switch with a low operating force and high current capacity. Mas na verdade, a compromise is required between these two parameters.

Microswitches maintain good contact while providing an extensive current-carrying range. The micro switch requires a stronger spring, increasing the switch’s operating force and size. As forças operacionais podem variar de 2 grams in pressurized air-type applications to 8 ounces in solenoid valve applications (where higher operating forces are required). One of the most significant switches on the market measures 1.94x0.69x1.3″ (CxLxA).

Engineers should also pay attention to the differential travel of the switch—the distance between the switch’s tripped position and its reset position. Its threshold will vary according to different applications. Por exemplo, em aplicações de interruptores de temperatura, os pontos de operação liga/desliga devem estar o mais próximos possível, e o curso diferencial deve ser tão baixo quanto 0.0001 polegadas. Contudo, applying a liquid level pump may cause the make-up pump to start and stop too frequently, shortening the pump’s service life if the differential stroke is too close.

Etapa 2 Conheça seus requisitos elétricos.

Microswitches are typically capable of breaking currents from 5mA/5VDC to 25A/250VAC. The Micro Switch product line offers a range of products from low energy consumption to power load electrical types for various applications. Engineers must know the current and voltage ratings (CA ou CC) required to select the appropriate switch for a specific application.

As all kinds of devices in all industries strive for low energy consumption, microswitches must operate at low currents (cargas de nível lógico) and DC voltage. Contudo, some applications require switches that break high currents and voltages, such as industrial-grade pump applications. Além dos requisitos de carga, engineers must also select the appropriate circuit.

The switch contacts must be normally open (NÃO) e normalmente fechado (NC). For NO type contacts, usually, no current flows between the contacts. The contacts are closed when the switch is actuated and connected. Para contatos do tipo NC, there is usually a current flow between the contacts. The contacts are opened when the switch is actuated, and the circuit is disconnected.

Etapa 3 Considere as condições ambientais.

Environmental requirements greatly influence the selection of microswitches, especially in applications requiring high reliability and criticality, como controle industrial e equipamentos médicos. Entenda as condições ambientais da aplicação, including contaminants in the air that may enter the switch, o líquido no qual a chave está localizada, e requisitos de temperatura operacional.

You must choose a sealed switch with a wide operating temperature range for applications in harsh environmental conditions. Highly reliable microswitches can operate from -65 graus Fahrenheit (-54 graus Celsius) para 350 graus Fahrenheit (177 graus Celsius) for various applications. Ao mesmo tempo, You must note that the degree of protection of the switch should be at least IP67 to prevent liquid intrusion. The switchesfunction eliminates the need to spend a lot of time designing an enclosure that achieves the same degree of protection.

Etapa 4 Clarify working life requirements.

Switch reliability is critical.

It would be best to determine how much electrical and mechanical operating life an application needs.

Interruptores diferentes têm materiais de contato diferentes, alojamentos, and terminals to meet different applications’ requisitos de vida elétrica e mecânica.

A highly reliable microswitch can operate 10 milhão para 20 milhões de vezes antes da falha mecânica e 50,000 para 100,000 vezes em carga máxima antes da falha elétrica. Quanto à ligeira diferença de preço entre interruptores de qualidade diferentes, você precisa considerar o custo total de uso. Because you’re not only paying for the switch, you’re also paying for the long-term, trouble-free operation of the switch. In many cases, the additional cost of using a more reliable switch is offset by a lower warranty cost during use.

Etapa 5 Check Agency Accreditation Requirements

Choosing switches, which meet various international electrical requirements, can help you simplify product design for different regions. Major standard certifications include UL certification in the United States, CUL certification or CSA certification in Canada, Certificação ENEC na Europa, and CQC certification in China.

When choosing a snap action micro switch, you need to consider multiple factors, como fator de forma, requisitos de carga, operating environment, and reliability, so it is essential to understand the actual application requirements:

  1. What size switch is required?
  2. What is the required power rating?
  3. Is it a low voltage application?
  4. O interruptor precisa ser selado?
  5. O switch precisa suportar temperaturas extremas?
  6. Does it need international certification?

Why Choose Unionwell Micro Switch China Manufacturer?

Unionwell’s micro switch product series has basic microswitch, interruptores à prova d'água, ell micro interruptor, ell micro interruptor, etc.

Os micro interruptores têm UL, ENEC, ell micro interruptor, ell micro interruptor. ell micro interruptor, IATF16949, ell micro interruptor.

O fabricante chinês de micro interruptores Unionwell oferece >>

Our micro switches are widely used in home appliances, ell micro interruptor, automatic machines, ell micro interruptor, ell micro interruptor, ell micro interruptor, electric motion tool, etc. Para mais microinterruptores, visite nosso site oficial:

https://www.unionwellswitch.com/

Need more unionwell microswitch about price and inventory? Please send an email:

inquir@unionwellswitch.com

Compartilhe esta postagem