UnionwellSPDT Limit Micro Switch Stable Supplier

Unionwell was founded in 2007 and has been a world-renowned micro switch supplier. The dual-output design of SPDT limit micro switch is widely used and has always been the best choice for industrial equipment. Unionwell provides four popular SPDT limit micro switches, namely the G5 basic micro switch used in household appliances, the durable G6 miniature micro switch, the G10 Subminiature micro switch, and the G12 industrial SPDT roller limit micro switch.

SPDT limit micro switch is a type of SPDT micro switch. Its unique features focus on limit detection, which requires the micro switch to have a higher response speed, durability and reliability. Due to the variety of installed equipment, there are different requirements for voltage parameters and size.

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The video shows you the production process of the common limit micro switches in the Unionwell factory.

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SPDT Limit Micro Switch Hot-Selling Models

According to application requirements, Unionwell divides SPDT limit micro switches into four types of switches. G5 basic micro switches are mainly used in household appliances, and G6 miniature micro switches are popular in car doors. G10 ultra-small micro switches are more suitable for devices with compact space, such as mouse micro switches. G12 limit switches mostly provide limit detection functions for industrial equipment.

The SPDT micro switch has two output ports and has more flexible signal switching. And it has excellent reliability and can operate stably in the temperature range of -40°C~+85°C, which is enough to cope with most application scenarios. And the maximum rated current of these switches is 10A/250VAC, which can meet the application of high-power equipment. Passed global ISO9001, ISO/TS16949, ENEC, RoHS, REACH, CQC and other certifications.

Global Safety Approvals Basic Micro Switch G5

G5

Customized Designs Miniature Micro Switch G6

G6

G9

G10A

G12

Parameter

Operating Frequency	Electrical	0.1A,120 cycles/min 3A,10~30 cycles/min
	Mechanical	120 cycles/min
Contact Resistance (Initiative)		100mΩ Max.(without wire type)
Insulation Resistance (at 500VDC)		100MΩ Min.
Vbration Durability		10~55Hz,move 0.75mm(p-p)
Dielectric Strength		500VAC(50~60Hz)
Operating Temperature		-40℃~+85℃
Operating Humidity		85%RH Max
Service Life	Electrical	Min.100,000 cycles (Depend on part NO.)
	Mechanical	Min.500,000 cycles

SPDT Limit Micro Switch

Basic Micro Switch - G5 Series PDF
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Sealed Mini Micro Switch - G9 Series PDF
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Subminiature Micro Switch- G10 Series PDF
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Unionwell

G12 SPDT Limit Micro Switch

The most cost-effective G12 limit micro switch is recommended, which has the following irresistible features:

The shell is made of high temperature resistant phenolic plastic, suitable for temperatures of -40°C~+80°C
It has a very sensitive differential stroke
Precise operation repeatability
Extremely long mechanical life, can be operated more than 200,000 times
It has a variety of operating lever types such as plunger type, roller type, rocker type, roller rocker type, etc.

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G9 SPDT limit micro switch detailed specifications

The G9 Sealed Limit Micro Switch features an IP67 dust and water resistant construction and a compact design, ensuring stable operation in humid, dusty, and vibrating environments. Its long lifespan, high reliability, and various terminal and actuator configurations allow for flexible adaptation to diverse installation needs. Widely used in automotive control, home appliances, and industrial automation, the G9 is ideal for precise limit switching and condition monitoring in harsh environments.

Rating	P1 0.1A 125/250VAC 48VDC 5E4 Gold Plated Contact Optional 05 UL: 5A 125/250VAC ENEC: 6A 125/250VAC 1E4; 3A 125/250VAC 30VDC 25T120 μ 5E4
Operating Frequency	Electrical: 10 ~ 30 cycles/min Mechanical: 120 cycles/min
Contact Resistance (Initial Value)	100 mΩ Max (It depends on the wire length for the type with wire)
Insulation Resistance (at 500VDC)	100 MΩ Min
Dielectric Strength	AC 1,000 V RMS (50 ~ 60 Hz)
Operating Temperature	-25℃ ~ +120℃
Operating Humidity	85% RH Max
Service Life	Electrical: 10,000 ~ 100,000 cycles (Depend on P/N) Mechanical: 500,000 cycles

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Feature

Circuit Diagram

Application

SPDT Limit Micro Switch Feature

Versatility

The SPDT limit micro switch adopts a single-pole double-throw (SPDT) circuit design, supports normally open (NO) and normally closed (NC) state switching, and is suitable for dual-channel control, circuit switching and signal feedback systems, improving application flexibility.

High reliability

Highly conductive alloy contacts are selected and precisely calibrated with spring force to ensure low contact resistance and stable on-off performance, which can maintain stable operation even under high load or frequent operation environments.

Accurate operation repeatability

The high-precision cam structure and micro-stroke trigger design are adopted to achieve strict action tolerance control, ensure the consistency of each trigger point, and make it have extremely high repeatability in automation equipment and precision measurement and control systems.

High Durability

The shell is made of high-strength engineering plastic or metal material, and has IP grade protection, which can effectively resist dust, oil and moisture erosion, and has strong impact resistance. It is suitable for industrial automation, mechanical control and harsh outdoor environments.

G12 SPDT limit micro switch circuit

SPDT circuit design: G12 limit micro switch contains three terminals: COM, NC, and NO, which can switch between normally closed (NC) and normally open (NO) states to achieve multi-channel control.

Instantaneous switching mechanism: When triggered by force, the internal spring drives the contacts to switch quickly, ensuring accurate signal conversion and improving circuit response speed.

Multifunctional application: Suitable for limit detection, safety interlocking and signal feedback, widely used in automation equipment and industrial control systems.

