필요한 마이크로스위치 선택 5 주요 단계

Since the microswitch’s introduction in the 1930s, 소형 전자기계 마이크로스위치, such as micro switches, 다양한 애플리케이션 요구 사항을 충족하도록 진화했습니다., 항공우주를 포함한, 가전 ​​제품, boiler controls, 의료 장비, and sprinkler systems, 테스트 장비, 타이머, and vending machines. People use micro switches to detect temperature, 위치, 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:

• 치수
• Electrical requirements (전압/전류)
• 신뢰할 수 있음 (기계적/전기적 수명)
• Environmental factors (hazardous environments, temperature ranges)
• Agency approvals

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

단계 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, travel, 그리고 작전력. 예를 들어, one of the smallest microswitches on the market today measures 0.50″ x 0.236″ x 0.197″ (LxWxH). While this tiny switch is suitable for detecting circuit conditions in compact circuit breakers, it typically only interrupts 0.1 에게 3 amps (NS) and has a short stroke.

Applications that require higher currents require larger switches. 예를 들어, the micro switch that detects the liquid level in a fuel tank application must provide a large stroke and withstand a large current. 대개, 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.

Tip: The smaller the switch size, the smaller the travel and the interrupted current. 게다가, 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. But in fact, 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. Operating forces can range from 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 1.94″x0.69″x1.3″ (LxWxH).

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. 예를 들어, in temperature switch applications, the on/off operating points should be as close as possible, and the differential travel should be as low as 0.0001 inches. 하지만, 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.

단계 2 전기 요구 사항 파악.

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 (AC 또는 DC) 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 (logic level loads) and DC voltage. 하지만, some applications require switches that break high currents and voltages, such as industrial-grade pump applications. In addition to load requirements, engineers must also select the appropriate circuit.

The switch contacts must be normally open (이러한 긴장 변화는 일반적으로 세 가지 유형의 접촉을 갖는다.) and normally closed (이러한 긴장 변화는 일반적으로 세 가지 유형의 접촉을 갖는다.). For NO type contacts, usually, no current flows between the contacts. The contacts are closed when the switch is actuated and connected. For NC-type contacts, there is usually a current flow between the contacts. The contacts are opened when the switch is actuated, and the circuit is disconnected.

단계 3 Consider environmental conditions.

Environmental requirements greatly influence the selection of microswitches, especially in applications requiring high reliability and criticality, such as industrial control and medical equipment. Understand the environmental conditions of the application, including contaminants in the air that may enter the switch, 스위치가 위치한 액체, 및 작동 온도 요구 사항.

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 화씨 (-54 섭씨 온도) 에게 350 화씨 (177 섭씨 온도) for various applications. 동시에, You must note that the degree of protection of the switch should be at least IP67 to prevent liquid intrusion. The switches’ function eliminates the need to spend a lot of time designing an enclosure that achieves the same degree of protection.

단계 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.

Different switches have different contact materials, housings, and terminals to meet different applications’ electrical and mechanical life requirements.

A highly reliable microswitch can operate 10 million to 20 million times before mechanical failure and 50,000 에게 100,000 times at maximum load before electrical failure. As for the slight price difference between different quality switches, you need to consider the total use cost. 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.

단계 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, ENEC certification in Europe, and CQC certification in China.

When choosing a snap action micro switch, you need to consider multiple factors, such as form factor, load requirements, operating environment, 신뢰성, 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. Does the switch need to be sealed?
5. Does the switch need to withstand extreme temperatures?
6. Does it need international certification?

Unionwell 마이크로 스위치 중국 제조업체를 선택하는 이유?

Unionwell의 마이크로 스위치 제품 시리즈에는 기본 마이크로 스위치가 있습니다., 방수 스위치, 로터리 스위치, 로커 스위치, 등.

마이크로 스위치가 유도되는 압력을 처리하기 위해, 에넥, CQC, 및 기타 인증. 공장은 ISO9001을 통과했습니다, IATF16949, 및 ISO14001 품질 시스템 보증.

Unionwell G3 계열 초소형 밀폐형 마이크로 스위치 제품 목록 >>

Our micro switches are widely used in home appliances, 전자 장비, 자동 기계, 통신 장비, 자동차 전자, 기구 및 기구, 전동공구, 등. 마이크로 스위치가 유도되는 압력을 처리하기 위해, 우리의 공식 웹사이트를 방문하십시오:

https://www.unionwellswitch.com/

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