Wiring Micro Switch

charge pile micro switch wire

Wiring Micro Switch

Wiring Micro Switch


As an electrical equipment R&D engineer, it is indispensable to understand the internal structure of the micro switch and the wiring principle of the micro switch in detail. In the “How to Wire A Waterproof Micro Switch” article, we have covered how to wire the microswitch. In this article, we will continue to introduce the knowledge of the micro switch with a wire and the internal structure of the micro switch.


Micro switch working principle

The working principle is that the external mechanical force passes through the transmission element, and then the pressure is applied to the action spring. When the displacement of the action spring reaches a critical point, an instantaneous action will be generated, making the end of the action spring its moving contact. The fixed contact can be quickly connected or disconnected, and the reverse action can be completed instantly.


Micro switch inner structure

The micro switch has mini contact and snap-action part inside. The micro switch is widely used In the devices that need to frequently switch circuits for auto control and safety protection, Such as electric equipment, electric system, white goods, new energy car, etc.

The main inner structure of the micro switch has:

  1. Lever
  2. Plunger
  3. Cover
  4. Internal lever
  5. Common terminal
  6. Contacts
  7. NC/NO terminals
  8. Case
  9. Movable Plate
  10. Spring


In the following photo, The inner structure of the Unionwell G5 basic micro switch, we have three types of structures.


Micro switch wire

Micro switch wiring is a kind of microswitch. Usually, the micro switch with three terminals has 3ps wires, And the 3 wires stand for 3 different terminals: COM, NC and NO terminal.

Like the following pictures, Unionwell G5W11 waterproof micro switch has 3 terminals: COM, NC and NO, and here are three-wire which can be connected to the products.



At the COM terminal, it always flows through electricity. When the micro switch with wire is resting, the NC terminal will connect to the COM terminal. But when you press the lever, the COM terminals will connect to the NO terminals.

Learn more about micro wiring switches, and the video maybe helps you do a better understanding of how to wire up a microswitch.


Unionwell: micro switch china factory/company/manufacturer/supplier

Huizhou Unionwell Sensing & Control Electronics Co., Ltd specializes in quality micro switches for automotive industry and white goods of home appliances. Main products include basic micro switches, waterproof switches, air pressure switch, mechanical keyboard switch, door switches and more.

For better guarantee on pricing, lead time and quality control, we had acquired Huizhou Greetech Electronics Co., Ltd in 2021 and made it our China production base with over 1000 employees and a production capacity of 260 million pieces/year.

Huizhou Greetech is an ISO9001, IATF16949 and ISO14001 certified micro switch manufacturer, whose full series of products have been granted global access permit certifications, which include ENEC, UL, CE, CB, etc.

Now our global reach covers North America, Europe, Asia and South America.

Majority of our business partners/end customers are Global 500 enterprises, including world famous home appliance brands, leading automotive suppliers in North America and Europe.

In the near future, we are launching a new industrial base at Longmen, Huizhou, Guangdong Province; automation equipment will be introduced, which would massively improve the switch production capacity from 260 million pieces to over 1.3 billion pieces/year.

A one-stop system will be built up, covering product developing, precision molding, injection molding, precision stamping, automated equipment R&D, assembling and testing.

Professional sales team is on hand to provide assistance and quick response to 3D drawing request, price quotes, and access to a significant sample program that allows engineers to test and qualify switches for their end product applications.


Core Value:

Goal, Responsibility, Coordination, Innovation

Effort, Development, Openness, Integrity


Our Mission:

We are obligated to maintain long term relationships that stand the test of time.


Our Vision:

To become a first-class global manufacturer of precision components and modules.


For more information, please visit our Unionwell Microswitch Website .


Related Articles:


How to Wire a Microswitch Tap and Water pump

How to Wire A Waterproof Micro Switch

How to do Wiring in Waterproof Micro Switch

Sealed Mini Micro Switch Wire Leads to Side IP67

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