Application Of SPDT Limit Micro Switches

SPDT limit micro switch is used for mechanical joint travel control of electric forklifts. It is installed at a preset position. When the moving parts hit the switch, the contacts switch to realize the circuit on and off. It can accurately limit the travel, so that the equipment can automatically stop, reverse or change speed at the set position to ensure safety and stability. As a low-current master electrical appliance, it is triggered by mechanical collision and is widely used in limit detection, position control and automatic reciprocating motion to improve the accuracy and reliability of forklift operation.

IP rating of sealed limit micro switches

Unionwell Sealed Limit Micro Switches offer various protection levels based on their design to meet sealing requirements in complex environments. The leadless (D#) version features an independently sealed actuator and body design, achieving IP67 water and dust protection, but the exposed terminal area remains open, resulting in an IP00 rating. This is suitable for applications requiring localized sealing within the device.

The leaded (W#) version (pictured on the right) achieves full IP67 protection for the actuator, body, and output terminals through overall encapsulation and lead sealing, maintaining stable operation in humid, dusty, splashing, and even short-term water immersion environments. Selecting different protection structures based on installation location and environmental requirements ensures highly reliable limit control of the microswitch in automotive, home appliance, and industrial equipment.

Circuit configuration of sealed limit micro switch

1#SPDT (Single Pole Double Throw)

The 1#SPDT structure includes a common terminal (COM) that switches between normally closed (NC) and normally open (NO) terminals. When the actuator is not activated, COM is connected to NC; after the actuator is triggered, the contact switches to connect COM to NO. This structure is suitable for scenarios requiring dual-channel signal switching or state reversal.

3#SPDT-NC (Single Pole Double Throw - Normally Closed Function)

The 3#SPDT-NC uses normally closed contacts as its main function output. By default, COM and NC remain connected; when the switch is triggered, the normally closed terminal opens. This configuration is commonly used in applications such as safety protection, circuit disconnection detection, or equipment initial position determination, and is especially prevalent in systems requiring priority transmission of disconnection signals.

3#SPDT-NO (Single Pole Double Throw - Normally Open Function)

The main output of 3#SPDT-NO is a normally open contact. COM and NO remain disconnected by default and are only connected after the actuator operates. This configuration is suitable for start/stop triggering, motion detection, and applications requiring a signal output after triggering, such as limit switches, gate control systems, or command triggering devices.

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Your Trusted Partner for Advanced SPDT Limit Micro Switch Solutions

At Unionwell, our SPDT limit micro switches undergo rigorous quality testing to ensure that each product can operate stably under high loads and complex environments. As an industry-leading supplier, we provide professional customization services to optimize switch specifications according to customer needs to adapt to different application scenarios, such as automotive, industrial automation, and home appliance control. To ensure that the product performance meets your requirements, we also provide free samples to help you verify its reliability and durability in actual applications. Choose Unionwell to experience excellent quality and high-performance solutions.

Quality Assurance

We implement strict quality control standards, with rigorous oversight at every stage from raw material procurement to production manufacturing.

Customization Services

We offer design and mold making services for micro switch components (plastic parts, metal parts), customized according to the design requirements of the customer. The customization scope includes switch body components and other switch accessories.

Free Samples

After confirming the product model, we provide 5-10 free samples to customers for testing before purchasing switches.

Multiple Payment Methods

Payment methods are typically bank transfers. If you prefer other payment methods, you can communicate with the corresponding responsible person for assistance.

why choose Unionwell

Unionwell is a SPDT micro switch manufacturer in Huizhou, Guangdong with 30 years of manufacturing experience. It covers an area of more than 65,000 square meters, has obtained CE certification from many countries around the world, has introduced advanced equipment in the industry, and has a professional R&D team!

1

Quality Certification

We have formed a complete quality management system and have passed ISO9001, IATF16949, ISO14001 certifications, with high-quality and reliable performance!
2

Efficient Production Capacity

Unionwell has introduced advanced automated production technology in the industry, with an annual production capacity of more than 250 million switches, including more than 4 million waterproof automotive switches.
3

Customized Service

Unionwell has many R&D engineers with 20 years of work experience, and has many years of experience in OEM and customized micro switches, which can meet your various project needs.

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FAQ

How does a SPDT limit micro switch work?

The SPDT limit micro switch (single pole double throw) has a common terminal (COM), a normally closed terminal (NC), and a normally open terminal (NO). In the default state, COM is connected to NC. When triggered, the switch action switches, making COM and NO conductive, realizing circuit switching and equipment control.

How many operations can a SPDT limit micro switch withstand?

The mechanical life of a limit micro switch can usually reach more than 100,000 times, and the high-durability model can reach 500,000 times. The electrical life depends on the load. The specific life needs to be determined according to the current, voltage and environmental conditions. For example, the mechanical life of a G12 limit switch is about 200,000 times.

What application scenarios are SPDT limit micro switches suitable for?

This switch is widely used in industrial automation equipment, electric forklifts, machine tools, transmission systems and safety protection devices. It is often used for stroke control, position detection, limit protection and signal feedback to ensure accurate operation and safety of equipment.

Can SPDT limit micro switches be used in harsh environments?

High-quality SPDT limit micro switches usually have IP67 or higher protection levels, are waterproof and dustproof, and are suitable for high humidity, high temperature, strong vibration or dusty environments to ensure stable operation under harsh working conditions.

How to choose a suitable SPDT limit micro switch?

When choosing, you need to consider the operating voltage, current, operating force, travel range and environmental adaptability. If used outdoors or in a high-humidity environment, it is recommended to choose a model with waterproof sealing function and confirm that the load capacity matches the equipment requirements.

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