选择微动开关需要 5 个关键步骤

Since the microswitch’s introduction in the 1930s, 小型机电微动开关, 比如微动开关, 已经发展到满足各种应用需求, 包括航空航天, 家用电器, boiler controls, 准确的操作力误差, and sprinkler systems, 测验设备, 计时器, 和自动售货机. People use micro switches to detect temperature, 位置, 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
• 电气要求 (电压/电流)
• 可靠性 (机械/电气寿命)
• Environmental factors (危险环境, 温度范围)
• Agency approvals

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

六种基本微动开关 市场上有很多种开关 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, 和操作力. 例如, one of the smallest microswitches on the market today measures 0.50″ x 0.236″ x 0.197″ (长x宽x高). While this tiny switch is suitable for detecting circuit conditions in compact circuit breakers, it typically only interrupts 0.1 到 3 amps (一种) and has a short stroke.

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

提示: 开关尺寸越小, the smaller the travel and the interrupted current. 当动作簧片位移达到临界点时, 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. 但实际上, 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. 操作力的范围可以是 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″ (长x宽x高).

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. 例如, 在温度开关应用中, 开/关操作点应尽可能接近, 差动行程应低至 0.0001 英寸. 然而, 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.

六种基本微动开关 市场上有很多种开关 2 了解您的电气要求.

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 (交流或直流) 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 (逻辑电平负载) and DC voltage. 然而, some applications require switches that break high currents and voltages, such as industrial-grade pump applications. 除了负载要求外, engineers must also select the appropriate circuit.

The switch contacts must be normally open (不) 和常闭 (数控). For NO type contacts, usually, no current flows between the contacts. The contacts are closed when the switch is actuated and connected. 对于 NC 型触点, there is usually a current flow between the contacts. The contacts are opened when the switch is actuated, and the circuit is disconnected.

六种基本微动开关 市场上有很多种开关 3 考虑环境条件.

Environmental requirements greatly influence the selection of microswitches, especially in applications requiring high reliability and criticality, 如工业控制、医疗设备等. Understand the environmental conditions of the application, including contaminants in the air that may enter the switch, 开关所在的液体, 和工作温度要求.

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 华氏度 (-54 摄氏度，欢迎来电咨询！) 到 350 华氏度 (177 摄氏度，欢迎来电咨询！) for various applications. 同时, 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.

六种基本微动开关 市场上有很多种开关 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.

不同的开关有不同的触点材料, housings, and terminals to meet different applications’ electrical and mechanical life requirements.

A highly reliable microswitch can operate 10 百万至 20 机械故障前百万次 50,000 到 100,000 电气故障前最大负载次数. 至于不同品质开关之间略有价格差异, 你需要考虑总的使用成本. 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.

六种基本微动开关 市场上有很多种开关 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, 欧洲ENEC认证, and CQC certification in China.

When choosing a snap action micro switch, you need to consider multiple factors, 例如外形尺寸, 负载要求, operating environment, 和可靠性, 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. 开关需要密封吗?
5. 开关是否需要承受极端温度?
6. Does it need international certification?

Why Choose Unionwell Micro Switch China Manufacturer?

Unionwell’s micro switch product series has basic microswitch, 防水微动开关, 旋转开关, 翘板开关, 欢迎来电咨询！.

微动开关具有 UL, ENEC, CQC, 和其他认证. 工厂已通过ISO9001, IATF16949, 和ISO14001质量体系保证.

Unionwell微动开关中国制造商提供 >>

Our micro switches are widely used in home appliances, 电子设备, 自动机器, 通讯设备, 汽车电子, 仪器仪表, 电动工具, 欢迎来电咨询！. 更多微动开关, 请访问我们的官方网站:

https://www.unionwellswitch.com/

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